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通过制定相应的淬火及回火工艺,研究了T8钢在不同温度淬火回火后的组织转变过程。应用金相显微镜和扫描电子显微镜对热处理后的组织进行观察,并且应用洛氏硬度计对试样的宏观硬度进行测量。经过试验可知:T8钢最佳淬火温度为850℃,温度过高和过低都是不可取的;随着回火温度的升高,T8钢回火组织依次以回火马氏体、回火托氏体和回火索氏体进行演变;试样在回火后的硬度先升高后下降,在200℃回火时的硬度达到最大值,这是由于马氏体中碳原子的偏聚以及大量弥散的ε-碳化物析出造成的。
Through the development of the corresponding quenching and tempering process, the T8 steel quenching and tempering at different temperatures after the organizational transformation process. The microstructure after heat treatment was observed by using optical microscope and scanning electron microscope, and the macroscopic hardness of the sample was measured by Rockwell hardness tester. After the test we can see: T8 steel quenching temperature of 850 ℃, the temperature is too high and too low are not desirable; with the tempering temperature, tempering T8 steel followed by tempering martensite, tempering The hardness of the sample after tempering first increased and then decreased, the hardness reaches the maximum when tempering at 200 ℃, which is due to the segregation of carbon atoms in the martensite As well as a large amount of dispersed ε-carbides precipitated.