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66 巻, 8 号
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武田 喜三1980 年 66 巻 8 号 p. 1055
発行日: 1980/07/01
公開日: 2009/06/19
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土屋 脩, 大槻 健, 杉山 健, 小野田 守, 藤田 勇雄1980 年 66 巻 8 号 p. 1057-1065
発行日: 1980/07/01
公開日: 2009/06/19
ジャーナル フリーThis paper describes experimental results of physical and reducing properties of pellets up to 1 100°C of reduction temperature as a function of basicity, SiO2 contents and indurating temperature during the addition of limestone. These properties are closely correlated to the bonding structures of indurated pellets which are classified into 6 types.
Those are hematite (A), hematite+low-basicity silicate slag (B), hematite+calcium ferrite (C), hematite+high basicity silicate slag+di-calcium silicate (D), A+B, and C+D bonding structures.
A-type pellets have lower crushing strength and higher open porosity, swelling index and reduction degree, B-type ones have the highetst crushing strength and swelling index and the lowest open porosity and reduction degree, C-type ones have the highest open porosity and reduction degree and the lowest swelling index, and D-type ones have much higher crushing strength and reduction degree and much lower swelling index.
Therefore, physical and reducing properties of pellets change remarkably by adding limestone.
Pellets with (C+D)-bonding structures give the highest levels of crushing strength and reduction degree, and the lowest swelling index.抄録全体を表示PDF形式でダウンロード (3550K) -
角戸 三男, 槌谷 暢男, 岡部 侠児, 三本木 貢治1980 年 66 巻 8 号 p. 1066-1074
発行日: 1980/07/01
公開日: 2010/01/18
ジャーナル フリーFe-Csat-Ti系溶融合金でのTiとCの溶解度を,それぞれに適した測定方法を考案し,アルゴン雰囲気下で測定した.以下にその結果を総括する.
(1) 静置拡散法を用いたアルゴン雰囲気下でのFe-Csat-Ti系のTi溶解度は,1304℃で0.46%,1348℃で0.66%,1391℃で0.82%,1450℃で1.09%,1501℃で1.43%であり,温度依存性は次式で表される.
log[%Ti]=(-6760/T)+3.965
なお,本測定値の妥当性は逆方向からの反応を用いた実験結果とよく一致することから裏付けられた.
(2) 静置拡散法でるつぼごと水中急冷した試料のメタル断面に見られる析出TiC粒子の生成原因を,顕微鏡観察とEPMAによるライン分析から詳細に検討した結果,これらの粒子は冷却時の凝固過程で析出したと断定した.また,黒鉛るつぼ壁面近傍に認められた粒子は平衡到達後に析出,成長したものであると判断したが,この場合,低温ほど結晶粒子の成長が大きく,高炉炉底でのTi(N,C)成長を検討する上での手掛りになると考えられる.
(3) 急速吸引急冷法を用いたアルゴン雰囲気下でのFe-Csat-Ti系のC溶解度は,1350℃で4.81+0.178[%Ti],1400℃で4.90+0.186[%Ti],1450℃で5.03+0.181[%Ti],1500℃で5.15+0.171[%Ti]である.
(4) メタル中Ti濃度とC溶解度の関係より,C飽和状態下での相互作用助係数eCTiを計算すると,1350℃で-0.205,1400℃で-0.209,1450℃で-0.200,1500℃で-0.195となり,その温度依存性は次式で表される.
eCTi=(-221/T)-0.072
(5) 本測定実験より得られた熱力学的数値を用いて,Ti+Csat=TiC(s)反応の標準自由エネルギ変化ΔG°を計算し,-30500+13.3Tcalを得た.抄録全体を表示PDF形式でダウンロード (5109K) -
一瀬 英爾, 円尾 俊明, 佐生 博保, 上島 良之, 盛 利貞1980 年 66 巻 8 号 p. 1075-1083
発行日: 1980/07/01
公開日: 2009/06/19
ジャーナル フリーThe ion intensities of iron in Fe-Mo alloys have been measured at 1 823K over the whole range of composition by the Knudsen cell-mass spectrometric method, and the activities of iron and molybdenum in this binary system were determined. In this method silver or iron was used as the internal standard substance to cancelthe constants which are intrinsic in the measurement and can not be determined. The activity coefficients of molybdenum and iron in the infinitely dilute solutions are as follows:
γoMo(1)=1.54(+0.32-0.26), γoMo(s)=0.70(+0.39-0.37) and γoFe(1)=6.0(±1.1)
The first and second order interaction parameters of molybdenum in liquid iron, ε(Mo)Mo and ε(Mo)2Mo in atomic fraction unit and e(Mo)Mo and e(Mo)2Mo in weight percent unit are represented as follows:
ε(Mo)Mo=4.1(±1.4), ε(Mo)2Mo=-11.0(±4.1) and
e(Mo)Mo=1.21×10-2(±0.35×10-2), e(Mo)2Mo=-1.1×10-4(±0.8×10-4).
