将SDC99冷作模具钢在1030℃淬火之后在-130℃进行不同时间的低温处理,利用摩擦磨损试验研究了低温处理对SDC99钢耐磨性的影响规律,采用X射线衍射(XRD)和内耗分析了低温处理不同时间对SDC99钢微观组织的影响,并通过三维原子探针(3DAP)探究低温处理之后碳原子的扩散机制.结果表明:经过-130℃低温处理之后,SDC99钢磨损量降低,大部分残留奥氏体转变为马氏体,但不能完全转变;低温处理之后发现部分碳原子存在短程扩散,产生碳偏聚.残留奥氏体向马氏体转变和碳偏聚均可以改善SDC99钢的耐磨性.
SDC99 cold work die steel was cryogenic treated at-130 ℃ for different time after quenched at 1030 ℃,and the influence of cryogenic treatment on wear resistance of the SDC99 steel was studied by using the friction and wear test.The influence of cryogenic treatment time on microstructure of the steel was analyzed by means of X-ray diffraction (XRD) and internal friction analysis,and the diffusion mechanism of carbon atoms after cryogenic treatment was studied by three dimensional atom probe (3DAP).The results show that after cryogenic treated at-130 ℃,wear mass loss of the steel decreases,and cryogenic treatment promotes most of retained austenite transforms to martensite.At the same time,part of the carbon atoms diffuse in short distance,resulting in carbon segregation.The wear resistance of the SDC99 steel is improved as a result of retained austenite transforming to martensite and carbon segregation after cryogenic treatment.
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