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一、回火定义的讨论回火是指钢淬火后加热到临界点(Ac_1)以下的某一温度,保温一定的时间,然后以适当的速度冷至室温的热处理工艺的总称。通常所谓低、中、高温回火是泛指碳钢和合金结构钢,在回火后分别获得回火马氏体、屈氏体、索氏体组织的的回火规范。高速钢550±10℃回火从温度上看似乎属高温回火范畴,但从回火后获得回火马氏体组织看,
First, the definition of tempering tempering refers to the steel quenched after heating to a critical point (Ac_1) below a certain temperature, heat a certain period of time, and then cooled to room temperature at an appropriate rate of heat treatment process. The so-called low, medium and high temperature tempering is generally refers to the carbon steel and alloy steel, respectively, after tempering were tempered martensite, troostite, sorbite tempering specifications. High-speed steel 550 ± 10 ℃ tempering temperature seems to belong to the category of high-temperature tempering, but tempered martensite obtained after tempering,