超塑变形中硬化规律在多尺度数值模拟中的应用韩晓宁1，杨俊宙2，吴建军2，李金山1(1.西北工业大学材料学院，陕西西安710072；2.西北工业大学机电学院，陕西西安710072)摘要：为了提高TC4超塑成形多尺度仿真数值模拟的有效性，本文针对高温下材料的硬化规律进行了研究。基于材料流变行为的特点，提出了应变硬化和应变软化的表征模型，并将其应用于超塑成形多尺度数值模拟过程中。研究结果表明，本文所采用的应变补偿模型，可用来描述TC4钛合金在超塑变形中的流变行为。此外，对比晶粒尺度、空洞体积分数等微观尺度变量与多尺度物理本构模型的结果可知，所提出的方案对热变形中微观组织演变的数值模拟是有效的。关键词：超塑变形；数值模拟；应变补偿；本构模型；钛合金中图分类号：TG146.2+3文献标识码：A文章编号：1000-8365(2023)01-0075-05ApplicationoftheHardeningLawintheMultiscaleSimulationforSuperplasticDeformationHANXiaoning1,YANGJunzhou2,WUJianjun2,LIJinshan1(1.SchoolofMaterialsScienceandEngineering,NorthwesternPolytechnicalUniversity,Xi'an710072,China;2.SchoolofMechanicalEngineering,NorthwesternPolytechnicalUniversity,Xi'an710072,China)Abstract：ToimprovetheprecisionofmultiscalenumericalsimulationsforthesuperplasticformationofTC4alloys,thehardeninglawofmetalmaterialsathightemperatureswasinvestigated.Basedontheflowbehaviorofhigh-temperaturetensiletests,asimplemodelconsideringstrainhardeningandsofteningwasproposed.Then,theestablishedmodelwasappliedtothemultiscalenumericalsimulationofsuperplasticforming.TheresultsshowthatthestraincompensationmodelcanbeemployedtodescribetheflowbehaviorofTC4titaniumalloyduringsuperplasticdeformation.Inaddition,comparingthesimulatedresultsofmicroscalevariablessuchasgrainsizeandcavityvolumefractionwiththecalculatedresultsofamultiscalephysicallybasedconstitutivemodel,itcanbeconcludedthattheproposedmethodcouldbeeffectiveforthenumericalsimulationofflowstressesandmicrostructureevolutionduringhotdeformation.Keywords：superplasticdeformation;numericalsimulation;straincompensation;constitutivemodel;titaniumalloy收稿日期:2022-12-02基金项目:国家重点研发计划(2021YFB3702603)；国家自然科学基金(52174377...
