宇航材料工艺http：//www.yhclgy.com2023年第1期TC2钛合金薄壁型材下陷成形工艺参数分析及优化张明杰齐立春黄利军李雪飞吴泽浩（中国航发北京航空材料研究院，北京100095）文摘采用试验和计算机模拟相结合的方法，对TC2钛合金薄壁型材的单边下陷成形工艺开展研究。通过在室温至600℃范围内对TC2合金型材的热拉伸变形行为进行分析，建立了该型材热拉伸的Johnson-Cook本构模型。在此基础上，对L截面TC2钛合金型材的单边下陷过程进行计算机模拟，分析了下陷过程中型材应力、应力三轴度的分布。结果表明，下陷区L拐角处容易产生应力集中，由于变形前段该区域的应力三轴度Rd>0，呈拉应力状态，因此微裂纹容易在应力集中处形核并沿型材纵向扩展。通过对成形温度、下陷段长度和过渡圆角半径进行优化，得到最佳工艺参数条件为成形温度300℃，下陷区长度21mm，过渡圆角半径49mm。关键词钛合金薄壁型材，下陷成形，本构模型，应力状态，有限元仿真中图分类号：TG316.1DOI：10.12044/j.issn.1007-2330.2023.01.006ParameterAnalysisandOptimizationofSubsidenceDeformationforThin-walledTC2AlloyProfilesZHANGMingjieQILichunHUANGLijunLIXuefeiWUZehao（AECCBeijingInstituteofAeronauticalMaterials，Beijing100095）AbstractInthispaper，thesubsidencedeformationprocessingofthethin-walledTC2alloyprofilewasstudiedbythermaltensiletestsandcomputersimulations.First，thehottensiledeformationbehavioroftheTC2alloyprofilewasanalyzedinthetemperaturerangefromroomtemperatureto600℃.Then，Johnson-Cookconstitutivemodelwasusedtodescribethehottensiledeformationbehavior.Throughcomputersimulations，thedistributionsofstressandstresstriaxialityduringsubsidencedeformationwereanalyzed.TheresultsshowthatstressconcentrationiseasytooccuratthecornerofLinthesubsidencearea，anditistensilestressduetothestresstriaxialRd＞0oftheareabeforedeformation.Withtheincreasingdeformation，thecrackextendsinlengthwisedirectionoftheprofile.Byoptimizingtheformingtemperature，thelengthofthesubsidenceareaandthetransitionradius，thebestsubsidencedeformationprocessingparametersfortheTC2alloyprofilearedeformationtemperatureis300℃，lengthofsubsidencedeformationzoneis21mm，interimfilletradiusis49mm.KeywordsTitaniuma...
