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1、JournalofMechanicalStrength枧械度2O12,34(6):886—89P91鋼蠕變一疲勞交互作用下斷裂特性研究INVESTIGATIoNoFFRACTUREPERFoRMANCEFoRP91STEELUNDERCREEP.FATIGUEINTERACTIoN張國棟·薛飛王兆希4趙彥芬張路蒙新明(1.蘇州熱工研究院,蘇州215004)(2.南京工業(yè)大學(xué)機(jī)械與動(dòng)力工程學(xué)院,南京210009)(3.清華大學(xué)材料科學(xué)與工程系,北京100084)(4.清華大學(xué)工程力學(xué)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,對(duì)電廠用關(guān)鍵材料P91鋼進(jìn)行應(yīng)力控制的蠕變一疲勞交互作用下試驗(yàn)。分別討論平均應(yīng)力和應(yīng)力幅對(duì)斷裂時(shí)間的影響,分析斷口形貌與韌窩脫粒成分,斷口裂紋金相,獲得P91鋼蠕變一疲勞交互作用下斷裂機(jī)制與斷裂特性。研究結(jié)果表明,由于微觀裂紋的閉合,P91鋼蠕變一疲勞交互作用壽命隨著下保載的時(shí)間增加而增加。當(dāng)平均應(yīng)力遠(yuǎn)小于應(yīng)力幅時(shí),試樣主要表現(xiàn)為疲勞斷裂,當(dāng)平均應(yīng)力與應(yīng)力幅相等時(shí),試樣為蠕變疲勞共同作用下的斷裂特征,當(dāng)平均應(yīng)力遠(yuǎn)大于應(yīng)力幅時(shí),斷裂特征為蠕變斷裂。通過斷口金相分析,試樣斷口裂紋均為
4、穿晶斷裂。對(duì)斷口韌窩的脫粒成分研究,脫粒為氧化物。研究結(jié)果為P91鋼蠕變一疲勞斷裂機(jī)制分析提供理論和實(shí)驗(yàn)基礎(chǔ)。關(guān)鍵詞Pgl鋼蠕變一疲勞斷口微觀形貌韌窩脫粒斷裂特征中圖分類號(hào)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