离子渗硫模具钢的摩擦磨损机理研究

对模具钢5CrNiMo进行低温离子渗硫处理，表现得到了厚约10μm的渗硫层。在MM－200型摩擦磨损试验机上进行了渗硫层干摩擦条件下的摩擦学试验。利用原子力显微镜（AFM）和扫描电镜（SEM）观察了渗硫层的表面、截面与磨痕形貌；利用X射线衍射仪（XRD）分析了渗硫层的相结构；利用扫描俄歇微探针（SAM）分析了表面元素沿深度的分布。渗硫层表面多孔且不平，由纳米尺度的微粒随机叠嵌而成。渗硫层的纳米结构有利于改善其减摩耐磨性能。摩擦磨损结果表明，模具钢渗硫层的摩擦学性能明显优于未渗表面。

Study on the Mechanisms of Anti-friction and Wear-resistance of Sulfurized Die-steel

Iron sulfide (FeS) layer was prepared on the die steel 5CrNiMo surface by means of low temperature ion sulfuration technology The tribological properties of sulfurized die steel were investigated on the ball on disc tester of model MM 200 under dry sliding condition SEM and AFM were adopted to analyze the morphologies of surface, cross section and wear scars of the FeS layer The phase structure was studied by XRD The SAM was utilized to analyze the surface element distribution with depth It can be found that the surface of FeS layer was porous and uneven,and formed randomly by nano scale grains with diameter of 30 80 nanometers The nano structure was in favor of the improvement of friction reduction and wear resistance The results showed that the tribological properties of sulfurized die steel were superior to that of the original die steel