巻号一覧
33 巻, 7 号
選択された号の論文の23件中1～23を表示しています
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井上 潔, 島 好範1969 年 33 巻 7 号 p. 755-760
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe purpose of this paper is to clarify the character of spark carburization for iron, and characteristics of the spark carburized layer which is not found in other carburizing treatments, and also to investigate the effect of superposing magnetic field and high frequency current. Through microscope and by X-ray diffraction, the following conclusions have been drawn:
(1) Glycerine-25% Potassium acetate is extremely excellent for the carburizing solution, and the caburized layer of 0.2∼0.5 mm can be obtained by 5∼10 min carburization.
(2) As for the structure of the carburized quenching layer, the surface shows structure including carbide, residual austenite and martensite, and moreover the inner part shows a martensite structure like fine needles. This is because the surface layer contains a large amount of carbon, and from this it can be estimated that the mechanical properties, especially wear resistance, is excellent.
(3) In the carburization the high frequency current has the effect of unifying diffusion. In this case, the frequency of 350 KHz is effective. The magnetic field has the effect of increasing the carburizing ability by 50∼80% on the surface in parallel with the magnetic flux.抄録全体を表示PDF形式でダウンロード (2235K) -
飛田 守孝, 幸田 成康1969 年 33 巻 7 号 p. 761-765
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーElectrical resistivity of Cu-Ge alloys containing 1∼9 at%Ge has been measured after tensile deformation at −195°C. This work deals with (i) the effects of stacking faults introduced by the deformation on the electrical resistivity and mechanical properties, (ii) the effect of short-range clustering or ordering on the composition dependence of the observed results and (iii) the measurement of vapor pressure of Ge as a function of Ge contents. The experimental results are as follows:
(1) On the high concentration side (≥7.02 at%Ge), the resistivity increment by tensil deformation is largely due to the formation of stacking faults. The resistivity change due to a stacking fault (ρst⁄β) was estimated to be 1.2×10−11 Ω-cm2. On the low concentration side (≤4.41 at%Ge), the increment by stacking faults is relatively small.
(2) Vacancies play a role in short-range clustering and segregation of the solutes to dislocations during deformation even at −195°C, since the migration energy of vacancy is evaluated to be about 0.24 eV from repeated yielding phenomena of Cu-4.41 at%Ge alloys.
(3) Cu-Ge solid solution alloys are poorer in the tendency of the formation of internal microstructure (short-range order, short-range cluster, etc.) than Cu-Al and Cu-Ni solid solution alloys.
(4) The activity of Ge atoms in Cu-Ge solid solution alloys seems to positively deviate from the Raoult’s law on the low concentration region up to about 10 at%Ge.抄録全体を表示PDF形式でダウンロード (2053K) -
飛田 守孝, 幸田 成康1969 年 33 巻 7 号 p. 766-771
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn a previous paper, the authors have expected from electrical resistivity changes of the deformed or quenched Cu-Ge alloys that anneal-hardening might not occur in Cu-Ge solid solutions.
In this paper, (i) it was ascertained that the anneal-hardening did not occur in the Cu-Ge alloys, but it occurred in Cu-Al alloys. (ii) In order to make clear the origin of anneal-hardening, the flow-stress and the resistivity change by plastic deformation at room temperature are measured for Cu-Ge, Cu-Al and Cu-Ni alloys, and the X-ray (111) and (200) peak shifts by low temperature annealing were investigated in addition to Vickers hardeness measurment. (iii) The cause of anneal-hardening introducing wipe-out number was discussed. The results obtained are as follows:
(1) The anneal-hardening does not occur in Cu-Ge and Cu-20.77 at%Ni solid solutions, but it is observed in a Cu-10.37 at%Al alloy.
(2) The specific resistivity change Δρ⁄ρ0 by cold work and the work hardening of Cu-Al alloys are larger than those of Cu-Ge alloys.
(3) The isothermal annealing curve of the X-ray (111) and (200) peak shift difference of Cu-10.37 at%Al alloy has two steps corresponding to the isothermal anneal hardening.
