谈贝氏体异种耐热钢焊接接头界面蠕变失效数值模拟

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1、学兔兔www.xuetutu.com第47卷第10期机械工程学报Vo1．47NO．102011年5月JOURNALOFMECHANICALENG1NEERINGMav2011DoI：1O．3901／JME．2011．1O．064马氏体／贝氏体异种耐热钢焊接接头界面蠕变失效数值模拟水张建强1,2李太江姚兵印刘福广章应霖2f1．哈尔滨工业大学现代焊接生产技术国家重点实验室哈尔滨150001；2．武汉大学动力与机械学院武汉430072；3．西安热工研究院有限公司西安710032)摘要：采用有限元法对高、中、低匹配马氏体T91与贝氏体G102异种

2、耐热钢接头在560℃、不同外加轴向拉应力条件下的蠕变最大主应力、vonMises等效应力进行数值模拟，并通过加速试验对模拟结果进行验证。结果表明，低匹配接头焊缝／G102界面附近最大主应力数值很高，蠕变孔洞易于在焊缝／G102界面形成。高匹配接头焊缝／1氐强母材界面的最大应力和vonMises等效应力数值很高，孔洞易于形核、扩张。中匹配接头焊缝／G102界面附近最大主应力和vonMises等效应力最小。加速试验后低匹配接头焊缝／G102界面发生蠕变断裂，高匹配接头焊缝／G102界面处的蠕变孔洞几乎连成裂纹，中匹配接头焊缝／G102界面附近

3、的晶界仅存在个别孤立蠕变孔洞，早期失效倾向最小。数值模拟结果与加速试验结果一致。关键词：马氏体耐热钢贝氏体耐热钢异种钢焊接接头界面蠕变损伤数值模拟中图分类号：TG407NumericalSimulationonInterfacialCreepFailureofDissimilarWeldedJointbetweenMartensiticandBainiticHeat．resistantSteelsZHANGJianqiang·LITaijiang。YAOBingyin。LIUFuguang。ZHANGYinglin(1．StateKeyL

4、abofAdvancedWeldingProductionTechnology,HarbinInstituteofTechnology,Harbin150001；2．SchoolofPowerandMechanicalEngineering，WuhanUniversity,Wuhan430072；3．Xi’anThermalPowerResearchInstituteCo．，Ltd．，Xi’an710032)Abstract：Them~imumprincipalstresses，yonMisesequivalentstressesindi

5、ssimilarweldedjointsbetweenmartensitic(T91)andbainiticheat—resistantsteel(G102)withdiferentweldingcreepstrengthsaresimulatedbyusingFEMundertheconditionsof560℃andappliedstressesof100MPa．120MPaand140MPa．Simulationresultsarevalidatedwithacceleratingtest．Theresultsshowthatthe

6、maximumprincipalstressisquitehighinthevicinityofweld／G102interfaceforundermatchingjoint，andcreepcavitiesareeasytoformintheweld／G102interface．Them~imumprincirIalstressandvonMisesequivalentstressinthevicinityofweld／G102interfaceforovermatchingjointarehigh，andcreepcavitiesar

7、eeasytoformandexpand．ThemaximumprincipalstressandvonMisesequivalentstressofweld／G102interfaceformedium-matchingjointaretheleastamongthethreejoints．TheinterfaciaIcreepdamageofundermatchingweldedjointisveryserious，thecreepcavitiesofweld／G102interfacenearlylinktoformcreepcra

8、cksinovermatchingjoint．Thecreepdamageandearlyfailuretendencyofmedium-matchingjointarethelowestam