材料科學(xué)基礎(chǔ)英文版課件_(4)(1)(已修改)
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【正文】 2022/2/15 Equilibrium and Stressinduced NonEquilibrium Grain Boundary Segregations of Phosphorus in a Steel Song Shenhua 起的非平衡晶界偏聚 2022/2/15 Preface (1) Grain boundary segregation (GS) Effects of grain boundary segregation on the properties of materials Mechanical, corrosion, electrical, and magic properties ., in structural materials, such as steel and Ni alloys Segregation of detrimental elements such as S, P, Sn, and Sb – decreasing the grain boundary cohesion – grain boundary weakening Segregation of beneficial elements such as B, C and Be – increasing the grain boundary cohesion – grain boundary strenthening Preface (2) 2022/2/15 Preface (3) GS EGS NEGS NEGS induced by high temperature deformation Stress induced NEGS Irradiation induced NEGS Thermally induced NEGS …… 2022/2/15 Preface (4) steel Applied stress 2022/2/15 Outline (1) ? Equilibrium grain boundary segregation – Segregation of phosphorus and molybdenum ? Introduction, experiment, results and discussion, summary – Relationship between phosphorus boundary concentration and ductiletobrittle transition temperature (DBTT) ? Introduction, experiment, results and discussion, summary – Effect of phosphorus grain boundary segregation on intergranular fracture ? Introduction, experiment, results and discussion, summary 2022/2/15 Outline (2) ? Stressinduced nonequilibrium grain boundary segregation – Introduction, experiment, results and discussion, summary ? Conclusions 2022/2/15 Outline (1) ? Equilibrium grain boundary segregation – Segregation of phosphorus and molybdenum ? Introduction, experiment, results and discussion, summary – Relationship between phosphorus boundary concentration and ductiletobrittle transition temperature (DBTT) ? Introduction, experiment, results and discussion, summary – Effect of phosphorus grain boundary segregation on intergranular fracture ? Introduction, experiment, results and discussion, summary 2022/2/15 Equilibrium grain boundary segregation (1) ? ? ? ?e x p , , 11 e q gii ie q e q g gI M I JCC G R T i I MC C C C? ? ?? ? ? ?? ?0 e q gM M IM I IG G C C?? ? ? ? ?? ?e x p11e q ge q gCC G R TCC????(McLean, 1957) (Seah, 1977) ? ?0 e q gI I IM M MG G C C?? ? ? ? ? (Guttmann, 1975) ? ? ? ?e x p , , 11e q gii ie q giiCC G R T i I MCC? ? ???Segregation thermodynamics 2022/2/15 Equilibrium grain boundary segregation (2) ? ? ? ?? ? 2 2 2 2220 441 e x p e r f c0eqC t C D t D tC C d d????? ???? ????? ?? ??2 e q gCC? ?Segregation kiics (McLean, 1957) erfc(x) = 1 – erf(x) 2022/2/15 Equilibrium grain boundary segregation (3) Ageing time So
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