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本文采用高温金相显微镜观察了四种低合金超高强度钢(40SiMnCrNiMoV、37SiMnCrNi-MoV、45CrMnMoV、28Cr3SiNiMoWV)在高温下的晶界行为及其与碳化物溶解的关系,结果表明,在较低的温度时,晶粒以晶界推移的方式长大,其推移距离与时间可列为简单的指数关系(S=kt~N)。温度升高到某一数值时(因不同钢种而异),出现晶界突发现象,即数个晶粒合并在一起,新晶界横跨数个晶粒突然出现。这种晶界突发对消减晶界杂质偏聚,提高显微成分均匀化程度,改善钢的韧性有着重要的作用,
In this paper, high temperature microscopy was used to observe the grain boundary behavior and the relationship with the dissolution of carbides of four kinds of low alloy super high strength steels (40SiMnCrNiMoV, 37SiMnCrNi-MoV, 45CrMnMoV, 28Cr3SiNiMoWV) at high temperature. At the temperature, the grain grows by way of the grain boundary. The distance and time of the grain can be listed as a simple exponential relationship (S = kt ~ N). Temperature rise to a certain value (due to different types of steel), there is a sudden phenomenon of grain boundaries, that is, several grains together, the new grain boundaries suddenly appear across several grains. This sudden break in the grain boundary plays an important role in reducing the segregation of grain boundary impurities, improving the homogenization of the microstructure and improving the toughness of the steel.