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一、前言 M42钢(即W2Mo9Cr4VCo8钢)具有高碳、高钴、低钒的特征。经热处理其硬度易达到HRC69～70,能解决高温合金、马氏体时效钢、沉淀硬化不锈钢等难加工材料的加工问题。我厂M42钢近年来不断增加,但钢中碳化物往往不合格而影响生产。为此,我们研究了Si的作用及对碳化物和性能的影响。二、试验方法试验用钢采用10kg真空感应炉熔炼,其化学成分列于表1。钢锭脱模后按图1(a)工艺退火,然后锻成15mm方料,锻造工艺为:加热温度1170℃,开锻温度1100℃,终锻温度大于950℃。锻后15mm方料按图1(b)工艺退火。进行组织观察和性能测试。三、结果和讨论
First, the preface M42 steel (ie W2Mo9Cr4VCo8 steel) with high carbon, high cobalt, low vanadium characteristics. The heat treatment of its hardness easy to reach HRC69 ~ 70, to solve the high temperature alloys, martensitic aging steel, precipitation hardened stainless steel and other difficult processing of materials processing problems. M42 steel in our plant has been increasing in recent years, but the steel is often unqualified carbide and affect the production. To this end, we have investigated the effect of Si and its effect on carbides and properties. Second, the test method The test steel with 10kg vacuum induction furnace melting, the chemical composition is shown in Table 1. After the strip is stripped, it is annealed according to the process of Fig. 1 (a), then forged into a 15mm square material. The forging process is: heating temperature 1170 ° C, opening temperature 1100 ° C and final forging temperature 950 ° C. After forging 15mm material according to Figure 1 (b) annealing process. Organizational observation and performance testing. Third, the results and discussion