Pseudo-texture memory in AISI 321 austenitic stainless steel

18th International Conference on Textures of Materials

材料科学;物理学

Tiamiyu, A.A.^1 ; Szpunar, J.A.^1 ; Odeshi, A.G.^1

Department of Mechanical Engineering, University of Saskatchewan, Saskatoon

SK, Canada^1

关键词: Annealing condition;    Austenite grain size;    Crystallographic orientations;    Deformed austenite;    Temperature range;    Texture components;    Thickness reduction;    Ultra fine grain;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/375/1/012010/pdf
DOI  :  10.1088/1757-899X/375/1/012010

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this study, a 45 μm-sized AISI 321 austenitic stainless steel was cryo-rolled at -196 °C to 50 % thickness reduction to completely transform the γ-austenite phase to α'-martensite. The cryo-rolled sample was subsequently annealed in the temperature range of 923 - 1073 K for 30-28800s (0.5 - 480 mins) to reverse the α'-martensite back to γ-austenite and develop ultrafine grain (UFG) structure at an optimum annealing condition. Average austenite grain sizes of 0.22 and 0.31 μm were obtained at an optimum annealing conditions of 923 K for less than 480 minutes and 1023 K for 10 minutes, respectively. High resolution EBSD and XRD texture results shows that ζ-fibre ({110}) is the major texture component of austenite grains in the UFG structure and it is stronger in specimen annealed at 923 K than those of higher temperatures (973, 1023 and 1073 K) used in this study. The strong intensity of ζ-fibre in UFG is attributed to pseudo-texture memory in AISI 321 i.e. the ability of the steel to memorize the crystallographic orientation of the deformed austenite, rather than the conventional as-received austenite phase that is random.