Influence of Grain Size on Continuous Cooling Transformation Rules of a Bainitic Steel SDP1
LI Xiaocheng1,2,3, ZHENG Yafeng1,2,3, WU Xiaochun1,2,3
1 State Key Laboratory of Advanced Special Steel, Shanghai 200072; 2 Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai 200072; 3 School of Materials Science and Engineering, Shanghai University, Shanghai 200072
Abstract: Continuous cooling transformation (CCT) curves of SDP1 with 150 μm and 20 μm grain size were tested by dilatometer. Based on the curves, the effect of grain size on phase transformation, microstructure and hardness of the SDP1 steel were studied by means of OM, SEM, hardness test, thermodynamic calculation and kinetic analysis.The experimental results showed that specimen with smaller grain could display lamellar pearlite in the low cooling rate conditions with hardness about 305HV and had a smaller bainitic transformation zone. The specimen with bigger grain size had no pearlite formation and bainitic transformation zone was larger with hardness about 423HV. The activation energy of bainitic transformation of specimens with grain size of 150 μm and 20 μm were 124 kJ·mol-1 and 134 kJ·mol-1, respectively.
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2017, Vol. 31 
