Microstructure evolution of a multiphase superalloy processed by severe plastic deformation

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Sauvage, Xavier^1 ; Mukhtarov, Shamil^2

University of Rouen, CNRS UMR 6634, Faculte des Sciences, BP12, 76801 Saint-Etienne du Rouvray, France^1

Institute for Metals Superplasticity Problems, Russian Academy of Sciences, 39 Khalturin St, Ufa 450001, Russia^2

关键词: High pressure torsions;    Inter-metallic particle;    Micro-structure evolutions;    Post-deformation annealing;    Scanning transmission electron microscopy;    Severe plastic deformations;    Ultra-fine grained ( UFG);    Ultrafine grain structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012173/pdf
DOI  :  10.1088/1757-899X/63/1/012173

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper presents an overview and some original results about the microstructure evolution of an Ultra Fine Grained (UFG) nickel-iron based alloy INCONEL 718 processed by Severe Plastic Deformation (SPD). The ultrafine grain structure of this alloy that contains a high density of γ" and γ' precipitates was characterized by Scanning Transmission Electron Microscopy (STEM). We propose a comparison between two SPD processes, High Pressure Torsion (HPT) and Multiple Forging (MF). The grain refinement is much more pronounced by HPT but intermetallic particles are partly dissolved during SPD. The UFG structure after MF is obviously very different and exhibits a much better thermal stability especially because second phase particles do not reprecipitate during post-deformation annealing.