材料科學(xué)基礎(chǔ)英文版課件_(4)(1)-文庫吧
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【正文】 lute boundary concentration Thermal equilibrium concentration 2022/2/15 Outline ? 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 Introduction PMo interaction Weak or strong? 2022/2/15 Experiment (1) Ingot Plate Block 2 Normalization Austenization Temper Hot rolling Vacuum induction Raw material Cutting Block 1 Sample processing and pretreatment 2022/2/15 Experiment (2) AES Pretreated samples Experimental procedure Aging at different temperatures for different times and quenching Boundary concentration Fraction of Intergranular fracture SEM Impact test Machining DBTT Hardness test Metallographic analysis Hardness Grain zize 2022/2/15 920℃ 50min Time 980℃ 30min 650℃ 2h (Normalization) (Austenization) (Termper) (Aging under different stresses for different time) 520℃ Heat treatment procedure Experiment (3) 520℃ 480℃ 560℃ (Ageing) 2022/2/15 Experiment (4) Auger electron spectrometer Auger specimen 2022/2/15 Experiment (5) AES scanning position Fracture surface of AES specimen 2022/2/15 Results and discussion (1) Typical AES spectra 200 400 600 800 300 0 200 0 100 001000 100 001000 100 0 50005001000Cr Ki n e ti c e n e rg y (e V)480oC , 350 0hC OCrFePMo560oC , 500 h520oC , 800 h dN(E)/dE 2022/2/15 Results and discussion (2) 051015202530 MoMoMoMoPPPP1202200 800Boundary concentration (at.%)A g ei ng t i m e ( h)3500Ageing time Solute boundary concentration Thermal equilibrium concentration 480oC 2022/2/15 Results and discussion (3) 0510152025MoMoMoPPP800500 Boundary concentration (at.%)A g ei ng t i m e ( h)300048121620MoMoMoPPP500300 Boundary concentration (at.%)A g ei ng t i m e ( h)100520oC 560oC 2022/2/15 Results and discussion (4) 051015202530MoMoMoPPP560520 Boundary concentration (at.%)A g ei ng t emperat ure (oC)480010203040MoMoMoPPP560520 Segregation energy (kJ/mol
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