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一、前言在GCr15轴承钢中,马氏体基体含碳量控制在0.5%左右,具有细小的奥氏体晶粒,并且剩余碳化物颗粒细小、均匀分布且圆整度好,这些都有利于提高轴承使用寿命,并已成为轴承行业热处理工艺发展的目标。关于剩余碳化物颗粒的大小、形状与分布,它与淬火前预备组织中碳化物的大小、形状与分布有关。为了得到理想的球化组织,还须改变球化前的原始组织,球化前的原始组织一般有珠光体、贝氏体和马氏体等几种。轴承套圈辗压以后的毛坯,为了易于进行切削加
I. Introduction GCr15 bearing steel, the martensite matrix carbon content controlled at about 0.5%, with small austenite grains, and the remaining carbide particles small, uniform distribution and good roundness, which are conducive to Improve bearing service life, and has become the bearing industry heat treatment process development goals. Regarding the size, shape and distribution of remaining carbide particles, it is related to the size, shape and distribution of carbides in the pre-quenched microstructure. In order to obtain the ideal nodular organization, it is also necessary to change the original structure before the nodulizing. There are several kinds of primitive organizations such as pearlite, bainite and martensite before the nodulizing. After the bearing ring rolling blank, in order to facilitate the cutting plus