Furthermore, the heat of sublimation at 298K and fusion of pure iron have been determined by the second law method as follows:
ΔHs(α)298=414kJ/g-atm
ΔHm1809=15.1kJ/g-atm.抄録全体を表示PDF形式でダウンロード (1215K) -
川和 高穂, 今井 〓一郎, 国定 泰信, 田口 喜代己1980 年 66 巻 8 号 p. 1084-1092
発行日: 1980/07/01
公開日: 2010/05/25
ジャーナル フリーA fairly simple model is proposed, which explains the formation mechanism of equi-axed crystals and predicts the profile of equi-axed zone in ingots. The validity of the model is proved by comparing the results of the experiments with that of the calculation according to the model.
The results are as follows:
(1) Profiles of equi-axed crystal zone in ingots, calculated by the above model, well coincide with that observed on the macro solidification structure of ingots.
(2) The model is based on the assumption that the rate of equi-axed crystal formation is proportional to the volume of liquid/solid zone (interdendritic zone).
(3) Therefore, equi-axed crystals in ingot are formed mainly at solidification front (liquid/solid zone) and sediment to the bottom of ingot to form equi-axed crystal zone, when the pouring temperature of steel is high enough and the steel meniscus is well covered with the exothermic powder, which excludes "showering" from the meniscus.抄録全体を表示PDF形式でダウンロード (4763K) -
伊藤 幸良, 岡島 忠治, 田代 清1980 年 66 巻 8 号 p. 1093-1102
発行日: 1980/07/01
公開日: 2009/06/19
ジャーナル フリーRefining of the solidification structures of Type 430 stainless steel by the mechanical vibration and the liquid surface vibration was tried. The structures of 15 kg test ingots were remarkable improved by these vibration methods. Change of structure into the equiaxed one starts after the superheat of liquid steel disappears.
The liquid surface vibration was applied to 6t ingots for practical use and its effect on structure refining was confirmed. By the investigation of size of crystals and negative segregation in the equiaxed zone, it was concluded that the structure refining was caused by the showering of the free crystals.
In the case of continuously cast slabs, the liquid surface vibration was effective only under low superheat.抄録全体を表示PDF形式でダウンロード (13780K) -
千々岩 健児, 畑村 洋太郎, 鈴木 徹郎1980 年 66 巻 8 号 p. 1103-1112
発行日: 1980/07/01
公開日: 2009/06/19
ジャーナル フリーA new experimental method for stress analysis of a steel slab in hot rolling or continuously cast slab by plasticine is developed. When plasticine is used for simulation of steel in high temperature, it is thought that not only the simulation of deformation, which has been made conventionally, but also the simulation of stress and force is capable. First, many kinds of stress detectors-miniature pressure cell, miniature frictional stress cell, and internal stress cell- are developed with success. Then an apparatus of simulation with 2 stand rolls equipped with above detectors is made, and it is possible to measure the following items:
(i) Distribution of stresses (pressure, circular frictional stress and axial frictional stress) on thesurface of a roll.
(ii) Distribution of internal stress (direction and magnitude of principal stress) in a workpiece.
(iii) Deformation of workpiece and load or torque acting on a roll.
Finally an experiment of rolling by single stand is made as an example. Deformation, load and torque, distributions of many kinds of stresses are clarified and the precision of the experimental method is confirmed.抄録全体を表示PDF形式でダウンロード (7228K) -
小泉 真人, 菊池 勁, 板東 誠志郎1980 年 66 巻 8 号 p. 1113-1122
発行日: 1980/07/01
公開日: 2009/06/19
ジャーナル フリーUntil recently, conventional grain oriented silicon steel strip was made exclusively from ingots. In conventional procedures, reheating to exceedingly high temperature is necessary to assure solution of MnS in the slab prior to hot rolling.
In this paper, therefore, the authors investigated the morphology changes of MnS in the manufacturing process without being reheated in exceedingly high temperature for solution treatment. It was found out that the MnS inclusions were broken into small particles, or deformed and recrystalized into small crystals. On the other hand, the temperature at which all the manganese sulphide was dissolved depended on the product of the concentrations of sulphur and manganese in solution in the 3% silicon steel.抄録全体を表示PDF形式でダウンロード (4792K) -
小泉 真人, 菊池 勁, 板東 誠志郎1980 年 66 巻 8 号 p. 1123-1132
発行日: 1980/07/01
公開日: 2009/06/19
ジャーナル フリーIn an attempt to produce grain oriented silicon steel sheets without conventional high temperature slab reheating and hot rolling processes, series of experiments were carried out using two types of cast slabs of 5 mm and 40 mm thick. Relationship between the magnetic properties and the morphology of MnS was investigated for various processing conditions.
