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高速連鋳−直送圧延時の鋳片表面割れ発生臨界条件の定量化と防止法の開発

高速连铸-直轧过程中板坯表面裂纹发生临界条件的量化及预防方法的开发

基本信息

批准号：
09650802
负责人：
鈴木幹雄
金额：
$ 1.98万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

鉄鋼製造プロセスにおける省エネルギー、資源リサイクル技術の一つが鋳造-圧延直結化プロセスである。この技術の安定化のためには連続鋳造鋳片の表面割れの防止が不可欠である。本研究の目的は、表面割れ発生時の限界歪みの測定方法の開発である。温度傾斜場引張試験機を用いて、角棒状試験片(10mm幅×20mm厚×140mm長さ)の厚さ方向に温度勾配を付け[加熱面を延性温度(1100℃)、冷却面を脆性温度(700-950℃)]、10^<-4>/sの歪み速度で引張り加工を行った。冷却面に8mm間隔(標点間距離)で2本の線を刻印し、5秒毎にデジタルカメラで撮影し、画像上で標点間距離を測定して、引張り試験中の変位と歪みを求めた。また、割れ発生時の歪みの決定のため、5秒毎の歪み増分を引張り時間でプロットすると、ある時間tcを境にして歪み増分が急増することが分かった。tcの前後で試験を停止し、試験片の冷却面側に割れが有るかどうかを調べた。tcより前では割れは無く、後では割れが認められた。従って、tcを求めることにより割れ発生時の歪みを求めることができる。この方法を用いて、中炭素包晶鋼(炭素濃度0.1-0.16mass%)の連鋳スラブの表層部から切り出した試験片を使って横割れ発生時の限界歪みを測定した。試験片にはオッシレーションマークを模してV状のノッチを付けた。得られた結果を次に示す。(1)実験に用いた3種類の中炭素包晶鋼の熱間延性は800℃で最小を示し、Nbを含有すると脆化温度が高温側に拡大する。脆化温度は700〜950℃の範囲である。(2)ノッチの無い場合の限界歪みは35%であるが、0.3mm深さのノッチの場合の限界歪みは15%まで急激に低下する。ノッチ深さが増して1.5mm深さになると約10%まで低下する。V字状と半円状ノッチを付けて限界歪みに及ぼす形状の影響を調べたが、形状の影響は認められなかった。

In order to improve the quality of the information system, the information system and the information system. The technology is stabilized, the production is connected, the surface is cut, and the non-negotiable equipment is prevented. The purpose of this study is to evaluate the accuracy of the method for the determination of the time limit of surface cutting. The temperature skew field test machine uses the wire, the angle bar (10mm width × 20mm thickness × 140mm length) the temperature in the thickness direction is matched with the ductility temperature (1100 ℃) of the added surface, the brittleness temperature of the cooling surface (700C-950C), and the 10 ^ & lt;-4>/s warp speed leads to the processing line. Cooling surface "8mm" interval (mark point distance) 2 books "engraving", 5 seconds "marking" distance "" shadow "," mark point "distance" measurement "" on the portrait "," wrong "position in" guide "" to seek ". When you were born, you decided to make a decision, and when you were born, you made a decision, and when you were born, you made a decision, and when you were born, when you were born, you decided to make a decision, and when you were born, you didn't make a decision, and when you were born, you didn't make a decision, and when you were born, you didn't make a decision, and when you were born, you didn't make a decision, and when you were born, you didn't make a decision, and when you were born, you didn't make a decision, and when you were born, you didn't make a decision, and when you were born, you didn't make a decision, and when you were born, you didn't know what to do, and when you were born, you didn't know what to do, and when you were born, you didn't know what to do, and when Before and after the tc, the cooling surface is cut, and the cooling surface is cut. The tc system is free in front of the computer, but it is not in the back. Please make sure that you do not want to pay any attention to your health. When you are living, you should ask for information about your health. Tc should ask you to make mistakes. In this method, the carbon peritectic (carbon content 0.1-0.16%) is used to determine the temperature of the cross-cutting machine. I don't know what to do. I don't know. I don't know what to do. You have to check the results and show them every time. The main results are as follows: (1) the ductility of carbon peritectic alloy is measured at 800C, and the temperature of brittleness, high temperature and high temperature is high in Nb alloy. The embrittlement temperature is in the range of 700 ℃ and 950 ℃. (2) the limit is skewed by 35% and 0.3mm by 15% and 15% respectively. I don't know. 1.5mm, I don't know. The V shape is half-shaped, the limit is crooked, and the shape is shaped.