In the present reserch, a model has been proposed for estimate fracture toughness of Nickel-phosphorus (EN) layers. For this purpose, high phosphorus (9%) EN coatings with thicknesses of 6, 12, 24, 36 and 48 urn were ...In the present reserch, a model has been proposed for estimate fracture toughness of Nickel-phosphorus (EN) layers. For this purpose, high phosphorus (9%) EN coatings with thicknesses of 6, 12, 24, 36 and 48 urn were applied on steel substrates and then treated as conventional process. Fracture toughness of coatings was obtained using Vickers indentation method. It is found that fracture toughness increses as coating thickness reduces. Effect of coating thickness on fracture toughness was exhibited by various models. Evaluation of models revealed good agreement between of proposed model (Kc=f(t,t2)) and experimental data.展开更多
The aim of the present work was to study the effect of austenite grain size （AGS） on the martensite formation in a high-manganese twinning-induced plasticity （TWIP） steel. The results of a quantitative microstruct...The aim of the present work was to study the effect of austenite grain size （AGS） on the martensite formation in a high-manganese twinning-induced plasticity （TWIP） steel. The results of a quantitative microstructural characterization of the steel by the whole X-ray pattern fitting Rietveld software, materials analysis using diffraction （MAUD）, indicated that the volume fraction of αbcc-martensite increases with increasing AGS. However, the value of the stacking fault probability （Psf） does not show a large variation for samples with different values of AGS under water-quenching conditions.展开更多
文摘In the present reserch, a model has been proposed for estimate fracture toughness of Nickel-phosphorus (EN) layers. For this purpose, high phosphorus (9%) EN coatings with thicknesses of 6, 12, 24, 36 and 48 urn were applied on steel substrates and then treated as conventional process. Fracture toughness of coatings was obtained using Vickers indentation method. It is found that fracture toughness increses as coating thickness reduces. Effect of coating thickness on fracture toughness was exhibited by various models. Evaluation of models revealed good agreement between of proposed model (Kc=f(t,t2)) and experimental data.
文摘The aim of the present work was to study the effect of austenite grain size （AGS） on the martensite formation in a high-manganese twinning-induced plasticity （TWIP） steel. The results of a quantitative microstructural characterization of the steel by the whole X-ray pattern fitting Rietveld software, materials analysis using diffraction （MAUD）, indicated that the volume fraction of αbcc-martensite increases with increasing AGS. However, the value of the stacking fault probability （Psf） does not show a large variation for samples with different values of AGS under water-quenching conditions.
