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采用高温金相显微镜可以对各种金属材料在高温下的组织进行直接观察,也可对相变,再结晶及晶粒长大过程进行连续跟踪观察和研究。高温金相观察也为钢的奥氏体晶粒度测定提供了一种新的测试方法。因为在奥氏体晶界处聚集有较多的杂质和空穴,当试样在真空下加热表面原子蒸发时,晶界处迅速发生选择性蒸发,形成沟槽,所以可在显微镜下清楚的观察到奥氏体晶界及晶粒大小。
The use of high-temperature metallurgical microscope can be a variety of metal materials at high temperatures directly observe the organization, but also on the phase transition, recrystallization and grain growth process for continuous follow-up observation and research. High-temperature metallographic observation also provides a new test method for the austenitic grain size determination of steel. Because of the accumulation of more impurities and holes in the austenite grain boundaries, selective evaporation occurs rapidly at the grain boundaries as the sample heats under vacuum and heats the surface atoms, forming trenches that are clearly visible under the microscope Austenite grain boundaries and grain size were observed.