化学成分对冷作模具钢组织的影响

Effect of Chemical Composition on Microstructure of Cold-working Die Steel

以7种不同成分的冷作模具钢为研究对象,分别探讨了Cr、Mo、V、W、Si及稀土元素等对模具钢组织形态的影响。结果表明:Mo、V使钢中碳化物形态分散,且加热时不易溶入奥氏体中,起到细化晶粒、提高韧性的作用;钢中碳化物数量随Cr含量的增加而增加;Si可阻止碳元素溶入钢中,提高钢的回火稳定性;0.05%镧铈合金和0.05%稀土镁可使实验钢莱氏体及共晶碳化物形态更加圆润、不构成网状,可提高钢的热塑性,便于热加工成型。

Based on 7 types of different compositions of cold-working die steel,the effects of Cr,Mo,V,W,Si and RE on the microstructure of the die steel were studied.The results show that element Mo and V make carbide＇s shape scatter and the carbides are difficult to dissolve in austenite,they could refine grain and improve toughness;the content of carbides increases with the increase of Cr content;element Si could prevent carbon form dissolving in the steel and improve the tempering stability of the steel;0.05%La-Ce alloy and 0.05%RE-Mg could make ledeburite and eutectic carbide morphology more round,not constitute a network,which improve the thermoplastic and hot thermo-forming property.