(4) The smaller the wipe-out number of solute atom, the easier solute atoms may form a kind of fine ordered lattice structure. The anneal-hardening may be attributed to the formation of the ordered lattice structure rather than the segregation of solute atoms at the stacking faults.抄録全体を表示PDF形式でダウンロード (1610K) -
堀 真市1969 年 33 巻 7 号 p. 772-775
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe Cu-Al-Be-3.5Fe alloys quenched in water from 900°C were investigated in relation to the crystal structures, wear resistances and compositions. The wear test was performed by a rolling contact machine at a sliding speed of 7.85 cm/sec under different loads. The results were:
(1) The crystal structures of the quenched Cu-12Al-(0.6∼1.0)Be-3.5Fe alloys were β1 and the wear resistances for the same alloy and the normalized 0.6%C steel at loads 25∼200 kg were better than the quenched Cu-13Al-3.5Fe alloy.
(2) The quenched Cu-12Al-(0.6∼1.0)Be-3.5Fe alloys of high wear resistivity show mirror oxidized wear, but the quenched Cu-13Al-3.5Fe alloy shows pear adhesive wear for the same alloy and the normalized 0.6%C steel under loads 25∼200 kg.抄録全体を表示PDF形式でダウンロード (1118K) -
吉田 博行, 村上 陽太郎1969 年 33 巻 7 号 p. 775-781
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe post-irradiation aging characteristics of copper-9.5 and 12.6 at% beryllium-0.2 at% zinc alloys which had been quenched or pre-aged before irradiation have been investigated by electrical resistivity measurement, micro-Vickers hardness test, electron microscopic observation and electron diffraction method. The increment in resistivity by irradiation decreased with decreasing supersaturation of beryllium in the matrix of specimens. The large resistivity increase by irradiation in the supersaturated specimens is mainly attributed to G.P. zones formed during irradiation. The isothermal aging curves for the irradiated specimens at 250°C consist of two stages. The first stage is interpreted as due to the dissolution of G.P. zones formed during irradiation. On the early period of the second stage, an appreciable precipitation of intermediate γ′ phase was observed, which is considered due to the enhanced nucleation by irradiation.抄録全体を表示PDF形式でダウンロード (2217K) -
大谷 南海男, 伊庭 暉邦1969 年 33 巻 7 号 p. 781-785
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーStress corrosion cracking test of 18-8 stainless steel was carried out in a 42%MgCl2 solution. The crystallographic orientation of various cracks in the specimen was especially examined. The results obtained are as follows:
The cracks observed are classified into four groups; pit type cracks along (111) or (100) planes, LC type cracks along the(110) plane based on the Lomer-Cottrell barrier, dislocation pile up type cracks near grain boundaries and mixed type cracks of the above mentioned ones.
At the initial stage of the test (induction period), there seems to be many pit type cracks which are related to the corrosion of grain boundaries and slip lines. On the contrary, all the types of cracks are observed in large quantities at the end of the test.
Although the effect of applied stress on fracture becomes remarkable at the final stage of the test, it requires a further study as to which is more important to fracture, the tunnel formation effect by corrosion pits or the destructive effect of applied stress.抄録全体を表示PDF形式でダウンロード (1477K) -
添野 浩, 土屋 正利1969 年 33 巻 7 号 p. 786-790
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe internal friction due to nitrogen in iron alloys containing less than 2.5 atomic pct wolfram was measured at frequencies of about 0.5, 1.0, 5.0 and 500 c/s, and two peaks were observed.
From the peak shifts, activation energies were determined as 17.2 kcal/mol for low temperature peak and 19.1 kcal/mol for high temperature peak. The low temperature peak, which can be nearly described by a single relaxation time, is interpreted as jumps of nitrogen atoms in strained Fe-Fe interstices produced by the addition of wolfram atoms. The origin of the high temperature peak is attributed to the stress-induced diffusion of nitrogen atoms in the vicinity of wolfram atoms. However, the half-width of the high temperature peak is by far broader than that of a peak having a single relaxation time. The broadening is discussed and is explained by allowing the relaxation time to have an appropriate error-functional distribution.
