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62 巻, 10 号
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浅田賞など仲 威雄1976 年 62 巻 10 号 p. 1307-1308
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーPDF形式でダウンロード (2120K) -
長 隆郎, 高田 政記, 井上 道雄1976 年 62 巻 10 号 p. 1309-1318
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーThe rate of hydrogen absorption in the liquid iron stirred inductively were measured by the Sieverts method at constant pressures. The present measurement was carried out under a small interfacial area between the gas and iron melt by using a doughnut-shaped alumina plate on the melt in a narrow crucible.
The results show that the rates of hydrogen absorption are represented by the 1st order reaction and proportional to the square root of hydrogen pressure. The mass transfer coefficients, kH, of hydrogen into liquid iron under the present inductive stirring could be calculated as (19±1). 10-2cm/sec at 1600°C. This value was somewhat higher than those obtained by the literature probably because of the strong inductive stirring. It was found that it was also proportional to the 2/3 power of the diffusion coefficient, DH, of hydrogen in liquid iron.
The effect of dissolved oxygen on the hydrogen absorption seemed to be negligible in the range of low oxygen contents of below 0.039% oxygen. The poisoning effect of surface active oxygen on the nitrogen transfer had been observed, but the similar effect was found in the case of hydrogen absorption.抄録全体を表示PDF形式でダウンロード (2565K) -
高田 寿, 別所 勇, 伊藤 孝道1976 年 62 巻 10 号 p. 1319-1328
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーThe morphology and distribution of sulfide in steel ingot have a close connection with chemical composition of steel and solidification variables. Using steels containing 0.004, 0.01, 0.05, 0.10, and 0.63%S, the authors have investigated the effects of sulfur content and solidification variables on the morphology and distribution of sulfide.
The results obtained are summarized as follows: 1) Morphologies of sulfides are dependent on sulfur content. In the range of sulfur content up to 0.01%, type I sulfide is found and with more than 0.05% sulfur, type II sulfide is observed. The higher the sulfur content, the larger the area of type II sulfide.
2) Large dendritic sulfide (type D) as a primary phase is observed in the specimens containing 0.63% S and 2.88% Mn, and its size is dependent on the cooling rate.
3) From the observation of three dimensional morphology of sulfide using a scanning electron micro scope, it is found that type II sulfide is dendritic and type II and Type D sulfides are occasionally inter connected.
4) The size arid spacing are expressed as a function of the cooling rate, Vin°C /min.
i) Average size of type I sulfide, d in μm; d=13.9 V-0.30ii) Average spacing of rod-like (type II) sulfide, λ in μm; λ=10.7 V-0.30iii) Average size of rod-like (type II) sulfide, d′ in μm; d′=2.9 V-0.22 The average size of rod-like (type II) sulfide is smaller than that of type I at the same cooling rate.
5) Type I and type II sulfides are located in interdendritic spaces, on the other hand, type D sulfides are distributed randomly.抄録全体を表示PDF形式でダウンロード (9774K) -
渡辺 一雄1976 年 62 巻 10 号 p. 1329-1338
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーA mathematical model of the continuous billet heating furnace simulating the dynamic behavior of billet temperature in the furnace as a function of the fuel flow rate and billet speed has been developed.
Flame and combustion-gas temperatures along the furnace are calculated from the combustion heat and heat transfer from both the flame and the combustion-gas. Temperatures of individual billets are calculated from heat transfers from the flame or the combustion-gas and the furnace wall.
The calculated dynamic response of the billet temperature at the extracting time with a change in the fuel flow rate from this model gives a good agreement with the response obtained by the correlation method.抄録全体を表示PDF形式でダウンロード (2032K) -
北川 孟, 片山 道雄1976 年 62 巻 10 号 p. 1339-1348
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーTo investigate the possibility of calculating the Lankford value, r, for a low carbon steel sheet on the basis of three-dimensional orientation distribution function, ω (ψ, θ, φ, ), comparison was made between the calculated r-value and experimental one. ψ, θ, and φ denote a set of Eulerian angles between the coordinate system of crystallite and the reference system of specimen.
The r-values, r (ψ, θ, φ), that were specified by means of Eulerian angles in the same definition as used in describing the orientation of a crystallite in a polycrystalline sheet were computed at 5°intervals for 0°≤ψ, θ and φ≤90°, by taking into account all fourty-eight slip systems in alpha iron and by assuming that an amount of slip in each slip system was proportional to its Schmid factor.
