分析马氏体／贝氏体耐热钢焊接接头的界面蠕变损伤行为.pdf

《分析马氏体／贝氏体耐热钢焊接接头的界面蠕变损伤行为.pdf》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、维普资讯http://www.cqvip.com第43卷第12期金属学玫Vl01．43No．122007年12月第1275—1281页ACTAMETALLURGICASINICADec．2007PP．1275—1281马氏体／贝氏体耐热钢焊接接头的界面蠕变损伤行为张建强张国栋何洁章应霖张富巨(武汉大学动力与机械学院，武汉430072)摘要采用脉冲氩弧焊接工艺、高温加速模拟、高温持久实验研究了不同焊缝蠕变强度匹配条件下马氏体耐热钢9Cr1M0VNbN与贝氏体耐热钢12Cr2M0WVTiB异种钢焊接接头的高温强度、界面蠕变损伤及破坏特征．研究结果表明，焊

2、前523K预热、焊后1023K×1h回火条件下，接头的力学性能优异．加速模拟运行500，1000和1500h后低匹配焊接接头的界面蠕变损伤最严重，发生了界面蠕变断裂，早期失效倾向较大；中匹配接头的蠕变损伤最小，仅发现个别孤立蠕变孔洞，早期失效倾向最小，中匹配接头在923K下的持久强度(l08)与低匹配接头比较接近；高匹配接头在923K下的持久强度(10s)最低，蠕变孔洞几乎连成裂纹，蠕变损伤和早期失效较大．因此，对于上述异种钢焊接接头采用中匹配焊缝较为合理．关键词马氏体耐热钢，贝氏体耐热钢，异种钢焊接接头，蠕变损伤，早期失效中图法分类号TG407文献

3、标识码A文章编号0412-1961(2007)12-1275-07BEHAV10RS0FINTERFACICALCREEPDAMAGE0FDISSIMILARWELDEDJ0INTBETWEENMARTEN．SITICANDBAINITICHEAT—RESISTANTSTEELSZHANGJianqiang，ZHANGGuodong，HEe，ZHANGYinglin，ZHANGFujuSchoolofPowerandMechanicalEngineering，WuhanUniversity，Wuhan430072Correspondent：ZHANG

4、Jianqiang，associateprofessor，Tel：(027)68772254，E-mail：zhangjq123456~163．comManuscriptreceived2006—12—20，inrevisedform2007-07—10ABSTRACTThecreeprupturestrength．creepdamageandcharacteristicsofinterfacialfailureofdissimilarweldediointbetweenmartensiticheat—resistantsteelf9Cr1MoVNb

5、N1andbainiticheat—resistantsteel(12Cr2MowVTm)wereinvestigatedbymeansofargongasshieldedtungstenpulsedarcwelding，hightemperatureacceleratedsimulationandcreeprupturetest．TheresearchresultsindicatethattheinterfacialcreepdamageofundermatchingweldedointiSveryserious，theinterfacialfai

6、lureoccurredandtheearlyfailuretendenciesarehigherthanthoseofovermatchingandmedium——matchingweldedjoints．Thecreepdamageandearlyfailuretendencyofmedium-matchingjointarelowerthanthoseofovermatchingandundermatchingweldedjoints，andonlyisolatedholesarefoundinthetest．Thecreeprupturest

7、rength(l0)ofmediummatchingjointisalmostthesameasthatofundermatchingjoint．Thecreeprupturestrengthofovermatchingjointistheleastone，therefore，usingmedium—matchingjointiSreasonableforthedissimilarweldedjointbetweenmartensiticandbainiticsteels．KEYWoRDSmartensiticheat-resistantsteel，

8、bainiticheat-resistantsteel，dissimilarmetalweldingjoin