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用三指数不等的晶面族衍射峰的重心法测定了6—5—4—2高速钢经淬火和180—650℃多次回火后马氏体(α′—相)的正方度;发现低温回火析出碳使正方度下降之后,450℃以上α′—相的c/α比值重新升高,在500—520℃达到极大值。x射线定相分析得出,330℃至45O℃范围内析出了M_3C,但到500℃消失,直到600℃以上回火才能明确判定标志合金碳化物(MC)的衍射峰之出现。在520—600℃,{110}α′峰出现不对称的边带。讨论了上述现象的原因及对研究高合金马氏体二次硬化的意义。
The squareness of the martensite (α’-phase) of 6-5-4-2 high-speed steel after quenching and 180-650 ℃ tempering was measured by the gravimetric method with diffraction peaks of crystal facets with unequal three indices. After low-temperature tempering precipitated carbon to decrease the squareness, the c / α ratio of the α’-phase above 450 ℃ increased again and reached a maximum at 500-520 ℃. X-ray phase analysis showed that M_3C precipitated in the range of 330 ° C to 45 ° C, but disappeared at 500 ° C. It was not until the temperature above 600 ° C that the diffraction peaks of the marked alloy carbide (MC) were clearly determined. At 520-600 ° C, asymmetric sidebands appear in the {110} α ’peak. The reasons of the above phenomenon are discussed and the significance for the study of secondary hardening of high-alloy martensite is discussed.