The precipitation of nitrides was also investigated by using an iron alloy containing 2.5 atomic pct wolfram and 300 ppm nitrogen. No precipitation of nitride other than Fe8N and Fe4N was observed.抄録全体を表示PDF形式でダウンロード (1947K) -
添野 浩, 黒田 哲郎1969 年 33 巻 7 号 p. 791-795
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe kinetics of the beta-phase decomposition and the precipitation of alpha-zirconium were investigated by measuring the changes in electrical resistivity at liquid nitrogen temperature. The reaction in the miscibility gap region was carried out by heating the specimens of the beta-phase to a given temperature. The effect of cold work on the rates of the decomposition was also investigated. The kinetics of the decomposition are conveniently described with T-T-T curves between 650° and 800°C. Two modes of the decomposition, continuous and discontinuous types, were observed and the proceedings of them were assumed to be affected not only by the decomposition temperature but also by the amount of cold working. Consequently, somewhat complex T-T-T curves were obtained. A geaneral accelation of the decomposition caused by cold working is also given in the T-T-T curves.
The precipitation of alpha-zirconium was investigated by using the specimens previously decomposed in the miscibility gap region. The rates of the precipitation and the effect of cold working on the rates are described with T-T-T curves between 400° and 550°C.抄録全体を表示PDF形式でダウンロード (1752K) -
美馬 源次郎, 田中 靖三1969 年 33 巻 7 号 p. 796-800
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe aging characteristics of a Mg-4 wt%Zn alloy were studied over the temperature range between 0°C and 200°C by means of electrical resistivity and hardness measurements, the X-ray Debye-Scherrer method and electron microscopic observations.
The aging drocesses have been analyzed kinematically using the C-curve which was obtained by plotting the logarithm of the incubation value against the reciprocal of the absolute temperature of the aging. It is found that the C-curve can be distinguished in the temperature ranges, i.e. above 110°C, 110°∼60°C and below 60°C. The existence of the three stages in the aging processes above 110°C have been confirmed by X-ray analysis and electron microscopic observations. These processes are summarized as follows; supersaturated solid solution→pre-β′→β′→β (MgZn). The apparent activation energy calculated from the slope of the linear part of the C-curve is about 29 kcal/mol for β′ precipitates and about 24 kcal/mol for pre-β′. The aging processes in the temperature ranges of 110°∼60°C and below 60°C may be characterized by the formation of G.P. zones.抄録全体を表示PDF形式でダウンロード (2028K) -
増田 良道, 渡辺 竜三1969 年 33 巻 7 号 p. 801-806
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe mechanism of material transport during the process of liquid-phase sintering was studied in a model experiment, in which twisted iron wires were sintered in molten silver and the neck growth between the wires was measured as a function of time and temperature.
In the sintering with liquid silver the centers of wires did not approach because no grain boundaries were formed in the neck area even though an appreciable neck growth was observed. The rate of neck growth in the sintering with liquid silver was higher than the case without the liquid, and this was explained as a cumulative effect of two types of mechanisms of material transport, which are the solution-diffusion-precipitation and the volume diffusion. Contributions of the latter mechanism to the neck growth were less than those of the former.抄録全体を表示PDF形式でダウンロード (2148K) -
轟 理市, 門 智1969 年 33 巻 7 号 p. 806-810
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe analyses of rust layers were performed on atmospheric corrosion resistant low-alloy steel and carbon steel exposed at semi-rural atmosphere for three and six years. The results obtained were as follows:
(1) According to the results of square analysis of rust layer by X-ray microanalyzer, chromium, copper, phosphorus and sulfur were found to be concentrated in the rust layer of low-alloy steel. Sulfur was more concentrated in the rust layer of low-alloy steel than in that of carbon steel. The concentration of nickel in the rust layer was scarcely observed.
(2) The results of chemical analysis showed that the sulfur content in the inner rust layer of low-alloy steel was twenty times higher than that in the substrate metal. This should result from an incorporation of SO2 in atmosphere in the rusting reaction.
(3) From X-ray diffraction experiments of the rust layers, α-FeOOH, γ-FeOOH and Fe3O4 were observed in both low-alloy steel and carbon steel. No features of atmospheric corrosion resistant low-alloy steel were found by this method.抄録全体を表示PDF形式でダウンロード (1435K) -
轟 理市, 門 智1969 年 33 巻 7 号 p. 810-815
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe atmospheric corrosion of steel is thought to proceed in a concentrated sulfuric acid environment, because ferrous sulfate probably formed by its reaction with SO2 in atmosphere exists under the rust layer and is not oxidized immediately by oxygen supplied through the rust layer. Thus the corrosion characteristics of low-alloy steel in 98% sulfuric acid was investigated in comparison with carbon steel. The conclusions obtained were as follows:
(1) The results of the rotating immersion test in 98% sulfuric acid showed that the corrosion rate of low-alloy steel was remarkably lowered with the lapse of time after four weeks of immersion. This behavior is quite different from that of carbon steel.
