影响奥氏体热作模具钢性能的因素

 在700 ℃下，马氏体型热作模具钢难以工作，奥氏体型热作模具钢具有良好的高温强度。基于均匀设计方法，设计了6种不同成分的试验钢及相应的热处理工艺。试验测定了6种钢的硬度、室温冲击韧性、热稳定性，利用二次型逐步回归分析方法对试验结果进行了建模，得出了三者与成分、工艺之间的回归方程，并与H13钢和DIEVAR钢对比。结果表明：增加Si、Mn、V含量，降低Cr、Mo含量可以提高钢的韧性；同时在所设计的热处理工艺范围内可以使钢的室温冲击功达到300 J；在700 ℃保温20 h，硬度HRC减少1~3。

Influencing Factors of Performance for Austenitic Hot Die Work Steel

Martensitic hot die work steel can’t work at 700 ℃,but austenitic hot work die steel has good high temperature strength. Six kinds of test steels and heat treatment process related were designed based on uniform design method.The hardness,room impact toughness and thermal stability were measured. The experiment results were analyzed by quadratic stepwise regression,three models were established to discribe relationship between chemical composition, heat treatment process and mechanical properties and compared with that of H13 and DIEVAR steel.The results show :Si,Mn and V had a tendency to increase room impact toughness, while Cr and Mo had the opposite tendency. Within the range of heat treatment designed, the room impact energy could reach to 300 J, and the hardness only reduced by 1 3HRC after treatment at 700 ℃ for 20 h.