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通过对镶铸高速钢-碳钢双金属耐磨材料在不同工作温度下的组织性能变化的研究,探讨了镶铸高速钢-碳钢双金属耐磨镶块的回火稳定性。针对在不同工作温度下高速钢镶块碳化物形态变化的情况安排适当的热处理工艺,以达到改善高速钢镶块碳化物形态的目的。实验结果表明,随回火温度升高,网状碳化物聚集长大,增加耐磨件的脆性,在使用过程中,如有冲击载荷的作用,易产生裂纹。采用热处理工艺为870℃退火+1 270℃淬火+560℃回火,满足镶铸件在高温粘着磨损条件下使用。
Based on the study of the microstructure and properties of the in-mold high speed steel-carbon steel bimetallic wear-resistant materials at different working temperatures, the tempering stability of the bored high-speed steel-carbon steel bimetallic wear-resisting inserts was discussed. Aiming at the change of carbide shape of high speed steel inserts at different working temperatures, an appropriate heat treatment process is arranged to improve the carbide shape of high speed steel inserts. The experimental results show that with the increase of tempering temperature, the network carbides gather to grow and increase the brittleness of the wear parts. Cracks easily occur if the impact load is applied. The heat treatment process is annealing at 870 ° C, annealing at +1707 ° C and tempering at 560 ° C to meet the conditions of high temperature adhesive wear.