By introducing the Zener-Hollomon parameter, which synthetically considersthe influence of deformation temperature and strain rate into damage mechanics, a damage evolutionmodel was developed to simulate the damage ev...By introducing the Zener-Hollomon parameter, which synthetically considersthe influence of deformation temperature and strain rate into damage mechanics, a damage evolutionmodel was developed to simulate the damage evolution of metallic materials during hot deformation.The errors between the prediction damage values and the experimental ones are within 6%.展开更多
Hot deformation of Fe=3%Si alloy within the temperature range of 1073-1473 K and strain rate range of 0.01-5 s-1 was carried out by compression test. Optical microscopy （OM）, electron backscattered diffraction （EBS...Hot deformation of Fe=3%Si alloy within the temperature range of 1073-1473 K and strain rate range of 0.01-5 s-1 was carried out by compression test. Optical microscopy （OM）, electron backscattered diffraction （EBSD） and transmission electron microscopy （TEM） were used to characterize the deformation microstructure on various scales. Dynamic recovery is the dominant softening mechanism under all experimental conditions. A dynamic recovery region and partial dynamic recrystallization region can be distinguished according to Zener-Hollomon parameter （Z） based on OM observation. Furthermore, the quantitative description of subgrain size and boundary misorientation has been set up as a function of Zener-Hollomon Darameter.展开更多
文摘By introducing the Zener-Hollomon parameter, which synthetically considersthe influence of deformation temperature and strain rate into damage mechanics, a damage evolutionmodel was developed to simulate the damage evolution of metallic materials during hot deformation.The errors between the prediction damage values and the experimental ones are within 6%.
基金supported by the National Natural Science Foundation of ChinaShanghai Baosteel Group Corporation (Nos.50871128 and 50734001)
文摘Hot deformation of Fe=3%Si alloy within the temperature range of 1073-1473 K and strain rate range of 0.01-5 s-1 was carried out by compression test. Optical microscopy （OM）, electron backscattered diffraction （EBSD） and transmission electron microscopy （TEM） were used to characterize the deformation microstructure on various scales. Dynamic recovery is the dominant softening mechanism under all experimental conditions. A dynamic recovery region and partial dynamic recrystallization region can be distinguished according to Zener-Hollomon parameter （Z） based on OM observation. Furthermore, the quantitative description of subgrain size and boundary misorientation has been set up as a function of Zener-Hollomon Darameter.
