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冶炼和铸造了不同稀土镁含量的W6Mo5Cr4V2高速钢,并对铸态钢材进行退火及锻打,检测了不同状态下的显微组织,并用Gleeble模拟了钢材的高温性能。结果表明:稀土镁能使铸态W6Mo5Cr4V2钢中网状碳化物组织断裂;随着钢中稀土镁含量的增加和锻打压下量的增大,碳化物粒化度提升;热模拟表明W6Mo5Cr4V2钢的第I高温脆性区为熔点到1180℃,第Ⅱ高温脆性区为950~800℃;综合高温塑性区极窄,为1170~1190℃。
Smelting and casting W6Mo5Cr4V2 high speed steel with different rare earth magnesium content. The as-cast steel was annealed and forged, the microstructure was tested under different conditions, and the high temperature performance of the steel was simulated by Gleeble. The results show that the rare earth magnesium can rupture the network carbides in the as-cast W6Mo5Cr4V2 steel, and the carbide granularity increases with the increase of rare earth magnesium content and the amount of forging reduction. The thermal simulation shows that the W6Mo5Cr4V2 steel The first high temperature brittle zone is the melting point to 1180 ℃, the second high temperature brittle zone is 950 ~ 800 ℃; the comprehensive high temperature plastic zone is very narrow, 1170 ~ 1190 ℃.