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| Macro and Micro Behaviors of Low Alloyed TRIP780 Steel with Different Biaxial Proportional Loading |
| Hong-yang LI1,2,Yan-jing ZHANG1,Wen-jun ZHAO3,Zhi-fei GU3,Xian-chao LI1,Jin-long MA1 |
1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
2. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing Institute of Technology, Beijing 100081, China
3. Inner Mongolia First Machinery Group Co., Ltd.,Baotou 014032, Inner Mongolia, China |
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Abstract To investigate the macro and micro behaviors of TRIP (transformation induced plasticity) steel under biaxial loading, experiment and finite element simulation were carried out for TRIP780 steel under proportional biaxial tension with displacement ratio of 1��1, 2��1, 3��1 and 4��1, respectively. The results show that cruciform specimens of TRIP780 steel fractured under proportional biaxial stretching when effective strain was about 1.5%, and fracture was always generated on the cross arm or cross links. During biaxial tension, stress and strain components in x and y directions of the center of the samples have the same nonlinear developing tendency, decreasing in one direction and increasing in another direction. Equal biaxial stretching stress state was helpful for retained austenite-martensite transformation than the other biaxial stress state. With increasing displacement ratio (DR) from 1��1 to 4��1, corresponding stress distributed unevenly on the yield ellipse from 30�� to 60�� in the first quadrant of stress space and corresponding retained austenite volume fraction distributed symmetrically in bow tie format.
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Received: 22 October 2013
Published: 06 March 2015
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| Fund:National Outstanding Youth Science Foundation of China |
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Corresponding Authors:
Hongyang Li
E-mail: lihongyang@bit.edu.cn
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2015, Vol. 22 
