标题：Friction and wear behaviors of gas nitriding and quenching compound treatment of GCr15 steels
作者：Zhang, Guo-Song ;Cui, Hong-Zhi ;Cheng, Gui-Qin
作者机构：[Zhang, Guo-Song ;Cui, Hong-Zhi ] School of Materials Science and Engineering, Shandong University of Science and Technology, QingDao; Shandong; 26659 更多
来源：Zhongguo Biaomian Gongcheng/China Surface Engineering
摘要：Gas nitriding-quenching (N+Q) compound treatments on GCr15 steel were carried out and compared with single processing of gas nitriding and quenching. The phases, microstructures, and the dry sliding friction properties of samples were studied. By single gas nitriding at 530℃ for 9 h, the compound layer was composed of Ε phase with a thickness of about 40 μm. However, the nitride of Ε phase in the compound layer were completely decomposed in N+Q compound treatment, which promoted N element to diffuse into the matrix, and the thickness of the diffusion region was about 900 μm. Compared with the single quenching hardness of GCr15 steel, the hardness of diffusion region was improved about 200 HV0.1, because of soluble N element. However, the surface hardness dropped down, due to the porosity resulting from the decomposition of nitrides. Furthermore, under the loads of 20 N and 100 N, the dry reciprocating sliding frictions were carried out respectively. The results show that the friction co-efficients (COF) of both single gas nitriding and N+Q compound processing are lower than that of single quenching treatment. The wear resistances of N+Q compound treatment samples are improved, compared with nitriding and quenching samples at a load of 20 N, and decreases at a load of 100 N due to the surface porosity during initial steps. However, after the initial steps, the anti-wear ability of N+Q compound treatment samples increases again.
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