72MATERIALSFORMECHANICALENGINEERINGVol.47No.6Jun.20232023年6月第47卷第6期2023机械工程材料D0I:10.11973/jxgccl202306013补焊次数对30CrMnSiA钢接头组织和力学性能的影响王浩军"，张兵宪"，马玲军”，雷龙宇’”，张志强”，杜明科”，张敏?（1.中航西安飞机工业集团股份有限公司，西安710089；2.西安理工大学材料科学与工程学院，西安710048)摘要：采用焊条电弧焊对30CrMnSiA钢焊接接头进行多次（3，4次）补焊试验，研究了补焊次数对接头组织和力学性能的影响。结果表明：补焊次数的增加对接头焊缝区域的显微组织类型影响不大，原始焊缝和补焊焊缝组织均为奥氏体柱状晶，但会导致原始焊缝区域的晶粒粗化和热影响区的大角度晶界分布密度下降，并减少热影响区的马氏体数量，从而对接头强度产生不利影响。补焊4次接头的抗拉强度较补焊3次接头降低了7.8%，断后伸长率降低了25.3%，但断裂机制仍为韧性断裂；补焊4次接头的抗弯性能和硬度也低于补焊3次接头。关键词：补焊；30CrMnSiA钢；显微组织；力学性能中图分类号：TG456.7文献标志码：A文章编号：1000-3738（2023)06-0072-06InfluenceofRepairWeldingTimeonMicrostructureandMechanicalPropertiesof30CrMnSiASteelJointWANGHaojun',ZHANGBingxian',MALingjun’,LEILongyu’,ZHANGZhiqiang',DUMingke?,ZHANGMin?(1.AVICXi'anAircraftIndustryGroupCompanyLTD,Xi'an710089,China;2.SchoolofMaterialsScienceandEngineering,Xi'anUniversityofTechnology,Xi'an710048,China)Abstract:Multiplerepairwelding(forthreeandfourtimes)testswerecarriedouton30CrMnSiAweldedjointbyshieldedmetalarcwelding.Theeffectoftherepairweldingtimeonthemicrostructureandmechanicalpropertiesofthejointwasstudied.Theresultsshowthatincreasingrepairweldingtimehadlittleeffectonthemicrostructuretypeofthejointweldzone.Themicrostructuresoftheoriginalweldandtherepairingweldbothconsistedofaustenitecolumnarcrystals.Increasingrepairweldingtimecouldleadtograincoarseningintheoriginalweldzone,andreducethedistributiondensityofhighanglegrainboundariesandmartensiticquantitiesintheheat-affectedzone,resultinginnegativeeffectsonthestrengthofthejoint.Thetensilestrengthofthefour-timerepairweldingjointwasreducedby7.8%andthepercentageelongationafterfracturewasreducedby25.3%compa...
