Hot compression tests were conducted in a temperature range of 800--1100 ℃and strain rate range of 0. 1- 10 s^-1 using a Gleeble 3500 thermomechanical simulator to investigate the influence of hot deformation paramet...Hot compression tests were conducted in a temperature range of 800--1100 ℃and strain rate range of 0. 1- 10 s^-1 using a Gleeble 3500 thermomechanical simulator to investigate the influence of hot deformation parameters （temperatures, strain rates and strains） on the grain boundary network evolution of a new grade Fe-Cr-Ni superaustenitic stainless steel. The results showed that a dominant effect of deformed temperature is ∑3^n （n = 0, 1, 2, 3） boundaries population increased with decreasing temperature, while they first increased and then reduced with in- creasing strain and strain rate. Interestingly, besides E3n （n = 1, 2, 3） twin grain boundaries, some El boundaries could interrupt grain boundaries network effectively, which enhance material performances. But they are scarcely re- ported. The misorientation of some segments LAGBs in the deformed microstructure （pancaked grains） increased and slid to high angle grain boundaries with increasing the fraction of reerystallized grains during hot deformation.展开更多
利用背散射电子衍射花样(EBSD),分析了冷轧变形量、退火温度和保温时间对高纯铝晶界特征分布的影响,并探讨了纯铝的变形再结晶行为与低∑重位点阵晶界(Coincidence Site Lattice,简称CSL)大量形成之间的内在联系。结果表明,变形量20%的...利用背散射电子衍射花样(EBSD),分析了冷轧变形量、退火温度和保温时间对高纯铝晶界特征分布的影响,并探讨了纯铝的变形再结晶行为与低∑重位点阵晶界(Coincidence Site Lattice,简称CSL)大量形成之间的内在联系。结果表明,变形量20%的试样在360℃退火时低∑-CSL晶界比例达到了44.2%,与低层错能金属相比,铝的∑3n晶界比例较低,其他低∑-CSL晶界比例较高。不同变形量试样的∑3n晶界比例在再结晶温度退火取得最大值,升高退火温度或延长保温时间,晶粒都将发生长大,一般大角度晶界的迁移会吞并已有的低∑-CSL晶界,造成∑3n晶界和低∑-CSL晶界比例都有所下降。展开更多
基金Item Sponsored by National Basic Research Program of China(2007CB209800)
文摘Hot compression tests were conducted in a temperature range of 800--1100 ℃and strain rate range of 0. 1- 10 s^-1 using a Gleeble 3500 thermomechanical simulator to investigate the influence of hot deformation parameters （temperatures, strain rates and strains） on the grain boundary network evolution of a new grade Fe-Cr-Ni superaustenitic stainless steel. The results showed that a dominant effect of deformed temperature is ∑3^n （n = 0, 1, 2, 3） boundaries population increased with decreasing temperature, while they first increased and then reduced with in- creasing strain and strain rate. Interestingly, besides E3n （n = 1, 2, 3） twin grain boundaries, some El boundaries could interrupt grain boundaries network effectively, which enhance material performances. But they are scarcely re- ported. The misorientation of some segments LAGBs in the deformed microstructure （pancaked grains） increased and slid to high angle grain boundaries with increasing the fraction of reerystallized grains during hot deformation.
文摘利用背散射电子衍射花样(EBSD),分析了冷轧变形量、退火温度和保温时间对高纯铝晶界特征分布的影响,并探讨了纯铝的变形再结晶行为与低∑重位点阵晶界(Coincidence Site Lattice,简称CSL)大量形成之间的内在联系。结果表明,变形量20%的试样在360℃退火时低∑-CSL晶界比例达到了44.2%,与低层错能金属相比,铝的∑3n晶界比例较低,其他低∑-CSL晶界比例较高。不同变形量试样的∑3n晶界比例在再结晶温度退火取得最大值,升高退火温度或延长保温时间,晶粒都将发生长大,一般大角度晶界的迁移会吞并已有的低∑-CSL晶界,造成∑3n晶界和低∑-CSL晶界比例都有所下降。
