Molecular Dynamics Simulation of Strengthening Dependence on Precipitate Cr Composition in Fe-15at.%cr Alloy

Abstract

Molecular Dynamics simulation was employed to study precipitate composition dependence on strengthening. Edge dislocation interaction with pure, 80at.%, and 60at.% Cr precipitates of different sizes in a matrix of Fe-15at.%Cr was investigated. The precipitates were found to be relatively hard. This is evident from the absence of shearing mechanism after the dislocation has bypassed them, the formation of an Orowan-like dislocation shape, and comparatively higher stress values. Precipitates with higher Cr content were found to greatly impede dislocation glide as indicated by the time taken by the dislocation to bypass them. The composition dependence on critical unpinning stress was also observed. The interaction of edge dislocation with precipitates having higher Cr composition leads to higher critical unpinning stress. The extent of critical unpinning stress dependence on precipitate composition is, however, not as high as was reported previously. Besides, the study has also confirmed the fact that α' precipitation results in the hardening of high Cr ferritic/martensitic steels.

Department(s)

Civil, Architectural and Environmental Engineering

Second Department

Mechanical and Aerospace Engineering

Comments

National Natural Science Foundation of China, Grant 11505037

Keywords and Phrases

Composition; Cr; Dislocation; Molecular dynamics simulation; Precipitate

International Standard Serial Number (ISSN)

0968-4328

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

01 Apr 2020

PubMed ID

32006890

Link to Full Text

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