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1、消除残余奥氏体和应力的冷处理急热法使工件在0℃以下温度进行深冷称为冷处理,包括在-80℃左右进行的一般冷处理,和在-180℃以下进行的深冷处理(Cryogenictreatment)两种。一般冷处理使用干冰和氟利昂气体作为致冷剂,而深冷处理使用液态氮(-196℃)。经过冷处理,残余奥氏体(γR)转变成马氏体,虽然仅可使硬度提高1—2HRC,但可显著提高耐磨性能和抗崩刃性能。特别是
1, cold treatment to eliminate residual austenite and stress Cryogenic method for cryogenic treatment of the workpiece at temperatures below 0 ° C, including general cold treatment at about -80 ° C and cryogenic treatment at -180 ° C or less Cryogenictreatment) two kinds. Cold water and Freon gas are generally used as refrigerants for cold treatment while liquid nitrogen (-196 ° C) is used for cryogenic treatment. After cold treatment, retained austenite (γR) into martensite, although only increased hardness 1-2HRC, but can significantly improve the wear resistance and chipping resistance. especially