Grain boundary character modification employing thermo-mechanical processing in type 304L stainless steel

5th National Conference on Processing and Characterization of Materials

Pradhan, S.K.^1 ; Mandal, S.^1

Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur-721302, W.B, India^1

关键词: CSL boundary;    Electron back scatter diffraction;    Grain boundary engineering;    High angle grain boundaries;    Orientation imaging microscopy;    Thermo-mechanical processing;    Triple junction distributions;    Type 304l stainless steels;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/115/1/012032/pdf
DOI  :  10.1088/1757-899X/115/1/012032

来源: IOP

【 摘 要 】

Grain boundary engineering (GBE) approach has been employed to modify the boundaries character of a type 304L stainless steel through thermo-mechanical processing (TMP) route, which combined a low level of cold deformation (5, 10 and 15%) followed by annealing at 1173K and 1273K for 1hour. Employing Electron Back Scatter Diffraction based Orientation Imaging Microscopy, the fraction and distribution of low ∑ CSL boundaries (∑≤ 29) and its effect on random high-angle grain boundaries connectivity and triple junction distribution of as-received (AR) and GBE specimens were evaluated. It was possible to increase the fraction of low ∑ CSL boundaries up to 75% following GBE treatment (as compared to 50% in AR specimen). The GBE specimens also contained maximum number of percolation resistant triple junctions which could render better resistance against percolation related phenomena.