In the cast slab of 40 mm thick, the changes in magnetic properties were examined after processing without reheating to an exceedingly high temperature for solution of MnS.
In the cast slab of 5 mm thick, good magnetic properties were obtained without slab reheating or hot rolling. This is due to the fine MnS particles distributed uniformly in the matrix by rapid cooling in the solidification process. In the conventional casting, coarse MnS particles and segregation bands are formed due to the slow cooling rate in the solidification process which necessitates a high temperature slab reheating to dissolve these particles.抄録全体を表示PDF形式でダウンロード (6943K) -
酒井 忠迪, 梶 晴男1980 年 66 巻 8 号 p. 1133-1141
発行日: 1980/07/01
公開日: 2009/06/19
ジャーナル フリーEffects of impurities P, S, As, and Sb and those of alloying elements Si and Cu on the density and growth of methane bubbles formed on grain boundaries in 2.25Cr-1Mo steel by hydrogen attack were investigated.
The results are summarized as follows:
(1) The addition of 0.016 wt%Sn to the high-purity steel increased the bubble density and diameter by factors of 2.7 and 1.15 respectively.
(2) The addition of 0.016 wt%Sb increased the bubble density by a factor of 2 to 3, but reduced the bubble diameter to 0.8.
(3) The addition of either 0.016wt%P or 0.017wt%As decreased the bubble density by a factor of 0.750.5, while the growth rate was unchanged.
(4) Phosphorus and arsenic, however, could not relieve the above effects of tin and antimony.
(5) The bubble density and diameter of 0.26wt%Si steel were 1.3 and 1.4 times those of 0.016 wt%Si steel respectively, where both the steels contained all of the impurities by 0.01wt% each.
(6) The addition of 0.2wt%Cu decreased the bubble density but could not relieve the effects of tin and antimony when added together, while it increased the growth rate.
(7) Temper-embrittlement treatment further reduced the bubble density in 0.016wt%P steel magnifying the effect of phosphorus, while the effect of tin was not magnified by the treatment in 0.016 wt%Sn steel.抄録全体を表示PDF形式でダウンロード (4757K) -
加藤 哲男, 草加 勝司, 久田 建男1980 年 66 巻 8 号 p. 1142-1149
発行日: 1980/07/01
公開日: 2010/05/07
ジャーナル フリーAn investigation was made of the influence of pressing and sintering conditions, and S addition up to 0.4% on the machinability of 304L sintered stainless steels manufactured by the water-atomized powders.
The results were as follows.
(1) The sintered density gave remarkable influence on cutting resistance. The resistance got smaller first, and then larger with increasing density, having the minimum value around 7g/cm3 of density.
(2) There occurred a change of the shape and the density of cutting chips with the density of materials. The resistance got larger in proportion to ΔD=|Ds-Dc|, where Ds, Dc were the density of specimens and chips, respectively.
(3) Sulphur addition had no influence on original powder characteristics. Cutting resistance decreased with increasing amount of S, and accordingly, tool life could be remarkably improved.抄録全体を表示PDF形式でダウンロード (3491K) -
長野 博夫, 小若 正倫1980 年 66 巻 8 号 p. 1150-1159
発行日: 1980/07/01
公開日: 2010/01/18
ジャーナル フリー(1)25Cr-6Ni-2Mo系二相ステンレス鋼ではα相にCr,Mo,γ相にNi,Cu,Nが濃縮する傾向がある.例えば,母材部において,Cr,Mo量は2Mo系ではα相で28.1%Cr-2.4%Mo,γ相で24.7%Cr-1.6%Mo,3Mo系ではα相で28.4%Cr-4.2%Mo,γ相で24.2%Cr-2.8%Moである.CrおよびMoなど耐食性に重要な役割をはたす元素のα相およびγ相における分配が著しく異なることが判明した.
(2)耐全面耐食性に関しては,N含有量の低い25Cr-6Ni-0.4Cu-2Mo-1owN鋼(0.07%N)の溶接部が劣化する傾向があるが,N量0.1%以上の25Cr-6Ni-2Mo-N鋼および25Cr-6Ni-0.4Cu-3Mo-N鋼では劣化する傾向がない.前者では溶着部および熱影響部の組織はα相一相となつている.
(3)耐粒間腐食性を,Mod.Strauss試験およびHuey試験によつて検討した結果,Strauss試験において25Cr-6Ni-0.4Cu-2Mo-1owN鋼のみ溶接部に粒間腐食がみられた.粒間腐食はフェライト粒界に発生している.
