引用本文:麻恒,罗琪,魏坤霞,周正华,胡静.添加微量硼对离子渗氮渗层组织性能的影响*[J].中国表面工程,2022,34(2):170~175
MA Heng,LUO Qi,WEI Kunxia,ZHOU Zhenghua,HU Jing.Effect of Trace Boron Addition on the Microstructure and Properties of Plasma Nitriding Layer[J].China Surface Engineering,2022,34(2):170~175
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添加微量硼对离子渗氮渗层组织性能的影响*
麻恒1,2, 罗琪1,3, 魏坤霞1,2, 周正华1,3, 胡静1,2,4
1.常州大学江苏省材料表面科学与技术重点实验室 常州 213164;2.常州大学怀德学院 常州 213164;3.常州大学材料科学与工程国家级实验教学示范中心 常州 213164;4.常州大学江苏省光伏科学与工程协同创新中心 常州 213164
摘要:
以 42CrMo 钢为材料，探索添加微量硼对离子渗氮效率和渗层组织性能的影响。利用光学显微镜、X 射线衍射仪(XRD)、 显微硬度计、摩擦磨损测试仪等仪器对截面显微组织、物相、截面硬度、渗层韧性以及耐磨性等性能进行测试和分析。研究结果表明，离子共渗可显著提高渗氮效率，在相同离子渗氮工艺 520 ℃保温 6 h 条件下，化合物层厚度随 B 添加量增加逐渐加厚，由常规离子渗氮处理后的 18.78 μm 增加到 29.44 μm；同时硼氮离子共渗后在化合物层与扩散层相连处形成了锯齿状垂直楔入基体的硼铁化合物 FeB 和 Fe2B，达到增强渗层与基体结合力及提高渗层硬度的显著效果。随 B 添加量增加，试样表面硬度和有效硬化层深度都逐渐提高，表面硬度可由常规离子渗氮的 750 HV0.05提高至 100 2 HV0.05；有效硬化层厚度由常规离子渗氮的 265 μm 增加到 355 μm，相当于渗氮效率提高约 35%。硼氮离子共渗处理后试样耐磨性和渗层韧性明显高于常规离子渗氮。
关键词:  42CrMo 钢  硼氮离子共渗  硼  渗层  耐磨性  韧性
DOI：10.11933/j.issn.1007-9289.20210421001
分类号:TG178
基金项目:国家自然科学基金(51774052，21978025)；江苏省第三期优势学科建设项目(PAPD-3)；江苏高校品牌专业建设工程(TAPP)资助项目
Effect of Trace Boron Addition on the Microstructure and Properties of Plasma Nitriding Layer
MA Heng1,2, LUO Qi1,3, WEI Kunxia1,2, ZHOU Zhenghua1,3, HU Jing1,2,4
1.Jiangsu Key Laboratory of Materials Surface Science and Technology,Changzhou University, Changzhou 213164 , China;2.Huaide College, Changzhou University, Changzhou 213164 , China;3.National Experimental Demonstration Center for Materials Science and Engineering,Changzhou University, Changzhou 213164 , China;4.Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering,Changzhou University, Changzhou 213164 , China
Abstract:
In order to improve the characteristics of plasma nitriding layer, a novel plasma boron-nitriding is carried out on 42CrMo steel. The cross-sectional microstructure, phase compositions, cross-sectional hardness, brinell hardness tester and wear resistance of the nitriding layer are tested and analyzed by optical microscope, XRD, microhardness tester, nitriding layer toughness and friction and wear tester. The results show that plasma boron-nitriding can significantly increase the thickness of compound layer from 18.78 μm to 29.44 μm, and saw-tooth vertical wedge appears in the compound layer, which enhances the bonding force between the compound layer and the matrix. In addition, hard phases FeB and Fe2B are formed in the nitrided layer of the sample after plasma boron-nitriding, and the surface hardness of the sample is enhance from 750 HV0.05 to 1002 HV0.05. At the same time, the hardness in the same layer depth is significantly improved, and the thickness of the effective diffusion layer is increased from 265 μm to 355 μm, that is, the nitriding efficiency is increased by nearly 35%. The wear resistance and toughness of the samples treated by plasma boron-nitriding is obviously higher than that of conventional plasma nitriding.
Key words:  42CrMo steel  plasma boron-nitriding  boron  nitriding layer  wear resistance  toughness
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