(2) The anodic polarization of low-alloy steel was nearly the same as that of carbon steel in the early stage of immersion. However, as the corrosion progressed, the anodic reaction of low-alloy steel was suppressed more remarkably than that of carbon steel.
(3) Corrosion products of both low-alloy steel and carbon steel were FeSO4 n H2O. However, from the analytical results by the X-ray microanalyzer, it was found for low-alloy steel that there was a very thin oxide film containing chromium, copper and other alloying elements in high concentrations at the alloy/iron sulfate interface.
(4) Addition of Cl− ion into 98% sulfuric acid lowered the anodic polarization of steel. The role of Cl− ion is thought to destruct the stability of the passive oxide films. The passive film formed on low-alloy steel is more stable than that of carbon steel.
From the above experimental results, the corrosion characteristics of steel in concentrated sulfuric acid is quite similar to that of atmospheric corrosion. It is certain that the very thin oxide film existing between the iron sulfate layer and the substrate metal plays a predominant role in the corrosion of steels.抄録全体を表示PDF形式でダウンロード (1718K) -
轟 理市, 門 智1969 年 33 巻 7 号 p. 815-819
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe corrosion characteristics of passivated steel in dilute sulfuric acid may correspond to that of steel immersed in concentrated sulfuric acid. Accordingly, the stability of the passive films of low-alloy steel and carbon steel in 5% sulfuric acid was electrochemically investigated by the addition of Cl− ion, and the results were compared with the atmospheric corrosion resistance of these steels. The results obtained were as follows:
(1) The time variation of the anodic dissolution current after adding Cl− ion (200∼1000 ppm) was followed for steels in the passive state in 5% sulfuric acid. It was found that a longer time was needed before commencing a steep rise of current for steels of higher atmospheric corrosion resistance. These results differenciating the stability of passive films were found to correspond with those of the atmospheric exposure test for five years in the industrial atmosphere.
(2) The passive film of low-alloy steel is more resistant to the destructive action of Cl− ion than that of carbon steel. This fact is related to the corrosion characteristics of steel in concentrated sulfuric acid. Hence, it seems that the atmospheric corrosion of low-alloy steel is controlled mainly by the anodic reaction at the thin oxide film formed on the metallic surface.
This method is more convenient than the concentrated sulfuric acid method described in an earlier paper, and it can evaluate the atmospheric corrosion resistances of low-alloy steels rapidly.抄録全体を表示PDF形式でダウンロード (1280K) -
白川 勇記, 丹治 雍典1969 年 33 巻 7 号 p. 819-824
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe change in Young’s modulus E by the magnetic field H, the ΔE effect of Ni has been investigated in as-cold worked and annealed states with an electrostatic driving method. The dynamic stress σ was measured with an interference comparametor. The results obtained are as follows: (1) The saturation value of the ΔE effect (ΔE⁄E0)s is 2.1% in the as-cold worked state and increases rapidly as annealed at 400°C and then gradually approaches a constant value after a complicated change. (2) The E-H curve measured with a low resonance frequency shows a minimum in the weak magnetic field. The minimum decreases with increasing resonance frequency and finally vanishes. (3) The frequency dependence of the ΔE efffect is most remarkable at the magnetization I⁄Is=0.7∼0.6. (4) The stress dependence of E in σ=3.4∼49.0 k dyne/cm2 is not remarkable in any magnetized state. (5) The three types of the ΔE curve may be qualitatively explained on the assumption that the dynamic ΔE effect is a combined one of the variation in magnetostriction and the effect of vibration.抄録全体を表示PDF形式でダウンロード (1557K) -
蒲地 一義, 宮田 節夫, 衛藤 正美1969 年 33 巻 7 号 p. 824-829
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe Phenomena on the hydrogen induced plastic deformation in plain carbon steels was previously studied by the authors, and those on austenitic stainless steels are described here.
