High strength state of UFG steel produced by severe plastic deformation

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Enikeev, N.A.^1,2 ; Sauvage, X.^3 ; Abramova, M.M.^1 ; Murashkin, M. Yu^1,2 ; Valiev, R.Z.^1,2

Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, K. Marx Str., 12, 450000 Ufa, Russia^1

Saint Petersburg State University, Universitetsky Prospekt, Peterhof 28, 198504, St. Petersburg, Russia^2

University of Rouen, Groupe de Physique des Matériaux, CNRS (UMR 6634), Avenue de l'Université, 76801 Saint-Etienne du Rouvray, France^3

关键词: Dislocation densities;    Grain size;    Hall-Petch relation;    High pressure torsions;    High strength;    Nanostructural;    Severe plastic deformations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012127/pdf
DOI  :  10.1088/1757-899X/63/1/012127

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

An UFG austenitic stainless steel of type 316 was produced by high pressure torsion at two different temperatures. As a result different nanostructures were observed in the investigated alloy characterized by different grain size and dislocation density. It was reported that the steel processed at both temperatures was characterized by significantly enhanced strength, which, in case of the steel processed at 430°C, exceeds the value expected for the given grain size according to Hall-Petch relation. This extra-strength is supposed to be due to the observed nanostructural features as segregations/clusters of solutes in grain boundary area formed by severe plastic deformation.