The experimental study of Bauschinger effect in Mn18Cr18N austenitic stainless steel was presented by compression-tensile cyclic loading tests with the prestrains ranging from 0.005 to 0.1,which was illustrated utiliz...The experimental study of Bauschinger effect in Mn18Cr18N austenitic stainless steel was presented by compression-tensile cyclic loading tests with the prestrains ranging from 0.005 to 0.1,which was illustrated utilizing stress-strain curves and analysed by TEM images from aspects of microstructural mechanisms.Moreover,the Bauschinger effect and its associated roundness phenomenon in reverse flow curve with respect to different cycles and cyclic strain amplitudes were evaluated in a quantitative manner.The experimental results indicate that Bauschinger effect is apparent during the test.At smaller cyclic strain amplitude,intergranular backstress is the main source of Bauschinger effect.With further increasing of cycles,dislocation density increases and dislocation movement is hindered in the reverse deformation.Therefore,Bauschinger effect is weakened to some extent.At large cyclic strain amplitude,backstress originating from the dislocation pile-up at grain boundaries and the continuous formation of deformation twins dominate the Bauschinger effect.In addition,the backstress results in the roundness of reverse curve during cyclic loading.The larger value ofΔεp*,the more obvious the roundness of the reverse curve,and the more significant the Bauschinger effect.展开更多
本文应用有限单元法分析了预变形、粒子尺寸、体积分数和组分相的屈服强度比对双相钢的 Bauschinger Effect(BE)及残余相应力的影响.对 BE 和残余相应力之间的关系、非弹性卸载、卸载塑性及反向变形对 BE 和残余相应力的影响也作了讨论...本文应用有限单元法分析了预变形、粒子尺寸、体积分数和组分相的屈服强度比对双相钢的 Bauschinger Effect(BE)及残余相应力的影响.对 BE 和残余相应力之间的关系、非弹性卸载、卸载塑性及反向变形对 BE 和残余相应力的影响也作了讨论.一些计算分析和相应的实验结果相比较,符合较好.展开更多
基金the National Natural Science Foundation of China(No.51575372)the Science and Technology Research Plan(Industrial)Project of Shanxi Province,China(No.201603D121006-2)+1 种基金the Start-up Fund for Scientific Research of Taiyuan University of Science and Technology(No.20172011)the Fund for Shanxi Key Subjects Construction。
文摘The experimental study of Bauschinger effect in Mn18Cr18N austenitic stainless steel was presented by compression-tensile cyclic loading tests with the prestrains ranging from 0.005 to 0.1,which was illustrated utilizing stress-strain curves and analysed by TEM images from aspects of microstructural mechanisms.Moreover,the Bauschinger effect and its associated roundness phenomenon in reverse flow curve with respect to different cycles and cyclic strain amplitudes were evaluated in a quantitative manner.The experimental results indicate that Bauschinger effect is apparent during the test.At smaller cyclic strain amplitude,intergranular backstress is the main source of Bauschinger effect.With further increasing of cycles,dislocation density increases and dislocation movement is hindered in the reverse deformation.Therefore,Bauschinger effect is weakened to some extent.At large cyclic strain amplitude,backstress originating from the dislocation pile-up at grain boundaries and the continuous formation of deformation twins dominate the Bauschinger effect.In addition,the backstress results in the roundness of reverse curve during cyclic loading.The larger value ofΔεp*,the more obvious the roundness of the reverse curve,and the more significant the Bauschinger effect.