When hydrogen is introduced into the austenitic stainless steels by the electrolytical method, the structure changes are observed. A part of the matrix of austenite transforms partly to the alpha phase of BCC and partly to the epsilon phase of HCP structure. In addition to the characteristic diffraction peaks of these newly produced structures, X-ray diffraction lines of the matrix austenite phase show abnormal profiles which indicate that the diffraction lines of some another peaks are superposed on those of austenite.
The structure changes and the unanalyzed peaks seem to be characteristics in the hydrogen charged austenitic stainless steels containing nickel. With the introduction of hydrogen into a nickel plate of 99.0% purity, strong peaks from the unanalyzed phases have also been obtained.抄録全体を表示PDF形式でダウンロード (1591K) -
鈴木 章, 中村 実人1969 年 33 巻 7 号 p. 830-833
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーMetallographic examination has been made of the 99.85% purity Aluminum ingot applied a high pressure during solidification.
In the ingot solidified under a pressure of 2550 kg/cm2, a wide equiaxed zone consisting of fine grains was produced. The photomicrograph of the fine equiaxed grains showed “predendritic” regions. It is concluded that these fine equiaxed grains have nucleated by supercooling abruptly produced in the liquid phase as a result of the rise in freezing point due to the increase in pressure.
And, it is observed that by applying the high pressure, the substructure of columnar grains changes from cell or cellular dendrite formed at atmospheric pressure to dendrite with side branches and finally to cell. The formation of side branches is attributed to the occurrence of a negative temperature gradient in the liquid phase ahead of the freezing front. However, it is difficult to explain the disappearance of them in terms of the degree of thermal or constitutional supercooling.抄録全体を表示PDF形式でダウンロード (2105K) -
鈴木 章, 中村 実人, 坂本 敏正1969 年 33 巻 7 号 p. 834-839
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーAl-0.2%Cu alloy ingots have been solidified under atmospheric and high pressures to measure the change in freezing point due to the pressurization. The increase of 21°C in freezing point has been observed when solidified under a pressure of 2072 kg/cm2. This value is in good agreement with the calculated one by Clapeyron’s equation.
Metallographic examinations of the ingots solidfied under the high pressure have shown that coarse equiaxed grains appears as a “comet” shape with a head which is coarsely dendritic and a tail which is finely cellular. Experiments using mechanical barriers have also indicated that coarse head is originally a part of the top surface dendritic layer of the ingot, which is formed by freezing on contact with the asbestos used as the insulator.抄録全体を表示PDF形式でダウンロード (2579K) -
鈴木 章, 岩田 至弘, 戸田 晴彦1969 年 33 巻 7 号 p. 839-844
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーStandard samples were prepared by fully homogenizing a set of low-alloy steels. Then, working curves were made out, demonstrating the relationships between contents of alloying elements and the X-ray intensity with electron-probe microanalysis. Using these working curves, the influence of cooling rate during solidification on the microsegregation of chromium and molybdenum in the interdendrite of a 4-ton commercial steel ingot was measured.
In the columnar crystal zone, the effective partition coefficient was approximately constant regardless of the large variation in cooling rate, but the segregation index increased to some extent with decreasing cooling rate.
The degree of microsegregation was by far greater in the equiaxed than in the columnar crystal zone. Therefore, it is supposed that the microsegregation arising during solidification depends upon the mode of solidification rather than upon the experimentally measured parameters of solidification such as temperature gradient and freezing rate. The effective partition coefficient was lower in the equiaxed than in the columnar crystal zone.抄録全体を表示PDF形式でダウンロード (2093K) -
永倉 充, 荒井 祓彦1969 年 33 巻 7 号 p. 844-849
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe MnBi magnet poses a problem in its practical use because of the tendency due to oxidation, in spite of its excellent magnetic properties. In the present study samples were prepared by firing compacts of Mn and Bi powders in stoichiometrical composition (Mn:Bi=3:2) at 260°C for 20 hr, pressing the compound with and without orienting magnetic field and sintering the compact at 250°C to 350°C for 3 hr. Then the effects of sintering were investigated on their magnetic properties and their oxidation behavior of sintered magnets with and without Cu plating. The results may be summarized as follows:
(1) The Magnetic properties were improved by sintering; especially, the effects of sintering on magnetic properties of anisotropic specimens were very distinct in Bs, Br, Br⁄Bs and (BH) max., etc. It was confirmed that fine particles of the compound grew in the field direction applied during pressing.
