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54 巻, 6 号
選択された号の論文の8件中1～8を表示しています
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中谷 文忠1968 年 54 巻 6 号 p. 641-642
発行日: 1968/05/01
公開日: 2010/10/12
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浅野 鋼一, 大橋 徹郎, 塗 嘉夫1968 年 54 巻 6 号 p. 643-672
発行日: 1968/05/01
公開日: 2010/10/12
ジャーナル フリーThe following results have been obtained through the study made on the subject.
(1) Large non-metallic inclusions distribute mainly at the bottom part of an ingot. Whose compositions are (Fe, Mn) O, MnO-Al203 and Mn-Silicate. From the fact that larger inclusions have less value of MnO/FeO, coming closer to the composition of scum, it is estimated that large inclusionsstem partially from scum through rimming action. Since Ca is detected in the aluminate and silicate, they are considered to have origin in slag, refractory and deoxidation products.
(2) With the “ingot parameter” Y-which is defined as ingot width/ingot thickness+0.02 (ingot height-width), relations between ingot dimensions and inclusion distribution and its composition can be clearly shown: when Y becomes bigger, total amount of inclusions and amount of large inclusions (more than 100μ) increase and the inclusions have less value of MnO/Fe0.
The parameter Y is considered to have some relationship with thickness of viscous laver at the bottom part of ingot and with state of flow of rimming steel in the mold. Y therefore, is a good index to explain conditions of scum movement along rimming action, scum trap and precipitation of (Fe, Mn) O.
(3) With shorter capping time, increase in total amount of inclusion is observed, but the amount of large inclusions decreases.
This result is explained as follows:
When capping time becomes shorter, more oxygen, which would be otherwise eliminated through rimming action as CO, remains to react with iron and manganese which results in higher amount of nclusion.
Growth of inclusions is hindered as rimming action is terminated earlier, which results in less amount of large inclusions.抄録全体を表示PDF形式でダウンロード (8465K) -
音谷 登平, 形浦 安治, 佐藤 敬1968 年 54 巻 6 号 p. 673-678
発行日: 1968/05/01
公開日: 2010/10/12
ジャーナル フリーSome experiments were carried out by means of X-ray diffraction, electrolytic isolation and potentiostatic etching technique, in order to make clear the relation between precipitated carbides and σ-phase in 25Cr-20Ni heat-resistant cast steel.
The results obtained were summarized as follows:
(1) When electrolytic residues contain more than 5wt% of σ-phase, it can be identified by X-ray diffraction method.
(2) For the electrolytic isolation of σ-phase, 45wt% FeCl3 aq. solution showed a favourable result as compared with 10vol% HCl-C2H5OH solution.
(3) Not only M7C3 is distinguishable from M23C6 carbide but also σ-phase from M23C6 by means of potentiostatic etching in 10 n-NaOH solution. At 200mV vs. Hg-HgO reference electrode M23C6 carbide is etched more rapidly than M7C3 carbide or σ-phase, at 500mV M23C6 and M7C3 carbides, or M23C6 and σ-phase are simultaneously etched, and at 600mV, σ-phase etched most rapidly.
(4) From these investigations it was found that σ-phase may be possible to precipitate even in the prolonged heat treated cast steel containing 0.35% carbon.抄録全体を表示PDF形式でダウンロード (2359K) -
小指 軍夫, 久保田 広行1968 年 54 巻 6 号 p. 679-680
発行日: 1968/05/01
公開日: 2010/10/12
ジャーナル フリーThe temperture rise due to hot rolling was qualitatively evaluated by rolling plates with inserted thermocouples. In rolling at high reductions, thermocouples were shortcircuited by oxidation scale in the vicinity of the junction. However, this was found to exert no influence on temperature readings.
The temperature rise ranged between 10°C and 45°C for the conditions studied (1150-800°C, 10-40% reduction), and showed a better correlation with mean flow stress rather than with amount of plastic work in rolling.抄録全体を表示PDF形式でダウンロード (275K) -
上城 太一1968 年 54 巻 6 号 p. 681-690
発行日: 1968/05/01
公開日: 2010/10/12
ジャーナル フリーα鉄の単結晶を圧延するときに最終安定方位に至るすべり回転を, おのおの最大の分解せん断応力を有する1つまたは2っの {011} 〈111〉, {112} 〈111〉または {123} 〈111〉すべり系が協同して活動するものと仮定して, (001) 標準ステレオ投影上で幾何学的に解析した.
(1) 〈112〉方向が圧延方向と活動すべり方向の間に存在するような方位をとつている結晶は最初 {111} 〈112〉方位となる. そこで {011} 〈111〉すべり系において共役すべりが広範囲に起こると考えると, {111} 〈112〉集合組織成分は最も安定な終着方位 {112} 〈110〉に向かつて徐々に移動する. しかしながらもし {112} 〈111〉すべり系の活動のために, 圧延面法線が {112} に向かつて回転することが困難になると, 圧延面に垂直な〈111〉軸を有する繊維組織がその結果として形成される.
(2) 〈110〉方向が圧延方向と活動すべり方向の間に位置している場合には, 圧延面法線は大円弧 {001}-{112}-{111} に近づき, 一方圧延方向は〈110〉に移動する. そこで {011} 〈111〉すべり系と {112} 〈111〉すべり系による二重すべりが活動しはじめ, 前者は圧延面法線を {112} に向かつて回転させ, 後者は {001} に向かつて逆向きの回転を生ずる.それに対し圧延方向は〈110〉のすぐ近くに留まつている. その結果2つの最終安定方位 {112} 〈111〉と {001} 〈110〉が発達する. しかしながらこの方位変化の途上で広範囲に交差すべりが起こると, {001} と {111} の間に存在する圧延面法線は安定となり, 圧下率が増加するにしたがつて〈110〉軸が圧延方向に平行に配列した部分的繊維組織の発達が起こる.抄録全体を表示PDF形式でダウンロード (2344K) -
美馬 源次郎1968 年 54 巻 6 号 p. 691-709
発行日: 1968/05/01
公開日: 2010/10/12
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顕微鏡組織的な強化因子と強度邦武 立郎1968 年 54 巻 6 号 p. 710-722
発行日: 1968/05/01
公開日: 2010/10/12
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1968 年 54 巻 6 号 p. 723-727
発行日: 1968/05/01
公開日: 2010/12/22
ジャーナル フリーPDF形式でダウンロード (1608K)
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