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高氮奥氏体不锈钢高温动态响应特性及本构关系(英文)_论文

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第38卷 第4期 2018 年 7 月 DOI:10.11883/bzycj-2016-0387 爆炸与冲击 EXPLOSION ANDSHOCK WAVES Vol.38,No.4 Jul.,2018 ArticleID:1001-1455(2018)04-0834-07 Dynamicmechanicalbehaviorsofhigh-nitrogenausteniticstainless steelunderhightemperatureanditsconstitutivemodel* WANG Yanli,JIA Guzhai,ZHANG Ting,WAN Mingming,JIWei,MU Xiaoming (No.52InstituteofChinaOrdnanceIndustries,Yantai264003,Shandong,China) Abstract:Mechanicaltestsofhigh-nitrogenausteniticstainlesssteel (HNS)wereperformedatstrain ratesof102 103s-1generatedbyasplitHopkinsonbarapparatusandunderdifferenttemperaturesfrom293 Kto873K.TheinfluencesofstrainrateandtemperatureontheplasticflowstressofHNSwereanalyzedby comparingthedynamictestswithquasi-statictests.Theresultsshowthatthedynamicmechanicalbehaviorof HNSissignificantlysensitivetostrainrateandtemperature;theflowstressincreasesrapidlywhenstrainrate exceeds400s-1;andatthesamestrainrate,theflowstressincreasesastemperaturedecreases.Thecoupling effectofstrainrateandtemperatureontheplasticdeformationbehaviorofHNSwasinvestigated.Theresults indicatethatthethermalsofteningeffectplaysakeyroleinthedynamicplasticdeformationprocessofHNS. BasedontheclassicalJohnson-Cookconstitutivemodel,amodifiedJohnson-Cookconstitutivemodelwasgiven whichcandescribethedynamicmechanicalbehaviorofHNSproperly. Keywords:dynamicmechanicalbehavior;Johnson-Cookconstitutivemodel;HNS;thermalsofteningeffect High-nitrogenausteniticstainlesssteels (HNS)arebecomingimportantengineering materials. Theirexcellentproperties,suchashighstrength,ductility,toughnessandworkhardening,non-magnetism,goodcorrosionresistanceandreducedtendencytograinboundarysensitizationareofgreatinterestforseawatersystems,chemicalandnuclearindustries,andmilitaryapplication[1].Asapotentialarmorprotective material,High-nitrogenstainlesssteelswillsufferfrom variousdynamicloads suchasexplosiveblastorprojectileimpact.Intheprocessofprojectileimpact,thematerialswillendurehighstrainratesandhightemperatures.Intheseconditions,themechanicalpropertiesofmaterialscouldbedifferentfromquasi-staticmechanicalproperties.Therefore,itissignificanttofindout aboutthemechanicalbehaviorsofHNSinbothlowandhighratesdeformationprocesses. InvestigationsofHNS’smechanicalbehaviorhavebeencarriedoutformanyyears,andsomeachievementshavebeenmade.Tomotaetal.[2]discoveredatrans-granularcleavagslikefracturefacetinCr-Mn-N austeniticstainlesssteels,whichisatotallydifferentfracturemechanism.Speideletal.[3]studiedthedynamicmechanicalbehaviorofhigh-nitrogensteelbyballistictests,and


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