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用-70～-90℃的低温处理刀、模具,以提高使用寿命的方法,早已为人们所掌握。试验表明,在此温度下残余奥氏体并不能十分完善地转变为马氏体.如果能找到把残余奥氏体充分转变为马氏体的方法,刀、模具使用寿命必将大大提高.日本一些工厂对硬质合金、高速钢和含钴高速钢等刀具材料以及高碳轴承钢、合金模具钢、高速工具钢,合金工具钢等模具材料作了深冷处理。其方法是将经常规热处理的刀、模具,放进盛有液氧(或液氮)且与空气隔绝的密闭箱中,深冷到-180～200℃,保温40～50小时,再缓缓回升到室温.试验表明,经过这样深冷处理的刀、模具,能使残余奥氏体充分转
With -70 ~ -90 ℃ low temperature treatment knives, molds, in order to improve the service life of the method, already mastered by people. Tests show that at this temperature residual austenite can not be perfectly transformed into martensite.If you can find the method to fully transform the residual austenite into martensite, knife, mold life will be greatly enhanced. Japan Some factories cryogenic treatment of tool materials such as cemented carbide, high-speed steel and cobalt-containing high-speed steel and mold materials such as high carbon bearing steel, alloy die steel, high speed tool steel, alloy tool steel. The method is that the knife and the mold which are conventionally heat-treated are placed in a sealed box containing liquid oxygen (or liquid nitrogen) and separated from the air, cryogenic to -180 to 200 DEG C, keeping the temperature for 40 to 50 hours, and then slowly Rose to room temperature.Experiments have shown that after such a cryogenic treatment of the knife, mold, the residual austenite can make full turn