2013•steel research internationalRequires access
The Effect of Intercritical Annealing on the Microstructure and Mechanical Properties in a High Strength TRIP Steel with C‐ P artitioning
Chao Wang, Hua Ding, Zhengyou Tang, Jun Zhang, Huafang Di
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Abstract
Direct experimental evidence confirms the partitioning of C to austenite during intercritical annealing is the intrinsic factor that affects the stability of the retained austenite for a newly developed high strength transformation‐induced plasticity (TRIP) steel. The volume fraction of retained austenite and C concentration decreases with increasing intercritical annealing time. Few retained austenite grains and a number of M/A islands were observed in the sample at 830°C annealed for 30 min. When the sample annealed at 830°C for 0.5 min and then isothermally treated at 440°C for 3 min, the investigated low alloy TRIP steel achieved the tensile strength higher than 1000 MPa, the total elongation of 21.8% and the n‐value of 0.32.