激光冲击次数对38CrMoAl钢渗氮耐磨损性能的影响.pdf

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1、第40卷第7期：2090-2094高电压技术Vo1．40．No．7：2090—20942014年7月31日HighVoltageEngineeringJuly31，2014DOI：10．13336~．1003-6520．hve．2014．07．024激光冲击次数对38CrMoAI钢渗氮耐磨损-I,土／4-~月匕B的影响李玉琴，何卫锋，王学德，李靖，罗思海，王波(空军工程大学等离子体动力学重点实验室，西安710038)摘要：为提高38CrMoA1钢渗氮层质量和耐磨性能，提出了激光冲击处理增强渗氮的组合方法。利用球磨实验分析了不同激光冲击次数下渗氮的耐磨性能，

2、采用SEM和XRD研究了激光不同冲击次数对38CrMoA1渗氮的微观组织和相成分的影响。结果表明随着冲击次数的增加，试样的比磨损率先降低后增加。从微观组织和相分析两个方面讨论了冲击次数对渗氮耐磨性能的影响机理激光冲击强化可促进渗氮的过程。在没有新相形成的条件下，随着激光冲击次数的增加，试样的表层形成的氮化物颗粒增大、数量增多，固溶强化和第二相强化作用增强，从而提高其耐磨性能。但当冲击次数继续增加，大量的氮化物沿晶界成网状分布时，就会降低38CrMoA1钢的耐磨性能。关键词：激光冲击；渗氮；38CrMoAI钢；冲击次数；微观组织；耐磨性能ImpactofLa

3、serShockTimesontheWearResistanceof38CrMoAISteelLIYuqin，HEWeifeng，WANGXuede，LIJing，LUOSihai，WANGBo(ScienceandTechnologyonPlasmaDynamicsLaboratory,AirForceEngineeringUniversity,Xi’an710038，China)Abstract：Inordertoimprovethenitridationlayer’Squalityandwearperformanceof38CrMOA1steel，w

4、eputforwardacombinedmethodoflasershockprocessingandnitfidation．Throughballmillingexperiments，wemeasuredthewearperformancesof38CrMOA1steelsamples，whichwerenitridatedafterprocessingbydiferenttimesoflasershocks．WealsoexaminedthemicrostructureandphasecompositionofthesamplesusingSEMand

5、XRD．Theresultshowsthat，withincreasingtimesoflasershocks，thewearratesofthesamplesdecreasefirstlyandincreaseafterwards．Moreover,wedis—cussedthemechanismofimprovingwearresistancebylasershocktreatmentfromtwoperspectives，namely,themicrostructureandphasecompositionofthenitridatedsurface

6、．ItisconcludedthatlasershockprocessingCallpromotenitridation．Whennonewphaseisformedinthenitridationlayer,withincreasingtimesoflasershocks，thesizesandnumberofthenitrideparticlesinthesurfaceincreases，hence，theseconddiphasestrengtheningandthesolutionstreng—theningefectsareenhanced，as

7、wellasthewearresistanceisimproved．However,whenthelasershocksaremorethanacertainvalue，lotsofnitrideparticlesalongthegrainboundarywilldistributewithreticulation，thusreducethewearresistance．Keywords：lasershockprocessing；nitridation；38CrMoA1steel；lasershocktimes；microstructure；wearres

8、istance属研究所在表面超声喷丸、机械研磨[4-5]基础上进行