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Effects of Twin-Dislocation and Twin-Twin Interactions on the Strain Hardening Behavior of TWIP Steels 被引量:3
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作者 WANG Shu-han LIU Zhen-yu +3 位作者 WANG Guo-dong LIU Jun-liang LIANG Gao-fei LI Qiu-lin 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2010年第12期70-74,共5页
Tensile tests of Fe-30Mn-5Si-2Al steel were carried out for different strains of 0.05, 0.14, 0.26, and up to the strain-to-failure in order to observe the evolution of microstructure during deformation and investigati... Tensile tests of Fe-30Mn-5Si-2Al steel were carried out for different strains of 0.05, 0.14, 0.26, and up to the strain-to-failure in order to observe the evolution of microstructure during deformation and investigating the strain hardening behavior. Three-stage strain hardening behavior was observed in this steel during tensile test. In stage I , planar dislocation structure was observed by TEM and regarded as main deformation mechanism, and low strain hardening rate exponent was exhibited. Primary deformation twinning occurred in stage II , and the strain hardening rate exponent increased due to the blockage of dislocations' motion by twin boundaries. In stage III , the strain hardening rate exponent had increased to a value higher than 0.5. The obstacle effect of twin boundaries and twin-twin interact'ion had been observed by TEM, and the interactions between primary and secondary twins were found to cause the additional hardening in addition to the obstacle effect on dislocations' motion, which led to the twinning induced plasticity effect in the later stage of deformation. 展开更多
关键词 TWIP steel strain hardening TWIN DISLOCATION
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