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65Mn钢锯齿激光淬火的组织和硬度研究TheLaser-quenchingTextureandHardnessResearchof65-MnSteelSawtooth摘要:使用Nd:YAG脉冲激光器对65Mn钢锯齿进行表面强化,研究了不同激光淬火工艺参数对表面硬化层的影响。使用光学显微镜和维氏硬度计对不同激光淬火工艺条件下的试样进行显微组织分析和硬度测试。结果表明:各组试样均完全淬透,激光淬火后组织全部为马氏体,试样硬度均显剧提升。其中1号工艺参数淬火区硬度分布均匀,硬度为60HRC,满足生产要求。Abstract:Inthisstudy,theeffectofdifferentlaser-quenchingcraftparametersonthesurfacehardenedcaseof65-MnsteelsawtoothwasstrengthenedusingNd:YAGpulsedlaser.Samplesunderdiverselaser-quenchingconditionswereanalyzedthemicrostructureandtestedthehardness,exploitingopticalmicroscopeandVickers.Theresultsindicatedthatallgroupsofsamplesareabsolutelyquenched,alltissuesaremartensite,andtheirhardnessisdramaticallyimprovedaftertheywerequenchedinthepulsedlaser.Especiallythehardnessofthefirstcraftparametersquenchedareaequablydistribute,whichis60HRC,fittingproductiverequest.引言:65M钢是一种强度较高,具有一定韧性和塑性的合金钢,其广泛应用于生产金属冷切圆锯片。随着我国冶金工业的发展,用于切割各种型材的圆锯片需求量也剧增,因此提高国产65Mn钢锯片的质量变得尤为重要。结合锯片的服役条件,锯片失效由刃部表面的擦伤逐渐演变为疲劳裂纹扩展源,同时也发生着刻画磨损和粘着磨损,因此冶金锯片的硬度和抗磨损能力是关系到锯片使用寿命的关键性能指标。为了提高65Mn钢的性能,相关研究者在工艺上做了一些探索,冯旭东等研究了淬火工艺对65Mn钢组织及硬度的影响。传统提高65Mn钢锯片性能的方法多数采用热处理方式,虽然其性能得到提升,但传统的热处理存在工艺繁琐,生产周期长,淬火冷却效果不佳,以及变形、硬度分布不均匀等问题。因此有必要改进处理方式来提高65Mn钢锯片的性能。Introduction:65Mnsteeliswidelyappliedtoproducemetalcoldcuttingcircularsawblade,whichisakindofalloysteelwithhighstrength,plasticity,tenacity.Withtherapiddevelopmentofdomesticmetallurgyindustry,thequantitydemandofroundedsawbladeusedtocutvariouskindofmaterialisquicklyincreased.Thusitisessentialtoimprovethequalityofdomestic65Mnhacksaw.Accordingtotheserviceconditionofsawblade,thehardnessandantifrayingabilityofmetallurgysawedgeisvitalperformanceindexonitsusefullife.Becausehacksawfailureformsarecausedasedgesurfacescratchcomestobecomesourceoffatiguecrackpropagation,includealsosculpturewearandadhesivewear.Inordertoenhancethepropertiesof65Mnsteel,relativeresearchershavedonesomeexplorationoncraft.Foxexample,FengXudongresearchedtheeffectofquenchingcrafton65Mnsteeltextureandhardness.Themostlytraditionalwaystoboostthepropertiesof65Mnhacksawareheattreatmentways,whichcanimprovethestrength,butconventionalthermaltreatmentwayshavealotofdeficiencies,suchascomplicatedcraft,longproductionphase,inferiorquencherchillingefficiency,andasymmetricaldeformationandhardnessdistribution.Therefore,itisjustifiedwithoutanyexaggerationthatitisnecessarytooptimizethewaystoenhance65Mnhacksawproperties.激光相变硬化处理是一种具有良好前景的表面工程技术,与其它处理方式相比,激光表面处理工件具有较小的变形,易于实现自动化。而且激光处理是一种清洁能源,同时属于绿色制造,对环境的改善也具有重要的意义。在工业应用中激光表面硬化处理已经广泛用于提高工件的抗疲劳和摩擦磨损性能。激光相变原理包括:(1)通过高功率激光的作用增强钢表面温度达到奥氏体相变临界点以上;(2)基体的自冷却而实现快速冷却,不需要油水等冷却介质;(3)在保护气体下的自淬火等。陈卓君等对65Mn钢激光表面强化工艺参数进行了研究,得出当激光功率1200w,扫描速度20mm/s,光斑直径2.5mm,强化区的显微硬度达到最大值1670HV。黄永俊等对农机用65Mn钢预热处理后激光强化组织及性能进行了研究,他认为:激光强化组织有表层熔凝区(激光熔凝)、完全淬火、不完全淬火区、热影响区组成。许多研究者已经报道了关于不锈钢激光淬火,但是很少有人报道关于65Mn钢锯齿激光淬火。Lasertransformationhardeningdisposeisapromisingsurfaceengineeringtechnology.Comparedtootherways,work-piecetreatedinlasersurfacetechnologyholdsnegligibledeformationandiseasilyproducedinautomaticway.Thelaserdisposenamedgreenmanufacturingisakindofcleanenergy,whichissignificanttoimprovetheenvironment.Lasersurfacetransformationhardeningdisposehasbeenalreadywidelyappliedtoenhancetheantifatigueandfrictionalwearpropertiesofwork-piece.Laserphasetransitionprinciplesincludethreepoints:(1)steelsurfacetemperaturebeyondthetemperatureofaustenitecriticalphasetransitionpointbyemployinghighpowerlaser;(2)thefastcoolingcometrueviabasal-bodycooling,anddon’tneedcoolantssuchasoil,water.(3)theycanquenchbythemselvesinprotectiveair.ChenZhuojunresearchedtheparameterof65Mnsteelsurfacedisposedinlaserenhancedcraft,whomadeconclusionsthatwhenlaserpowerwas1200W,sweepspeedwas20mm/s,spotdiameterwas1.5mm,themicro-hardnessofenhancedareareachedthemaximumthatwas1670HV.Afterstudiedthetextureandpropertiesofpreheating65Mnsteelenhancedinlaser,HuangYongjunthoughtthatthetissuesweremadeofsurfacemeltedzone,completelaser-quenchingfield,incompletelaser-quenchingarea,heateffectedzone.Thereweremanyresearchershadreportedtheinformationthatlaser-quenchingstainlesssteel,butfewpeopleissuedtheinformationthat65Mnlaser-quenchinghacksaw.为了提高65Mn钢锯片的性能,获得良好的表面质量。采用激光淬火对试样进行处理,研究了不同激光淬火工艺参数对硬化层组织和硬度的影响,同时得出最佳工艺参数,用于指导生产实践。Inordertoimprovethepropertiesofthehacksawandachievegoodsurfaceequality,laser-quenchingwaywasusedintheexperiment.Theeffectofdifferentcraftparametersonhardenedcasetextureandhardnesswasresearched,andthebestcraftparametersweregained,whichcouldbeputintopractice.
本文标题:英语科技文翻译
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