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Acta Metall Sin  2014, Vol. 50 Issue (4): 498-506    DOI: 10.3724/SP.J.1037.2013.00559
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FINITE ELEMENT SIMULATION OF THE EFFECT OF STRESS RELAXATION ON STRAIN-INDUCED MARTENSITIC TRANSFORMATION
FENG Rui, ZHANG Meihan, CHEN Nailu, ZUO Xunwei, RONG Yonghua
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240
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Abstract  Near 50 years ago, transformation induced plasticity (TRIP) effect was proposed and TRIP steels as an advanced high strength one are widely investigated. However, the mechanism of TRIP effect can be only qualitatively explained, and has not been experimentally and theoretically verified so far. In this work, a strain equivalent model for strain-induced martensitic transformation was built in a microstructure-based finite element model of novel quenching-partitioning-tempering (Q-P-T) steel. With the model, the TRIP effect under the condition of uniaxial tension was simulated, from which the micro-mechanism of TRIP effect is revealed. Stress relaxation from TRIP relieves the stresses within untransformed retained austenite and its adjacent martensite and blocks the formation of cracks, meanwhile, a considerable retained austenite still exists at higher strain level, which is the origin of TRIP effect. Compared with original (thermal-induced) martensite, fresh (strain-induced) martensite bears higher stress. Therefore, it could be predicted that cracks form at first in fresh martensite or its boundaries. Moreover, stress relaxation makes strain-induced martensite formed in intermittent and slow way, and this is consistent with experimental results. However, in stress-free relaxation state fresh martensite appears in successive and quick way, not consistent with experiments, and thus this verifies in opposite way that TRIP effect inevitably produces stress relaxation.
Key words:  quenching-partitioning-tempering (Q-P-T) steel      transformation induced plasticity (TRIP)      finite element simulation      stress relaxation      uniaxial tension     
Received:  05 September 2013     
ZTFLH:  TG142  
Fund: Supported by National Natural Science Foundation of China (Nos.51031001 and 51371117)
Corresponding Authors:  RONG Yonghua, professor, Tel: (021)54745567, E-mail: yhrong@sjtu.edu.cn   

Cite this article: 

FENG Rui,ZHANG Meihan,CHEN Nailu,ZUO Xunwei,RONG Yonghua. FINITE ELEMENT SIMULATION OF THE EFFECT OF STRESS RELAXATION ON STRAIN-INDUCED MARTENSITIC TRANSFORMATION. Acta Metall Sin, 2014, 50(4): 498-506.

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00559     OR     https://www.ams.org.cn/EN/Y2014/V50/I4/498

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