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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
