An Investigation on the Tensile Property of 10 pct Mn TRIP/TWIP Dual Phase Steels
(0) The mechanical behavior of a 10 pct Mn dual phase steel which belongs to the 3rd-generation AHSS for automotive application is investigated.The 10 pct Mn steels were intercritically annealed from the different amount of partial martensite microstructures.The tensile property for the 10 pct Mn steel with larger amount of initial martensite is significantly better than the counterpart with lower one.The X-ray diffraction(XRD)results show that the austenite volume fraction decreased significantly both in small and large strains for the 10 pct Mn steel with larger amount of initial martensite,confirming the operation of transformation induced plasticity(TRIP)effect in 10 pct Mn steel during tensile test.The significant decrease of austenite volume fraction at small and large strain may be ascribed to the sharp different mechanical stability of the large and small austenite in 10 pct Mn steel.Interestingly,the austenite volume fraction remains still at the medium strain.The transmission electron microscopy(TEM)observation suggests an operation of twinning-induced plasticity(TWIP)effect.Therefore,it is proposed that the TWIP effect may dominate at the medium strain to link the retained austenite grains with different mechanical stability,resulting in an excellent combination of strength and ductility of the 10 pct Mn steel with larger amount of initial martensite.
3rd-generation AHSS medium Mn steel stability of austenite
He Binbin Luo H.W. Huang Mingxin
Department of Mechanical Engineering,The University of Hong Kong,Hong Kong,China State Key Laboratory of Advanced Metallurgy & School of Metallurgical and Ecological Engineering,Uni
国内会议
上海
英文
1-5
2015-10-21（万方平台首次上网日期，不代表论文的发表时间）