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Realization of High-performance Materials Through Control of Mezoscopic Structure of Materials

通过控制材料的介观结构实现高性能材料

基本信息

批准号：
10555031
负责人：
TOMIMTA Yoshihiro
金额：
$ 4.29万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

1.By means of precise tension tests conducted at the environmental temperatures of 77K to 373K, the constitutive equation that models for martensitic transformation depending on strain rate, temperature and applied stress system, was established.2.The computational strategy for the prediction of the deformation behavior of TRIP steels was then developed using the established constitutive equation3.Through comparison between the computationally predicted stress-strain relation for 77K and 293K, the validity of the proposed constitutive equation in predicting macroscopic nature of deformation behavior was verified. The local distribution of the martensitic phase over the ringed-notched specimen deformed under tension at 77K was predicted computationally and compared with the values obtained by a specially arranged experimental procedure using the micro-hardness testing device. The good correspondence between the two results confirms the validity of the present computational strategy.4.A computational simulation of the deformation behavior of TRIP steel bars without/with the ringed notch under uniaxial tension at 77K was performed. The accuracy of the computational results was verified through the comparison against the experimental results.5.A sort of inverse method was used to control the deformation processes to realize the improvement of the mechanical property of materials.

1.通过77 ~ 373 K环境温度下的精密拉伸试验，建立了马氏体相变与应变速率、温度和外加应力系统的关系模型，2.利用所建立的TRIP钢的本构方程，提出了预测TRIP钢变形行为的计算策略通过77 K和293 K的应力-应变关系，验证了所提出的本构方程在预测宏观变形行为方面的有效性。通过计算预测了在77 K下拉伸变形的环形缺口试样上马氏体相的局部分布，并与使用显微硬度测试装置的特别安排的实验程序所获得的值进行了比较。两个结果之间的良好的对应关系证实了本计算策略的有效性。4.对TRIP钢棒在77 K下的单向拉伸变形行为进行了数值模拟。通过与实验结果的对比，验证了计算结果的准确性。5.采用一种逆方法来控制变形过程，实现材料力学性能的改善。