分析马氏体／奥氏体异种钢焊接接头iv型蠕变失效数值模拟.pdf

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1、学兔兔www.xuetutu.com第49卷第12期机械工程学报Vlo1．49NO．1220l3年6月JOURNALOFMECHANICALENGINEERINGJun．2O13DoI：10．3901／JME．2013．12．078马氏体／奥氏体异种钢焊接接头IV型蠕变失效数值模拟木张建强张国栋姚兵印2李太江2刘福广2(1．武汉大学水力机械过渡过程教育部重点实验室武汉430072；2．西安热工研究院有限公司西安710032)摘要：采用有限元法建立马氏体与奥氏体(T91／HR3C)异种钢焊接接头蠕变数值模型，模拟温度为600℃、内压为42．26MPa条件下T91／H

2、R3C接头的蠕变最大主应力、vonMises等效应力和应力三轴度。结果表明，最大主应力峰值位于接头内表面HR3C／焊缝和焊缝／T91界面以及离外表面2．96111111处焊缝／T91界面附近区域：vonMises等效应力峰值均位于焊缝／T91界面区域；内表面应力三轴度峰值位于焊缝／T91界面附近，而离内表面1．29Inrn处和离外表面2．96111112处的应力三轴度峰值位于T91钢侧细晶热影响区内，两部位的孔洞容易连接形成IV型蠕变裂纹。采用应力三轴度分析T91／HR3C接头T91侧细晶热影响区内蠕变孔洞扩张及裂纹扩展特性更为准确，与加速试验结果比较一致。关键词

3、：马氏体耐热钢奥氏体耐热钢最大主应力等效应力应力三轴度中图分类号：TG407NumericalSimulationontheTypeIVCreepFailureofDissimilarWeldedJointbetweenT91andHR3CHeat．resistantSteelsZHANGJianqiangZHANGGuodongYAOBingyin2LITaijiangLIUFuguang(1．KeyLaboratoryofMinistryofEducationforHydraulicTransients，WuhanUniversity,Wuhan430072；

4、2．Xi’anThermalPowerResearchInstituteCo．，Ltd．，Xi’an710032)Abstract：Creepfiniteelementmethod(FEM)modelofdissimilarweldedjointbetweenmartensiticheat-resistantsteel(T91)andaustenitic(HR3C)isestablished．Themaximumprincipalstress，vonMisesequivalentstressandstresstriaxialityissimulatedat600℃

5、andintheinnerpressureof42．26MPa．Theresultsshowthatthepeaksofthemaximumprincipalstressesareintheinterfaceofweld／T91andHR3C／weldininersurface，andinthevicinityofweld／T91interfaceinthedistanceof2．96mmawayfromoutersurface．Thecreepcavitiesareeasetoformintheweld／T91interfaceininersurfaceandi

6、ntheplaceof2．96mlnawayfromoutersurface．Inturn，intheweld／T91interfaceof1．29inlnawayfrominersurface，outersurfaceand2．96mrnawayfromoutersurface．ThehighervonMisesequivalentstressisintheweld／T91interfaceofinersurface，andcavitiesareeasetoexpand．Inturn，intheweld／T91interfaceof1．29mnlawayfrom

7、innersurface．outersurfaceand2．96／111／1awayfromoutersurface．Thestresstriaxialityintheweld／T91interfaceofinnersurfaceisquithigh，creepcavitiesareeasetolinkintointerracialcreepcracks．Andthat，thestresstriaxialityinthefinegrainheatafectedzone(HAZ)of1．2911111awayfrominersurfaceand2．961111I"1

8、wayfr