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众所周知X12M钢在铸造状态下具有苯氏体类型的组织。共晶体在锻造时被打碎,锻造及退火后的组织为索氏体型的珠光体和过剩的合金碳化物。淬火后的组织为马氏体和残余奥氏体及过剩碳化物,残余奥氏体的含量随淬火温度的提高而增加。据资料介绍,当淬火温度为1050℃时,残余奥氏体的含量为12%左右,淬火温度为1180℃时,残余奥氏体的含量即增至95%左右。X12M钢用于冷冲模热压模及滚丝轮等工具,目前工厂中对该材料热处理时采用的淬火温度一般为950～1040℃,致使工件的红硬性差寿命低。我厂过去对该材料制成的滚丝轮,系采用1040℃淬火,200℃低温回
It is well-known that X12M steel has a bainitic structure when cast. The co-crystals are shattered during forging, the forged and annealed tissues are sorbite-type pearlite and excess alloy carbides. After quenching the organization of martensite and residual austenite and excess carbide, the content of retained austenite increases with the quenching temperature. According to the information, when the quenching temperature is 1050 ℃, the content of retained austenite is about 12% and the quenching temperature is 1180 ℃, the content of retained austenite increases to about 95%. X12M steel for cold stamping die and rolling wheel and other tools, the factory in the heat treatment of the material used when the quenching temperature is generally 950 ~ 1040 ℃, resulting in the poor work hard red low life expectancy. I plant in the past on the material made of rolling wheel, the Department of quenching 1040 ℃, 200 ℃ low back