Transactions of Materials and Heat Treatment

Title：Effect of heating rates on microstructure and bake hardening behavior of DP steel

Authors： Sun Hongyun Meng Qingge Xu Dechao Hu Wenbin

Unit： Shanghai JiaoTong University

KeyWords： heating rate DP steel bake hardening behavior internal friction

ClassificationCode：

year,vol(issue):pagenumber：2014,39(4):115-121

Abstract：

The continuous annealing simulation of dual-phase (DP) steel (0.1C-0.2Si-1.3Mn) under different heating rates(5-350 ℃·s-1) was conducted using self-developed rapid heat treatment equipment. The effect of heating rate on microstructure and bake hardening behavior was investigated using SEM,TEM and internal friction instrument. It is found that the grain size is minimized,the volume fraction of martensite has increasing tendency with the heating rate increasing and the BH Value is improved from 62 to 82 MPa. Based on the analysis, the main factors for BH value improvement under faster heating state are higher dislocation density caused by higher heating rate and the pinning effect of epsilon carbide precipitated during baking stage when the rtensite volume is higher,and higher heating rate had a strong effect on BH value.

Funds：

十二五国家科技支撑计划项目(2011BAE13B01,2011BAE13B03)

孙红云（1989-），女，硕士研究生

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