BAUSCHINGER EFFECT AND DISLOCATION STRUCTURE IN STAINLESS STEEL DURING CYCLIC DEFORMATION

作     者：XIA Yuebo WANG Zhongguang DU Xiukui Institute of Metal Research,Academia Sinica,Shenyang,China XIA Yuebo,Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang,China XIA Yuebo WANG Zhongguang DU Xiukui Institute of Metal Research,Academia Sinica,Shenyang,China XIA Yuebo,Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang,China

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：1989年第2卷第1期

页      面：1-6页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：Bausckinger effect cyclic deformation dislocation structure 

摘      要：Cyclic deformation in symmetrical push-pull mode was carried out at room temperature in air using a Schenck hydropuls *** total strain amplitude which was kept constant dur- ing the test ranged from ±0.004 to±*** 0.2% offset yield stress σ_(0.2f) in tension and σ_(0.2r) in compression and peak stress σ were measured from the stress-strain hysteresis loop at various *** Bauschinger strenghth differential factor(BSDF)was then calcu- lated from σ_(0.2f) and σ_(0.2r).The energy loss △E of each cycle was determined from hysteresis loop *** parameters,BSDF,σ and △E,appear to have two distinctively different stages. The dislocation structures were observed using TEM in specimens deformed cyclically,for various *** observation shows that the dislocations pile-up mainly against grain boundaries and there exist large amount of deformation *** addition of 0.25 wt-% ni- trogen reduced the stacking fault energy of the alloy ***-slip and climb are therefore rather difficult to occur during the cyclic deformation at room temperature,and well-defined dislocation cells and walls can only be seen at the final stage of fatigue.