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| 不同渗氮温度下38CrMoAl钢低氮氢比无白亮层离子渗氮 |
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陈尧1, 纪庆新1, 魏坤霞1,2, 胡静1,2
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1.常州大学 材料科学与工程学院, 江苏 常州 213164;2.常州大学 材料科学与工程国家级实验教学示范中心, 江苏 常州, 213164
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| 摘要: |
| 为提高变速器锥盘使用寿命，以锥盘用38CrMoAl钢为研究材料，采用不同渗氮温度低氮氢比离子渗氮进行表面改性。利用光学显微镜、X射线衍射仪、显微硬度计、摩擦磨损试验机对渗氮后的38CrMoAl钢显微组织、物相、硬度、渗层脆性及耐磨性进行了测试和分析。结果表明：38CrMoAl钢经520℃，N2∶H2=1∶4和540℃，N2∶H2=1∶5离子渗氮后表层无白亮层生成，XRD分析表明表层无γ'-Fe4N相，说明离子渗氮时通过改变渗氮温度和氮氢比可以避免白亮层生成，只形成渗氮扩散层。研究还发现，渗氮层的脆性显著降低，韧性和耐磨性提高，为促进无白亮层离子渗氮技术更好地应用于变速器锥盘的表面改性提供了参考。 |
| 关键词: 38CrMoAl钢 离子渗氮 氮氢比 渗氮温度 白亮层 |
| DOI：10.11933/j.issn.1007-9289.20171108001 |
| 分类号:TG156.82 |
| 基金项目:国家自然科学基金（51774052）；江苏高校品牌专业建设工程资助项目（TAPP）；江苏省研究生科研与实践创新计划项目（KYZZ16-0246） |
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| Plasma Nitriding Without White Layer for 38CrMoAl Steel with Lower Ratio of N2 to H2 Under Different Temperature |
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CHEN Yao1, JI Qing-xin1, WEI Kun-xia1,2, HU Jing1,2
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1.School of Materials Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu;2.National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu
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| Abstract: |
| To enhance the service-life of the variable transmission's cone disc, a type of commonly used material, 38CrMoAl steel, was selected as the testing material. Plasma nitriding with lower ratio of N2 to H2 at different temperature was used for surface modification. The treated samples were characterized by optical microscopy (OM), X-ray diffraction (XRD), microhardness tester and wear tester. The results show that no white layer is formed by plasma nitriding at 520℃, N2:H2=1:4 and 540℃, N2:H2=1:5, and the XRD confirmes that there exists no γ'-Fe4N phase in the surface layer, which means that only nitriding diffusion layer can be formed by changing the temperature and the nitrogen hydrogen ratio. Meanwhile, it is found that the brittleness of the nitriding layer is decreased and the toughness is improved comparing with those in conventional plasma nitriding. Therefore, the research can be taken as important guidelines in surface modification for variable transmission's cone disc. |
| Key words: 38CrMoAl steel plasma nitriding N2 to H2 ratio nitriding temperature white layer |