45钢离子氮碳氧三元共渗与QPQ处理对比研究  

Comparison study of plasma oxynitrocarburising and QPQ for 45 steel

作　　者：卢阳阳 缪斌[1,2] 武计强 孙斐 汪丹丹[1,4] 胡静 LU Yangyang;MIAO Bin;WU Jiqiang;SUN Fei;WANG Dandan;HU Jing(Jiangsu Key Laboratory of Materials Surface Science and Technology,Changzhou University,Changzhou 213164,Jiangsu,China;Huaide College,Changzhou University,Jingjiang 214500,Jiangsu,China;Institute of Modern Equipment Manufacturing,Changzhou Institute of Industry Technology,Changzhou 213164,Jiangsu,China;National Experimental Demonstration Center for Materials Science and Engineering,Changzhou University,Changzhou 213164,Jiangsu,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,江苏常州213164 [2]常州大学怀德学院,江苏靖江214500 [3]常州工业职业技术学院现代装备制造学院,江苏常州213164 [4]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

出　　处：《材料工程》2022年第12期128-134,共7页Journal of Materials Engineering

基　　金：国家自然科学基金项目(21978025,51774052);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资助项目(TAPP-201806);江苏省研究生科研与实践创新计划项目(SJCX22_1327)。

摘　　要：盐浴复合(QPQ)技术为公认的能同时提高金属材料耐腐蚀性和耐磨性的表面改性技术,但其推广使用受到环保制约。为开发绿色高效表面改性技术,探索了离子氮碳氧三元共渗(PNCO)技术,并与QPQ技术改性效果进行了对比研究。选择45钢为原材料,分别采用PNCO技术和QPQ技术进行表面改性。利用光学显微镜及扫描电子显微镜、XRD、显微硬度计、摩擦磨损试验机、浸泡腐蚀实验对两种表面处理试样的截面显微组织、物相、表面及截面硬度、耐磨性和耐腐蚀性进行测试和分析。结果表明,在510℃×4 h工艺条件下,PNCO处理获得的化合物层厚度为20.14μm,有效硬化层厚度为59μm,截面最高硬度为760HV_(0.05),磨损率为1.39×10^(-3)g·N^(-1)·m^(-1),腐蚀失重率为0.39%。XRD结果分析表明,PNCO处理后渗层形成了Fe_(x)N化合物和以Fe_(3)O_(4)为主的氧化物相。PNCO和QPQ对比研究发现,两者表层硬度、耐磨性及耐腐蚀性均相近。本研究为绿色高效表面改性技术提供了可行的研究方向。QPQ(quench-polish-quench)is recognized as an effective surface modification technology which can improve the corrosion and wear resistance of metal materials.However,it is environmentally constrained in real application.In order to explore an environmental friendly and efficient surface modification technology,PNCO(plasma oxynitrocarburising)was developed and compared with QPQ technology for 45 steel.The cross-sectional microstructure,phase composition,microhardness profile,wear and corrosion resistance were tested and analyzed by optical microscopy,SEM,XRD,microhardness tester and wear tester etc.The results show that a compound layer thickness of 20.14μm and effective hardened layer thickness of 59μm,surface hardness of 760HV_(0.05),wear rate of 1.39×10^(-3)g·N^(-1)·m^(-1)and corrosion mass loss rate of 0.39%were obtained by PNCO.The XRD results demonstrate that PNCO treated samples mainly contain Fe_(x)N compound and Fe_(3)O_(4) oxide.A comparative study between PNCO and QPQ shows that the sectional microhardness,wear and corrosion resistance of the treating layers are the same level.The study provides a feasible research area for environmentally efficient surface modification technology.

关 键 词：45钢 PNCO QPQ 耐磨性 耐腐蚀性 

分 类 号：TG178[金属学及工艺—金属表面处理]