(2) The effect of sintering on the oxidation behavior is clear and also the Cu-plated samples can perfectly prevent oxidation.抄録全体を表示PDF形式でダウンロード (1486K) -
川原 浩司1969 年 33 巻 7 号 p. 849-855
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーHardness measurement, transmission-electron microscopy, and extraction replicas have been used to study reaging and softening behaviors of the martensite over-aged at different temperatures. Some phenomena difficult to explain in terms of diffusional process were observed, as follows:
(1) There was a similarity in kinetics of hardening between the aging of the martensite with high dislocation density and the reaging of the martensite with numerous larger Ni3Ti phases, (2) The rate of age hardening of the martensite was independent of dislocation density, and (3) The softening of the over-aged martensite occurred quickly on reheating to 800°C, although little change in aggregation or dissolution of Ni3Ti phases in the martensite was observed.
These results suggested that hardening and softening in this alloy may be associated with a non-diffusional process, that is, a change in coherency between the matrix and Ni3Ti clusters, without any diffusional processes such as precipitation, aggregation, and dissolution of Ni3Ti phases.抄録全体を表示PDF形式でダウンロード (2733K) -
桜井 浩, 矢野 清之助, 井上 泰, 三村 宏, 青木 宏一1969 年 33 巻 7 号 p. 856-862
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIt is well known that the notch toughness of 9%Ni steel is embrittled by cold deformation, especially by deformation at −196°C. Therefore, we clarified this phenomenon in the light of the correlation between cold deformation (prestraining 4% by tensile test) and the metallurgical characteristics such as the susceptibility of temper brittleness or the stability of temper-formed austenite. The main results are as follows: (1) In the low tempering temperature range (800°C·1 hr-oil quenched→500°C·1 hr-water cooled), it seems that the weakening of the temper-embrittled grain boundaries is accelerated by prestraining and the transititon temperature rises. (2) In the high tempering temperature range (800°C·1 hr-OQ→600°C·1 hr-WC), it is concluded that the deformation is constrained by martensite transformed during prestraining at −196°C and it causes a pronounced rise in the transition temperature. (3) In the optimum heat treatment(800°C·1 hr-OQ→575°C·1 hr-WC), the rise in the transition temperature is not observed. But in the case of slow quenching, i.e. air cooling, the amount of retained austenite increases and it remains after tempering. Therefore, the retained austenite transforms to martensite by prestraining at −196°C and the rise in the transition temperature is observed. (4) It seems that the rise in the transition temperature by prestraining at R. T. is caused by strain ageing.抄録全体を表示PDF形式でダウンロード (2328K) -
依田 連平, 渡辺 亨, 佐藤 有一1969 年 33 巻 7 号 p. 862-868
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe recrystallization temperature of Ni-20Cr alloys having a γ single phase, containing aluminum or titanium less than the solubility limits at room temperature, rises similarly with the aluminum or titanium content. When the concentration of alloying element is over the solubility limits, the recrystallization temperature of the alloy containing aluminum rises markedly by the general precipitation of γ phase (Ni3Ti) from 550°∼600°C, while that of the alloy containing titanium is lowered remarkably by the discontinuous precipitation of η phase (Ni3Ti) along the slip band and the grain boundary. The non-equilibrium γ phase of Ni3Ti with fcc crystal structure precipitates finely in the γ phase matrix except the region of the discontinuous precipitation in the alloy containing titanium, and the γ fine particles contribute to age hardening of the alloy. But this non-equilibrium γ′ phase decomposes into the equilibrium η phase with increasing annealing temperature and the recrystallization finishes. The relation between the solid-solution temperature of precipitates and the complection temperature of recrystallization is proportional for the alloy containing aluminum, but in inverse proportion for the alloy containing titanium and the solid-solution temperature of the latter alloy is always higher than that of the former alloy.抄録全体を表示PDF形式でダウンロード (2290K) -
西沢 泰二, 千葉 昂1969 年 33 巻 7 号 p. 869-870
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーPDF形式でダウンロード (421K)
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