添加微量硼对离子渗氮渗层组织性能的影响  

Effect of Trace Boron Addition on the Microstructure and Properties of Plasma Nitriding Layer

作　　者：麻恒 罗琪 魏坤霞[1,2] 周正华 胡静[1,2,4] MA Heng;LUO Qi;WEI Kunxia;ZHOU Zhenghua;HU Jing(Jiangsu Key Laboratory of Materials Surface Science and Technology,Changzhou University,Changzhou 213164,China;Huaide College,Changzhou University,Changzhou 213164,China;National Experimental Demonstration Center for Materials Science and Engineering,Changzhou University,Changzhou 213164,China;Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[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

出　　处：《中国表面工程》2022年第2期170-175,186,共7页China Surface Engineering

基　　金：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。

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18.78μm增加到29.44μm;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Fe_(2)B,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 HV_(0.05)提高至100 2 HV_(0.05);有效硬化层厚度由常规离子渗氮的265μm增加到355μm,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。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 18.78μm to 29.44μm,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 Fe_(2)B are formed in the nitrided layer of the sample after plasma boron-nitriding,and the surface hardness of the sample is enhance from 750 HV_(0.05)to 1002 HV_(0.05).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 265μm to 355μm,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.

关 键 词：42CRMO钢 硼氮离子共渗 硼 渗层 耐磨性 韧性 

分 类 号：TG178[金属学及工艺—金属表面处理]