For a polycrystalline sheet the r-value was calculated by
r (ω) /1+r (ω) =4/π2∫π/20∫π/20∫π/20r (ψ, θ, φ) /1+r (ψ, θ, φ) ω (ψ, θ, φ) sin<θdθdφ′dθ
whereψ′=ψ+ω, and ω is an angle between rolling direction and stretching direction.
In practical computation of r (ψ, θ, φ), the following cases were examined: (1) All slip systems whose Schmid factors were not less than a certain value, a, (0≤a<0.5), were assumed to be activated and (2) slip systems of a constant number, ss, were assumed to be activated in all the orientations.
Calculated r-values, r (cal), were in good agreement with the observed ones, r (obs), if no crystal rotation was assumed to take place during deformation. Above all, the values of r (cal) were in accord with those of r (obs) within ± 0.15 in the case where either a=0.10 or ss=32 was assumed.抄録全体を表示PDF形式でダウンロード (1899K) -
清水 信善, 田村 今男, 荒川 寿太郎1976 年 62 巻 10 号 p. 1349-1355
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーThe process of the consuming incubation period for bainitic transformation during continuous cooling, of steels was examined in the relation with consumption of incubation period for ferritic or pearlitic transformation by steels of JIS SUJ2, SCM5, and SNCM8. The main results are as follows: (1) There is a critical temperature (AB) at which the consumption of incubation period for bainitic transformation starts during continuous cooling.
(2) The consumption of incubation period for bainitic transformation is progressed independently of any consumption of incubation period for ferritic of pearlitic transformation.
(3) The bainitic transformation behaviour after a change of cooling rate during continuous cooling shows a different manner from that indicated by a usual CCT-diagram of the steel because of the different way in consumption of the incubation period. The estimation method of the transformation behaviour in such a case was explained by using usual CCT-diagram.抄録全体を表示PDF形式でダウンロード (1374K) -
松田 昭一, 影山 英明1976 年 62 巻 10 号 p. 1356-1362
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーThe effects of TiN particles in low-arbon low alloy steels on the nucleation and growth kinetics of proeutectoid ferrite were studied. Main results are summarized as follows.
(1) TiN particles accelerated ferrite formation and displaced the ferrite-nose in a CCT curve to shorter times.
(2) It appeared that TiN particles served as nucleation sites for proeutectoid ferrite preferentially and may increase the rate of nucleation.
(3) The rate of thickening of the grain boundary ferrite allotriomorphs was not influenced by TiN particles. The result could be explained well by the comparison between γ→a free energy difference and γ/α interface energy increase by the existence of TiN particles.抄録全体を表示PDF形式でダウンロード (5256K) -
大村 泰三, 佐平 健彰, 迫ノ岡 晃彦, 米沢 登1976 年 62 巻 10 号 p. 1363-1372
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーAlloys of Ni-Cr-W-C system were investigated to find a new forgeable alloy which may satisfy the properties required for tube materials of an intermediate heat exchanger for atomic energy steelmaking.
In case of a constant carbon content of around 0.08 weight %, the highest creep rupture strength in air at 1000°C and 1100°C was observed around Ni-20Cr-20W in the Ni-Cr-W system investigated.
Creep rupture strengths at 1000°C and 1100°C of the Ni-20Cr-20W alloy increased with increases of the carbon content and solution heat treating temperature and time.
Details of these phenomena were discussed through the observation of the structures and the analyses of precipitated carbides of materials subjected to the solution heat treatment and the creep rupture test at 1000°C.
The potential of the Ni-20Cr-20W-xC alloys for the required material seem to be very high.抄録全体を表示PDF形式でダウンロード (7411K) -
高橋 栄治, 清水 勝, 隠岐 保博, 石上 修1976 年 62 巻 10 号 p. 1373-1378
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーIn order to improve the drawability of wires and wire rods and to obtain the desirous mechanical properties of drawn wires, lead patenting has long been utilized to practical use. There are, however, some problems about environmental hygiene in the works and environmental pollution in the cause of molten lead. As a means of solving those problems, the fluidized bed patenting method has been studied and developed.
Under the various conditions of fluidized bed temperature, air velocity and cooling time in fluidized. bed, experiments on cooling of heated wires and wire rods in fluidized bed have been carried out. Excellent mechanical properties of the materials patented in fluidized bed, as good as those in lead bath can be obtained by optimization of such factors as fluidized bed temperature, air velocity, cooling time in fluidized bed and austenitizing temperature. The fluidized bed patenting can be successfully applied to the materials from 1 to 11 mm in diameter. The scattering of mechanical properties of the materials patented in fluidized bed is the same as or less than that in lead bath. The drawability of the materials patented in fluidized bed is the same as that in lead bath.抄録全体を表示PDF形式でダウンロード (3085K) -
高橋 栄治, 加藤 猛彦, 荒川 寿太郎, 幸岡 強1976 年 62 巻 10 号 p. 1379-1385
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーRapid heating makes austenite grain of steel finer than usual heating. Study of application of rapid heating to lead patenting of high carbon steel wire rods has been done. After high carbon steel wire rods are rapidly heated and held for short time, they were quenched in oil. High carbon steel wire rods were rapidly heated again followed by cooling in a lead bath. The various properties of wire rods treated described above have been examined.
