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利用场发射扫描电镜及高分辨透射电镜、能谱分析等手段,对DM钢与H13、3Cr2W8V钢热稳定性进行测定及其微观组织的观察。结果表明,随着温度的提高和保温时间的延长,DM钢的硬度始终高于H13和3Cr2W8V钢,表现出优越的热稳定性能。其主要原因是DM钢在热稳过程中析出亚稳θ相,在高温下析出M2C型碳化物,起到二次硬化作用,保证了DM钢的高温强度和硬度。
The thermal stability of DM steels and H13,3Cr2W8V steels were measured and their microstructures were observed by means of field emission scanning electron microscopy, high resolution transmission electron microscopy and energy spectrum analysis. The results show that with the increase of temperature and holding time, the hardness of DM steel is always higher than that of H13 and 3Cr2W8V steel, showing excellent thermal stability. The main reason is that DM steel precipitates metastable θ phase in the process of thermal stability and precipitates M2C carbides at high temperature, which plays the role of secondary hardening to ensure the high temperature strength and hardness of DM steel.