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分别采取铸造和喷射成形两种工艺制备含铌高速钢W6Mo5Cr4V2(M2-Nb)。结合锻后合金在热处理过程中的室温硬度与显微组织的关系,确定两种高速钢相应的最佳淬火及回火温度,以及在此基础上重点对比分析了两者在各自最佳热处理制度下的高温性能。结果表明:由于M2-Nb沉积态组织由均匀细小的等轴晶组成,碳化物沿晶界均匀分布,其锻件在经1180℃淬火,并在560℃下进行3次回火热处理后,不仅室温硬度较最佳热处理条件下的铸锻高速钢高出2.6 HRC,高温性能也更加优异。
Casting and injection molding are respectively adopted to prepare Nb-Nb high-speed steel W6Mo5Cr4V2 (M2-Nb). Based on the relationship between the room temperature hardness and the microstructure of the alloy after forging treatment, the optimum quenching and tempering temperatures of the two kinds of high speed steels were determined. On the basis of the analysis, the best heat treatment conditions Under the high temperature performance. The results show that the as-deposited microstructure of M2-Nb consists of uniform and fine equiaxed grains and the carbides distribute uniformly along the grain boundaries. After quenching at 1180 ℃ and tempering heat treatment at 560 ℃ for 3 times, not only the room temperature hardness It is 2.6 HRC higher than the cast forging HSS under the best heat treatment conditions, and the high temperature performance is more excellent.