H13热作模具钢疲劳蠕变交互损伤模型.pdf

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1、中国科技论文在线http://www.paper.edu.cnStudyonthefatigue-creepinteractiondamagemodelfor#H13*LuoYuanxin,DuWeiqi5(ChongqqingUniversity,CollegeofMechanicalEngerneering,Chongqing,400000)Abstract:AISIH13(4Cr5MoSiV1)asmainmaterialofextrusiontoolsuffersfromfatigueandcreepdamageduetoitsextremeworkingcondition.S

2、tress-controlledfatigueandcreep–fatigueinteractionexperimentshavebeencarriedoutat500°Ctoinvestigateitsdamageevolution.Anewfatigue-creepinteractiondamagemodelhasbeenproposedonthebasisofcontinuedamagemechanics(CDM).A10newequivalentimpulsedensityforfatigue-creeptestswasproposedtobytransformingcreep

3、impulsedensityintofatigueimpulsedensity.Theexperimentalresultsindicatedthatthedamagemodelcanbemoreapplicabletodescribethedamageevolutionforcreep–fatigueinteraction.Keywords:metalmaterial;fatigue-creep;continuedamagemechanics(CDM)150IntroductionExtrusioniswellknownasahigh-volumeproductionprocesst

4、oproducealuminumpartswithfixedsectionalprofilesforapplicationsintheindustriesofconstruction,automobile,aerospace,etc.It’sreportedthattherepairandreplacementofextrusiontoolshassignificantimpactontheproductioncostsduetothefailurecausedbythethermo-mechanicalloadingof20extrusion.Inatypicalindustrial

5、setting,uptohundredsofbilletswillbeextrudedsequentiallyatafrequencyof10billetseveryhour,whichleadstorepetitiveloadingandunloadingexertedon[1]extrusiontools.Intheextrusionprocess,thebilletforcedtoflowthroughthetoolsleadstoaformingload,whichcanbeconsideredstableoverasinglestroke(dwelltime).Moreove

6、r,athermalbalanceofthedie-presssystemwillbegenerallyobtainedafteraninitialwarm-upphase25oftheprocess(around3-5ramstrokes),keepingthedietemperatureremainingfairlystableduring[2]extrusion(450°Cto500°C).Theextrusiondieisunderthefatigue-creepinteractionduetothecombinedeffectofstableformingloadathigh

7、temperatureinmultiplebilletsproduction,whichplaysakeyroleinthefailuremechanisms.Thefamilyof5%chromiumhot-worktoolsteelse.g.,AISIH11(X38CrMoV5-1),AISIH1330(4Cr5MoSiV1),arecommonlyusedthematerialofaluminumextrusiontools.Toprol