Influence of Ti on Grain Growth Behavior of Non-quenched and Tempered Plastic Mold Steel
ZHENG Yafeng1,2,3, LI Xiaocheng1,2,3, WU Riming1,2,3, WU Xiaochun1,2,3
1 State Key Laboratory of Advanced Special Steel Shanghai University, Shanghai 200072;
2 Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University, Shanghai 200072;
3 School of Materials Science and Engineering, Shanghai University, Shanghai 200072
Abstract: The demand of automotive and appliance industry for high-quality large section plastic mold steel is gradually increased. However, with the increase of the thickness of plastic mold steel, the possibility of the occurrence of coarse grain is also increased, which calls for a reasonable design of heat treatment process. The austenite grain growth behavior during high temperature treatment was hindered by adding titanium, and the effects of Ti addition on austenite grain growth behavior of non-quenched and tempered (NQT) plastic mold steel were emphatically studied. The results show that the NQT plastic mold steel containing 0.03% Ti has better resistance to grain coarsening when the homogenization temperature is higher than 1 050 ℃, due to the Ti(C, N) precipitation disperse around the grain boundaries. Based on the experimental results, the mathematical models of grain growth were established, which can be used to predict the austenite grain growth of NQT plastic mold steel during high temperature homogenization.
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2017, Vol. 31 
