材料科學(xué)基礎(chǔ)英文版課件_(4)(1)-資料下載頁
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【正文】 enization) (Termper) (Aging under different stresses for different time) 520℃ Heat treatment procedure Experiment (2) 520℃ 480℃ (Aging without stress for 1000h) 560℃ 2022/2/15 Experiment (3) 2022/2/15 Results and discussion (1) 0 .0 0 0 .0 5 0 .1 0 0 .1 5 0 .2 00100200300400500600T e st 2 Stress (MPa)S tr ai nT e st 1Yield strength: 462 MPa 2022/2/15 Results and discussion (2) 0 200 400 600 800 10001 4 . 01 6 . 01 8 . 02 0 . 02 2 . 0P boundary concentration (at.%)S t r ess ag ei ng t im e ( m in)0 500 1000 1500 2022 2500 3000 0 5 0 5 0 Strain (%)T i me (min)0 50 100 500 1000 1500 2022 2500 30001 2 . 01 6 . 02 0 . 02 4 . 0 S t r ess ag ei ng t i m e ( m i n)P boundary concentration (at.%)0 500 1000 1500 2022 2500 3000 0 1 2 3 4 5 Strain (%)T i me (min)0 500 1000 1500 2022 2500 3000 Strain (%)T i me (min)Creep curves and segregation kiics 0 50 100 500 1000 1500 2022 2500 30001 6 . 02 0 . 02 4 . 02 8 . 0 S t r ess ag ei ng t i m e ( m i n)P boundary concentration (at.%)40 MPa 40 MPa 200 MPa 200 MPa 350 MPa 350 MPa 0 100 200 1000 2022 300010. 012. 014. 016. 018. 0 St res s ageing t im e (m in)P boundary concentration (at.%)100 M Pa2022/2/15 Results and discussion (3) Stress ageing time P boundary concentration Complex effect Creep effect Combined effect σ σ Segregation kiics under high stress 2022/2/15 Results and discussion (4) ? Grain boundary is deformed preferentially ? Deformation can produce vacancy ( ) ? Strain hardening ? Deformation spreads to grain interior Segregation kiics under medium stress σ σ 2022/2/15 Summary ? Stress can induce different kinds of segregation kiics. ? Elastic deformation and creep deformation can both affect phosphorus segregation kiics. 2022/2/15 2022/2/15 Conclusions ? The interaction between phosphorus and molybdenum is very weak. ? There is a linear relationship between DBTT and phosphorus boundary concentration. ? A temperaturetime embrittlement diagram was established. From the diagram, the DBTT of the material aged for any time at any temperature can be predicted. ? Phosphorus grain boundary segregation facilitates intergranular fracture. The specimen experienced ductile fracture, intergranular fracture, and cleavage fracture when impactfractured from high to low temperature. ? Elastic deformation and creep deformation can both affect phosphorus segregation kiics during stress ageing. 2022/2/1
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