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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。
The cold die steel SDC99 was quenched at 1030 ℃ and then subjected to low temperature treatment at -130 ℃ for different time. The influence of low temperature treatment on the wear resistance of SDC99 steel was studied by means of friction and wear test. XRD and internal friction analysis The effect of low temperature treatment on the microstructure of SDC99 steel at different times was explored. The diffusion mechanism of carbon atoms after cryogenic treatment was explored by three-dimensional atom probe (3DAP). The results show that after the low temperature treatment at -130 ℃, the wear amount of SDC99 steel decreases, most of the retained austenite changes to martensite, but it can not completely change. After low temperature treatment, some carbon atoms have short-range diffusion and produce carbon segregation. Residual austenite to martensite transformation and carbon segregation can improve the wear resistance of SDC99 steel.