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Behavior of Deformation and Fracture of Metallic Materials Under High Magnetic Field and Low Temperatures.

高磁场和低温下金属材料的变形和断裂行为。

基本信息

批准号：
01460220
负责人：
SHIBATA Koji
金额：
$ 4.35万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460220/
关键词：
Cryogenic temperatures High magnetic field Metallic materials Deformation Fracture Martensitic transformation Stress

项目摘要

1. Effects of elastic stress on martensitic transformation in austenitic stainless steels at cryogenic temperatures : In SUS316LN steels, martensitic transformation did not occur. In SUS304L steels, the transformation was enhanced by the stress. The tendency of the enhancement was smaller as the stress increased.2. Effects of duplex application of stress and magnetic field on martensitic transformation in austenitic stainless steels : IN SUS304L steels, the transformation under the stress was enhanced by magnetic field, although clear additional effects of the duplex application has not been observed. In SUS316LN steels, martensitic transformation did not occur under duplex application of 0.2% flow stress and magnetic field up to 8 Tesla.3. Effects of plastic deformation and magnetic field on martensitic transformation at cryogenic temperatures : The amount of martensite induced by plastic deformation was increased by magnetic field. The increment was larger in austenitic stainless steels then in Fe-Ni binary Unvar steels. The difference between these steels was attributable to the fact that alpha' martensite transformed not only from gamma but also from epsilon in the stainless steels.4. Effects of magnetic field on serrated deformation at cryogenic temperatures : Amplitude of serration increased in both austenitic stainless and Unvar steels. This phenomenon was attributable to the increase in yield strength by the application of magnetic field. It was suggested by computer simulation that effect of latent heat of martensitic transformation on the serrated deformation was not large.

1.弹性应力对奥氏体不锈钢低温马氏体相变的影响：在SUS 316LN钢中，没有发生马氏体相变。在SUS 304 L钢中，应力促进了相变。随着应力的增加，增强的趋势变小.应力和磁场的双重应用对奥氏体不锈钢马氏体相变的影响：在SUS 304 L钢中，应力下的相变被磁场增强，尽管尚未观察到双重应用的明显附加效应。在SUS 316LN钢中，在0.2%的流动应力和高达8特斯拉的磁场的双重施加下，没有发生马氏体相变。塑性变形和磁场对低温马氏体相变的影响：磁场使塑性变形诱发的马氏体数量增加。奥氏体不锈钢中的增量大于Fe-Ni二元Unvar钢。这些钢之间的差异是由于α马氏体不仅从γ马氏体转变，而且从不锈钢中的γ马氏体转变。低温下磁场对锯齿形变的影响：奥氏体不锈钢和Unvar钢的锯齿幅度都增加了。这一现象是由于施加磁场使屈服强度增加。计算机模拟表明，马氏体相变潜热对锯齿形变形的影响不大。