用电子衍衬技术研究了预变形6％的1018钢在疲劳过程中位错组态的演变。晶体中位错十分可动,变形态的松散胞迅速变化为主胞壁大致沿{100}的棋盘结构,再逐渐演变为位错偶墙及迷宫结构的低能位错组态。bcc和fcc的迷宫特征以及偶墙取向相似,说明位错线的滑移几何特性及相应的位错细节不是软化过程的控制因素,位错组态的能量状态对软化有重要影响。讨论了周期载荷下胞间位向差的消失以及内应力下降的过程。
The evolution of dislocation structures in 6% prestrained steel 1018during fatigue has been studied by TEM. The dislocations are quite movable, theloose cells quickly change to "checkboard" structures, in which the main cell wallslie about{100}. Then, the low energy dislocation structures-dipolar walls and laby-rinth structures are evolved. The characteristic of labyrinth and the orientation of di-polar walls are quite similar to f. c. c. crystal, it indicates the energy state of systemand the moving ability of dislocations are important factors affecting softening pro-cess, rather than the slip geometric characters of dislocations and details of disloca-tions. The decreasing in misorientation between adjoining cells and internal stressare discussed.
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