Compound surface-modification technique combined DLC film coating and martensitic trasnformation with dispersed-precipitated carbonitrides

以高含氮碳氮化Cr-Mo钢为材料，研究了真空碳氮化马氏体相变与DLC膜涂层相结合的复合表面改性技术。对Cr-Mo钢进行真空碳氮淬火，得到极细的马氏体，具有溶质氮、残余奥氏体、弥散析出的CrN、Fe4N和Fe3C。滚动点蚀疲劳试验结果表明：DL膜（线性离子源LIS法沉积）、si掺杂DLC膜涂层和氮注入（等离子体离子注入PBII法和沉积PBIID法）均能提高氮含量为0.41 ~ 0.55%的真空碳氮化钢的点蚀耐久性，尤其是在赫兹压力（Pmax）大于4.2GPa的情况下。

A hybrid surface-modification technique with a combination of vacuum carbonitrided martensitic-transformation and a DLC film coating was investigated using Cr-Mo steel designed for carbonitriding to high nitrogen content.Very fine martensite having solute-nitrogen, retained austenite, dispersed-precipitated CrN, Fe4N and Fe3C, was obtained by vacuum-carbonitrided-quenching of the Cr-Mo steel.The results of a roller-pitting fatigue test show that each of a DL film (deposited by linear-ion-source:LIS method), a Si-doped DLC film coating and nitrogen-implantation (performed by plasma-based ion implantation; PBII, and deposition; PBIID methods) improve the pitting endurance of the steel vacuum carbonitrided with a nitrogen content of 0.41-0.55%, especially under a Hertz's pressure (Pmax) of more than 4.2GPa.