The softening behavior of Inconel 718 alloy at different temperatures was studied using two- stage interrupted compression method on Gleeblel500D thermal stimulator, and the 2% offset method was applied to analyze the...The softening behavior of Inconel 718 alloy at different temperatures was studied using two- stage interrupted compression method on Gleeblel500D thermal stimulator, and the 2% offset method was applied to analyze the experimental dates. Finally, the static reerystallizafion fraction was obtained, At the same times, optical microscope （OM） and transmission electron microscopy （TEM） were employed to investigate the microstructure characteristic. The experimental results showed that the recrystallization was more sensitive to temperature than holding time. The reerystaUization process finished quickly above 1 050℃, and significantly prolonged below 1 025℃. Additionally, the dynamical model of static recrystallization follows the Avrami equation. The nucleating mechanism was characterized by bulging at grain boundary and merging of sub-grain.展开更多
一、先易后难,分组突击打破原来字母表上排列次序,掌握先易后难,单个出现,分组突击的方法。先教单韵母a o u i üe er,口形由大到小,先圆后扁。并比作a有三指大,o有二指大,u有个小指大。这样学员便于发音。出现声母时,先教看见的,...一、先易后难,分组突击打破原来字母表上排列次序,掌握先易后难,单个出现,分组突击的方法。先教单韵母a o u i üe er,口形由大到小,先圆后扁。并比作a有三指大,o有二指大,u有个小指大。这样学员便于发音。出现声母时,先教看见的,再教里头的,即教完b p m f再教gk h。然后再教不常说的d t n l。展开更多
文摘The softening behavior of Inconel 718 alloy at different temperatures was studied using two- stage interrupted compression method on Gleeblel500D thermal stimulator, and the 2% offset method was applied to analyze the experimental dates. Finally, the static reerystallizafion fraction was obtained, At the same times, optical microscope （OM） and transmission electron microscopy （TEM） were employed to investigate the microstructure characteristic. The experimental results showed that the recrystallization was more sensitive to temperature than holding time. The reerystaUization process finished quickly above 1 050℃, and significantly prolonged below 1 025℃. Additionally, the dynamical model of static recrystallization follows the Avrami equation. The nucleating mechanism was characterized by bulging at grain boundary and merging of sub-grain.
文摘一、先易后难,分组突击打破原来字母表上排列次序,掌握先易后难,单个出现,分组突击的方法。先教单韵母a o u i üe er,口形由大到小,先圆后扁。并比作a有三指大,o有二指大,u有个小指大。这样学员便于发音。出现声母时,先教看见的,再教里头的,即教完b p m f再教gk h。然后再教不常说的d t n l。
