Bake hardening behavior of TRIP and DP steels

Jicheng Zhang1), Renyu Fu1), Mei Zhang1,2), Rendong Liu3), Xicheng Wei1), and Lin Li1) 1) School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China 2) Shanghai Huizhong Automotive Manufacturing Co. Ltd., Shanghai 200122, China 3) Ansteel Group Co., Anshan 114021, China

摘 要：The bake hardening （BH） behavior of transformation-induced plasticity （TRIP） and dual-phase （DP） steels after different prestrains was studied. The experimental results indicate that TRIP steel exhibits good BH ability while DP steel does not, and pre-strain displays a strong effect on the BH values of both steels. The comparison of microstructures of the two steels showed that the hard second phase in the matrix might be harmful to the BH ability. For deformed specimens, baking resulted in a loss of uniform elongation, but there was no obvious decrease in uniform elongation for unprestrained specimens.

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