PAGE\*MERGEFORMATIV离子渗氮对机床齿轮用钢显微组织及性能的影响摘要由于近年来汽车、风电、核电行业的拉动,齿轮的需求量大幅度增加，因而近年来涉及齿轮加工机床制造的企业也日益增多。针对齿轮在运行过程中出现的磨损，断齿，精度下降等一系列问题，频繁更换齿轮会导致工作效率下降，成本提高，因而，改善齿轮本身的性能才是根本解决途径。本实验采用离子氮化工艺，然后利用金相显微镜、显微硬度计、X射线衍射仪对原始试样的表层和渗氮层的成分，显微组织，硬度及摩擦系数进行测定、分析、比较。实验结果表明，离子渗氮后渗氮层的组织为回火索氏体和氮化物，心部组织为回火索氏体。离子渗氮工艺使得机床齿轮用钢获得更高的表面硬度，强度；离子渗氮工艺使得机床齿轮的耐磨性提高。关键词：离子渗氮；显微组织；硬度；耐磨性；IONNITRIDINGONtheMICROSTRUCTUREANDPERFORMANCEoftheMACHINEGEARSTEELAbstractDuetothegrowthoftheautomobile,thewindpower,nuclearpowerindustryinrecentyearsleadstoasubstantialincreaseinthedemandofgear,whichincreasesthegearprocessingmachinemanufactureenterprise.Inordertosolvetheproblemsofwear,brokenteeth,precisiondecline,frequentreplacementofthegear,lowefficiencyandhighcosts,weshouldimprovetheperformanceofthegearitself,whichisthefundamentalsolution.Ionnitridinghasbeenusedinthisexperimentandweusethemetallographicmicroscope,micro-hardnesstester,Xraydiffractiontomeasure,analyseandcomparethesurfaceofmicrostructure,hardnessandfrictioncoefficientoftheoriginalsampleandthenitridinglayer.Theresultsshowthattheorganizationofthesurfaceofthesampleafterplasmanitridingistemperedsorbiteandnitrides，meanwhile,theinnerregionofmaterialistemperedsorbite.Theionnitridingprocessmakesthemachinegearsteeltoobtainahighersurfacehardness,strength,andincreasethewearresistance.Keywords:ionnitriding;microstructure;hardness;wearresistance;目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc327302252"摘要PAGEREF_Toc327302252\hIHYPERLINK\l"_Toc327302254"AbstractPAGEREF_Toc327302254\hIIHYPERLINK\l"_Toc327302256"第一章文献综述PAGEREF_Toc327302256\h1HYPERLINK\l"_Toc327302257"1.1引言PAGEREF_Toc327302257\h1HYPERLINK\l"_Toc327302258"1.2机床齿轮的研究现状PAGEREF_Toc327302258\h1HYPERLINK\l"_Toc327302259"1.2.1中国的研究现状PAGEREF_Toc327302259\h1HYPERLINK\l"_Toc327302260"1.2.2世界的研究现状PAGEREF_Toc327302260\h2HYPERLINK\l"_Toc327302261"1.3机床齿轮存在的问题PAGEREF_Toc327302261\h2HYPERLINK\l"_Toc327302262"1.3.1力学性能PAGEREF_Toc32