引用本文:张国松,崔洪芝,程贵勤.GCr15钢气体渗氮+淬火复合处理及干摩擦行为[J].中国表面工程,2016,29(6):30~37
ZHANG Guo-song,CUI Hong-zhi,CHENG Gui-qin.Friction and Wear Behaviors of Gas Nitriding and Quenching Compound Treatment of GCr15 Steels[J].China Surface Engineering,2016,29(6):30~37
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GCr15钢气体渗氮+淬火复合处理及干摩擦行为
张国松1, 崔洪芝1, 程贵勤2
1.山东科技大学 材料科学与工程学院, 山东 青岛 266590;2.青州海盾液压机械有限公司, 山东 青州 262500
摘要:
用气体渗氮+淬火（N+Q）复合处理技术对GCr15进行表面强化，并与单纯的气体渗氮、淬火进行比较，系统研究了硬化层的物相、组织结构及干摩擦特性。结果表明：530℃气体渗氮9 h后，渗氮层的化合物层为ε相，厚度约为40 μm；而渗氮之后淬火（N+Q）复合处理使氮化物完全分解，促使N元素向基体扩散，扩散区深约900 μm，N固溶强化作用使得扩散区硬度比淬火硬度约高200 HV0.1，但是因氮化物分解产生孔隙致使表层硬度下降。分别在20 N和100 N载荷进行往复干摩擦试验，气体渗氮与N+Q复合处理都能有效降低摩擦因数。在20 N载荷时，N+Q复合处理试样体积磨损率低于渗氮与淬火试样；而在100 N载荷时，因其表面孔隙，使得初始磨损比淬火试样严重，但是磨损一段时间后耐磨性能提高。
关键词:  淬火  气体渗氮  复合处理  摩擦因数  抗磨
DOI：10.11933/j.issn.1007-9289.2016.06.005
分类号:
基金项目:国家自然科学基金（51272141）；国家高技术研究发展计划（863计划）（2015AA034404）
Friction and Wear Behaviors of Gas Nitriding and Quenching Compound Treatment of GCr15 Steels
ZHANG Guo-song1, CUI Hong-zhi1, CHENG Gui-qin2
1.School of Materials Science and Engineering, Shandong University of Science and Technology, QingDao 266590, Shandong;2.Qingzhou Haidun Hydraulic Machinery Manufacturing Co. Ltd., Qingzhou 262500, Shandong
Abstract:
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.
Key words:  quenching  gas nitriding  compound treatment  friction coefficient  anti-wear
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