Wire rods rapidly heat patented in this process are superior to usual lead patented ones in the following points.
(1) Austenite grain of rapidly heated wire rods is finer than that of usually heated ones.
(2) Lead bath temperature in patenting for rapidly heat treated wire rods is lower than that for usually heat treated ones.
(3) Tensile and fatigue strength of rapid heat patented and drawn wires is higher than those of usual patented ones.
(4) Drawability and bending properties of rapid heat patented and drawn wire is better than these of usual patented ones.抄録全体を表示PDF形式でダウンロード (1346K) -
川島 節雄, 青山 幸男, 福井 太, 井上 章吾, 原田 憲二1976 年 62 巻 10 号 p. 1386-1391
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーMany testing devices have been developed for the determination of the weld cracking properties of the steels. These are mainly applied to the plate, but a few of them to stainless steel sheets under 3.0 mm in thickness. Meanwhile, the troubles of the cracks transverse to welding direction have frequently occurred in producing welded tubes.
Therefore, authors have designed and used a new method to evaluate a weld cracking susceptibility of stainless steel sheet. Its features are as follows;
1) Welding bead-on-plate with TIG are under tensile load.
2) As susceptibility index, using a critical strain, which is the elongation of just beginning to crack, and is obtained from relationship between the elongation and number of cracks in unit length.
In this paper, firstly, the device has been described in details and secondly, the availability of this method has been shown from the testing results for stainless steels.抄録全体を表示PDF形式でダウンロード (3338K) -
高張 友夫, 小坂 正剛, 田上 哲也1976 年 62 巻 10 号 p. 1392-1397
発行日: 1976/09/01
公開日: 2010/02/22
ジャーナル フリーA study was made of the successive method of correct determination of O in stainless steels containing high Mn (9-10%) or high Al (2-3%) by Ar carrier coulomatic counting method. The analytical values decreased in the order of specimens dropping. The accurate values were obtained when the concentration of Mn or Al in bathes were less than 3% and 1.2% respectively. Allowable evaporation concentration of Mn was under 0.5% in order to determine oxygen content accurately. The effect of evaporated Al was not confirmed because of its small amounts. According to the above results, it was confirmed that correct determination of O could be made by limiting in number of specimens thrown into a bath or by controlling the concentration of Mn and Al to be less than 3.5% and 1.2% respectively by dilution of specimen with carbon steel. The concentration of Mn or Al was calculated by the following equation; Mn or Al (%) amounts of Mn (or Al) in a bath (g) + [concn. of Mn (or Al) in specimen (%) ×wt. of specimen (g) ×0.01] /total wt. of metals thrown into a bath (g) ×100
Total wt. of metals (g) =wt. of carbon steel (g) +wt. of specimen (g) +wt. of Sn×0.81.抄録全体を表示PDF形式でダウンロード (1158K) -
藤井 哲雄1976 年 62 巻 10 号 p. 1398-1411
発行日: 1976/09/01
公開日: 2010/02/22
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中村 典道1976 年 62 巻 10 号 p. 1412-1417
発行日: 1976/09/01
公開日: 2010/02/22
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松下 幸雄, 鈴木 章, 加藤 健三, 久松 敬弘, 高橋 愛和1976 年 62 巻 10 号 p. 1418-1424
発行日: 1976/09/01
公開日: 2010/02/22
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三瀬 真作, 小滝 昌治, 志水 敏詮1976 年 62 巻 10 号 p. 1425-1448
発行日: 1976/09/01
公開日: 2010/02/22
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片田 中1976 年 62 巻 10 号 p. 1449-1456
発行日: 1976/09/01
公開日: 2010/02/22
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郡司 好喜1976 年 62 巻 10 号 p. 1457-1462
発行日: 1976/09/01
公開日: 2010/02/22
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加藤 公雄, 天辰 正義, 雀部 実, 郡司 好喜, 志村 一輝, 熊田 有宏, 楠橋 幹雄, 金尾 正雄, 柴田 浩司, 石川 準, 中島 ...1976 年 62 巻 10 号 p. 1463-1469
発行日: 1976/09/01
公開日: 2010/02/22
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