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1、2021/9/8EquilibriumandStress-inducedNon-EquilibriumGrainBoundarySegregationsofPhosphorusina2.25Cr1MoSteelSongShenhua2.25Cr1Mo钢中磷的平衡及应力引起的非平衡晶界偏聚2021/9/8Preface(1)Grainboundarysegregation(GS)EffectsofgrainboundarysegregationonthepropertiesofmaterialsMechanical,corrosion,electric
2、al,andmagneticpropertiese.g.,instructuralmaterials,suchassteelandNialloysSegregationofdetrimentalelementssuchasS,P,Sn,andSb–decreasingthegrainboundarycohesion–grainboundaryweakeningSegregationofbeneficialelementssuchasB,CandBe–increasingthegrainboundarycohesion–grainboundarystr
3、entheningPreface(2)2021/9/8Preface(3)GSEGSNEGSNEGSinducedbyhightemperaturedeformationStressinducedNEGSIrradiationinducedNEGSThermallyinducedNEGS……2021/9/8Preface(4)2.25Cr1MosteelAppliedstress2021/9/8Outline(1)EquilibriumgrainboundarysegregationSegregationofphosphorusandmolybden
4、umIntroduction,experiment,resultsanddiscussion,summaryRelationshipbetweenphosphorusboundaryconcentrationandductile-to-brittletransitiontemperature(DBTT)Introduction,experiment,resultsanddiscussion,summaryEffectofphosphorusgrainboundarysegregationonintergranularfractureIntroduct
5、ion,experiment,resultsanddiscussion,summary2021/9/8Outline(2)Stress-inducednon-equilibriumgrainboundarysegregationIntroduction,experiment,resultsanddiscussion,summaryConclusions2021/9/8Outline(1)EquilibriumgrainboundarysegregationSegregationofphosphorusandmolybdenumIntroduction
6、,experiment,resultsanddiscussion,summaryRelationshipbetweenphosphorusboundaryconcentrationandductile-to-brittletransitiontemperature(DBTT)Introduction,experiment,resultsanddiscussion,summaryEffectofphosphorusgrainboundarysegregationonintergranularfractureIntroduction,experiment
7、,resultsanddiscussion,summary2021/9/8Equilibriumgrainboundarysegregation(1)(McLean,1957)(Seah,1977)(Guttmann,1975)Segregationthermodynamics2021/9/8Equilibriumgrainboundarysegregation(2)Segregationkinetics(McLean,1957)erfc(x)=1–erf(x)2021/9/8Equilibriumgrainboundarysegregation(3
8、)AgeingtimeSoluteboundaryconcentrationThermalequilibri
