Microscopic stress characterisation of functional iron-based alloys by white X-ray microbeam diffraction

15th European Workshop on Modern Developments and Applications in Microbeam Analysis; 7th Meeting of the International union of Microbeam Analysis Societies

材料科学;物理学

Kwon, E.P.^1 ; Sato, S.^2 ; Fujieda, S.^3 ; Shinoda, K.^3 ; Kajiwara, K.^4 ; Sato, M.^4 ; Suzuki, S.^3

Korea Institute of Industrial Technology, Carbon and Light Materials Application RandD Group, Jeonju

54853, Korea, Republic of^1

Ibaraki University, Graduate School of Science and Engineering, Hitachi

316-8511, Japan^2

Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Sendai

980-8577, Japan^3

Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo

679-5198, Japan^4

关键词: Electron back scatter diffraction;    Iron-based alloy;    Measurements of;    Microstructural analysis;    Reversible martensitic transformation;    Stress evolution;    Tensile deformation;    Tensile loading;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/304/1/012008/pdf
DOI  :  10.1088/1757-899X/304/1/012008

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Microscopic residual stress evolution in an austenite (γ) grain during a shape-memory process in an Fe-Mn-Si-Cr alloy was investigated using the white X-ray microbeam diffraction technique. The stresses were measured on a coarse grain, which had an orientation near , parallel to the tensile loading direction with a high Schmid factor for a martensitic transformation. The magnitude of the residual stresses in a grain of the sample, which was subjected to a 23 % tensile strain and subsequent shape-recovery heating, was found to be very small and comparable to that prior to tensile deformation. Measurements of the recovery strain and microstructural analyses using electron backscatter diffraction suggested that the low residual stresses could be attributed to the significant shape recovery caused by a highly reversible martensitic transformation in the grain with a particular orientation.