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1、2021/8/30EquilibriumandStress-inducedNon-EquilibriumGrainBoundarySegregationsofPhosphorusina2.25Cr1MoSteelSongShenhua2.25Cr1Mo钢中磷的平衡及应力引起的非平衡晶界偏聚2021/8/30Preface(1)Grainboundarysegregation(GS)EffectsofgrainboundarysegregationonthepropertiesofmaterialsMechanical,corrosi
2、on,electrical,andmagneticpropertiese.g.,instructuralmaterials,suchassteelandNialloysSegregationofdetrimentalelementssuchasS,P,Sn,andSb–decreasingthegrainboundarycohesion–grainboundaryweakeningSegregationofbeneficialelementssuchasB,CandBe–increasingthegrainboundarycohes
3、ion–grainboundarystrentheningPreface(2)2021/8/30Preface(3)GSEGSNEGSNEGSinducedbyhightemperaturedeformationStressinducedNEGSIrradiationinducedNEGSThermallyinducedNEGS……2021/8/30Preface(4)2.25Cr1MosteelAppliedstress2021/8/30Outline(1)EquilibriumgrainboundarysegregationSe
4、gregationofphosphorusandmolybdenumIntroduction,experiment,resultsanddiscussion,summaryRelationshipbetweenphosphorusboundaryconcentrationandductile-to-brittletransitiontemperature(DBTT)Introduction,experiment,resultsanddiscussion,summaryEffectofphosphorusgrainboundaryse
5、gregationonintergranularfractureIntroduction,experiment,resultsanddiscussion,summary2021/8/30Outline(2)Stress-inducednon-equilibriumgrainboundarysegregationIntroduction,experiment,resultsanddiscussion,summaryConclusions2021/8/30Outline(1)Equilibriumgrainboundarysegrega
6、tionSegregationofphosphorusandmolybdenumIntroduction,experiment,resultsanddiscussion,summaryRelationshipbetweenphosphorusboundaryconcentrationandductile-to-brittletransitiontemperature(DBTT)Introduction,experiment,resultsanddiscussion,summaryEffectofphosphorusgrainboun
7、darysegregationonintergranularfractureIntroduction,experiment,resultsanddiscussion,summary2021/8/30Equilibriumgrainboundarysegregation(1)(McLean,1957)(Seah,1977)(Guttmann,1975)Segregationthermodynamics2021/8/30Equilibriumgrainboundarysegregation(2)Segregationkinetics(M
8、cLean,1957)erfc(x)=1–erf(x)2021/8/30Equilibriumgrainboundarysegregation(3)AgeingtimeSoluteboundaryconcentrationTherma
