欢迎来到天天文库
浏览记录
ID:53737820
大小:1.15 MB
页数:6页
时间:2020-04-21
《P91钢蠕变-疲劳交互作用下断裂特性研究-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofMechanicalStrength枧械度2O12,34(6):886—89P91钢蠕变一疲劳交互作用下断裂特性研究INVESTIGATIoNoFFRACTUREPERFoRMANCEFoRP91STEELUNDERCREEP.FATIGUEINTERACTIoN张国栋·薛飞王兆希4赵彦芬张路蒙新明(1.苏州热工研究院,苏州215004)(2.南京工业大学机械与动力工程学院,南京210009)(3.清华大学材料科学与工程系,北京100084)(4.清华大学工程力学系,北京100084)ZHANGGuoDong·XUEFei,WANGZhaoXi·ZHAO
2、YanFenZHANGLuMENGXinMing(1.SuzhouNuclearPowerResearchInstitute,Suzhou215004.China)SchoolofMechanicalandPowerEngineering,NanjingUniversityofTechnology,Nang210009,China)(3.DepartmentofMaterialsScienceandEngineering,TsinghuaUniversity,Beijing100084,China)(4.DepartmentofEngineeringMechanics,T
3、singhuaUniversity,Beijing100084,China)摘要在546℃下,对电厂用关键材料P91钢进行应力控制的蠕变一疲劳交互作用下试验。分别讨论平均应力和应力幅对断裂时间的影响,分析断口形貌与韧窝脱粒成分,断口裂纹金相,获得P91钢蠕变一疲劳交互作用下断裂机制与断裂特性。研究结果表明,由于微观裂纹的闭合,P91钢蠕变一疲劳交互作用寿命随着下保载的时间增加而增加。当平均应力远小于应力幅时,试样主要表现为疲劳断裂,当平均应力与应力幅相等时,试样为蠕变疲劳共同作用下的断裂特征,当平均应力远大于应力幅时,断裂特征为蠕变断裂。通过断口金相分析,试样断口裂纹均为
4、穿晶断裂。对断口韧窝的脱粒成分研究,脱粒为氧化物。研究结果为P91钢蠕变一疲劳断裂机制分析提供理论和实验基础。关键词Pgl钢蠕变一疲劳断口微观形貌韧窝脱粒断裂特征中图分类号TG142.71TGI15.57AbstractAt546℃.stresscontrolledcreep—fatigueinteractiontestforP91wasinvestigated.Effectofmeanstressonfracturelife,fracturepatternandconstituentofdimpleparticle,fracturecrackmetallicphasew
5、erediscussedandanalyzedrespectively.MechanismandperformanceofthefracturewereobtainedforP91steelundercreep—fatigueinteraction.Theresearchresultsshowthat,becauseofclosureofthemicro-crackinP91steel,thecreep—fatiguelifeofP91steelisincreasingwithbottomholdingtimeadding.Whenthemeanstressislesst
6、hanthestressamplitudemuchmore,fatiguefractureisshownintheP91specimens.Asthemeanstressisequaltostressamplitude,creepandfatiguedominatethefractureofspecimens.Whenthemeanstressisgreaterthanstressamplitude,thefeatureofspecimensiscreepfracture.Bytheanalysisofconstituentofdimpleparticleinthefra
7、cture,theparticleisoxide.TheresearchresultscanprovidethetheoreticalandexperimentalbaseforfracturemechanismanalysisofP91steelundercreep—fatigueinteraction.KeywordsP91steel;Creep-fatigue;Micro-patternoffracture;Dimpleparticle;FracturefeatureCorrespondingauthor:ZHANGGu
此文档下载收益归作者所有