(4)耐すきま耐食性に関しては,2Mo系の二相ステンレス鋼の溶接部の耐食性は母材部にくらべてかなり劣る.特に溶接部の耐食性が劣るのは25Cr-6Ni-0.4Cu-2Mo-lowN鋼で,粒界腐食型のすきま腐食を呈した.N量の0.1%以上の25Cr-6Ni-2Mo-N鋼におけるすきま腐食ではγ相が選択溶出する傾向があつた.25Cr-6Ni-0.4Cu-3Mo-N鋼の耐すきま腐食性は前二者にくらべ大幅に向上した.溶着部のMo含有量が母材相当であれば,その耐食性は母材部とほぼ同等と期待される.抄録全体を表示PDF形式でダウンロード (8735K) -
山口 弘二, 金澤 健二1980 年 66 巻 8 号 p. 1160-1169
発行日: 1980/07/01
公開日: 2009/06/19
ジャーナル フリーThe effects of strain rate and strain wave shape on the fatigue life of SUS 316 and SCMV 3 (11/4Cr-1/2Mo)steels have been investigated using several types of strain wave shapes such as triangular, truncated and sawtooth wave shapes. The data have been analyzed by the strainrange partitioning method proposed by MANSON, HALFORD, and HIRSCHBERG. A new method has been proposed and used for partitioning the inelastic strain range in applying the strainrange partitioning method. Four component strain range versus life relationships have been obtained by both interaction damage rule and conventional damage rule.抄録全体を表示PDF形式でダウンロード (1820K) -
篠田 哲守, 島貫 静, 佐々木 良一1980 年 66 巻 8 号 p. 1170-1176
発行日: 1980/07/01
公開日: 2010/05/25
ジャーナル フリーStress relaxation data for some commertial steels were obtained by means of the ring method originated by Oding, and were compared with that obtained by the conventional tensile method. The date obtained by the ring method agreed with the tensile data within an error 10%, comparing the remeining stress ratio, RSR (residual stress/initial stress). This agreement, however, was imparied when the ring specimen was loaded to an initial stress greater than its yield strength. The initial stress in the ring test specimen was capable of being set to an arbitrary value to an error of less than 6% by using the unique relationship between the initial gap spacing of the ring specimen and the shape constant, A. The stress relaxation tests under an-isothermal conditions were easy to perform using the ring test method. The value of RSR in isothermal part of the test was influenced by the heating rate to reach the test temperature, within only the first 3 or 4 hours of the test.抄録全体を表示PDF形式でダウンロード (1295K) -
宗木 政一, 河部 義邦1980 年 66 巻 8 号 p. 1177-1186
発行日: 1980/07/01
公開日: 2009/06/19
ジャーナル フリーIn order to strengthen and toughen the 350kgf/mm2grade maraging steel through thermomechanical treatment, the effects of processing variables in thermomechanical treatment such as total reduction, start and finish temperatures of rolling, on the properties of 10Ni-18Co-14Mo and 10Ni16.5Co-12.5Mo steels have been investigated. Austenite grain refinement is promoted with increasing the degree of total reduction. When 91% of total reduction is given, austenite grain is refined to 6μm, leading to the tensile strength of 337 kgf/mm2 and the reduction of area of 0%. When the finish temperature of rolling is lowered, grain refinement is also promoted but a large amount of precipitate occurs during thermomechanical treatment. These precipitates have the marked detrimental effect on ductility and toughness in the condition before aging, but does not clearly show the detrimental effect on properties after aging. It is made clear that these precipitates are formed by being promoted due to working during thermomechanical treatment. Therefore, it is so difficult to obtain the extremely fine grained structure with no precipitates and to achieve the 350 kgf/mm2 strength level, by applying thermomechanical treatment for these higher Mo-containing steels.抄録全体を表示PDF形式でダウンロード (2333K) -
有田 行雄, 梶本 勝也1980 年 66 巻 8 号 p. 1187-1198
発行日: 1980/07/01
公開日: 2009/06/19
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國分 正胤1980 年 66 巻 8 号 p. 1199-1205
発行日: 1980/07/01
公開日: 2009/06/19
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岸高 壽1980 年 66 巻 8 号 p. 1206-1214
発行日: 1980/07/01
公開日: 2009/06/19
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-英文校閲者のつぶやき-西川 治1980 年 66 巻 8 号 p. 1215-1216
発行日: 1980/07/01
公開日: 2009/06/19
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月橋 文孝, 小林 一彦, 相馬 胤和, 檀 武弘, 雀部 実, 郡司 好喜, 村上 雅人, 柴田 浩司, 河淵 靖, 三宅 英徳1980 年 66 巻 8 号 p. 1217-1221
発行日: 1980/07/01
公開日: 2009/06/19
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