欢迎来到天天文库
浏览记录
ID:49464695
大小:285.51 KB
页数:5页
时间:2020-03-01
《《controlledlasertransf省略elbypulsedndya》.doc》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、ControlledLaserTransformationHardeningofMartensiticStainlessSteelbyPulsedNd:YAGLaserB.Mahmoudi,A.R.SabourAghdam,andM.J.Torkamanyeffectiveprotectivelayerbecauseofbrittlenessandcracksensitivity.Therefore,anoptimalphaseisneededtohavemorehardnesscomparedwithinitialferriteand
2、moretoughnesscomparedwithfullymartensitephase.AISI420MSShasmediumchromiumcontent(13%)andrelativelylowcarboncontent(~0.2%).Thehardnessofthismetalisvaryingbetween205VHNto550VHN(dependingoncarboncontent)[4].TheaimsofthepresentstudyaretoemployapulsedNd:YAGlaserforLTHofAISI42
3、0tocontrolthecarbideparticlesolutionintothematrixandobtainatemperedmartensitephasewithoptimumhardnessandtoughnessandcomparetheresultswithannealedandconventionallyhardenedone.Theeffectoflaserprocessparametersonthehardnessanddepthofhardenedareaswereinvestigatedtoo.Abstract
4、⎯Lasertransformationhardening(LTH)wasappliedtothesurfaceoftheAISI420martensiticstainlesssteelbyapulsedNd:YAGlasertoobtainoptimumhardness.Theinfluencesofprocesspara-meters(laserpulseenergy,durationtime,andtravelspeed)onthedepthandhardnessoflasertreatedareawereinvestigated
5、.ImageanalysisofSEMmicros-tructureofAISI420showedthatplate-likecarbidehavealmostfullyand(30~40)%ofglobularcarbideparticlesdissolvedintothematrixafterlasertransformationhardeningbypulsedlaserandthemicrostructurewasrefinedtoobtaincontrolledtemperedmicrostructurewith450VHNh
6、ardness.martensiteIndexTerms⎯Lasertransformationhardening,martensiticstainlesssteel,martensitemicrostructure,pulsedNd:YAGlaser.doi:10.3969/j.issn.1674-862X.2010.01.0192.ExperimentalDetails2.1MaterialandLaserAsheetofAISI420MSSwith3mmthicknesswascutto2cm×2cmsamples.Thechem
7、icalcompositionofsamplesisshowninTable1.Preparingforlasersurfacetreatment,onesideofthesampleswaspolishedwith400-gritSiC.Inthepresetstudy,threekindsofspecimensfromthesameabovementionedmaterialwereexamined:as-received(AR),conventionallyheattreated(CHT)andlaserheattreated(L
8、HT)samples.ARsampleswerefullyannealedinthefurnacetohavetheferritewithchromiumcarbideparticles.Asacompar
此文档下载收益归作者所有