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Stress Relaxation in Superalloys Due to Microstructural Changes

Stress Relaxation in Superalloys Due to Microstructural Changes Relaxation of residual stresses in metallic materials is caused by diffusion of inhomogeneously distributed solved alloying elements and by microstructural mechanisms like rearrangements of dislocation structure and precipitation processes, respectively. Both processes are often linked with each other. Therefore, the description and the modelling of stress relaxation on a microstructural basis is very complicated. The aim of this study was to demonstrate some models for stress relaxation in metallic materials. The paper presents the relaxation of tensile loading stresses in Ni-based and Co-based superalloys at high temperatures. In stress relaxation tests the microstructure development was connected with a rearrangement of the dislocation structures and by a decreasing dislocation density. The stress relaxation in carbide strengthened superalloys is a typical case of dislocation relaxation in the presence of precipitations. By including the determined microstructure parameters, the effective stress model and also a constitutive model yields to qualitatively correct predictions of the tensile and relaxation behaviour. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Mechanics of Time-Dependent Materials Springer Journals

Stress Relaxation in Superalloys Due to Microstructural Changes

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References (8)

Publisher
Springer Journals
Copyright
Copyright © 1998 by Kluwer Academic Publishers
Subject
Physics; Polymer Sciences; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation Materials; Mechanics
ISSN
1385-2000
eISSN
1573-2738
DOI
10.1023/A:1009770805261
Publisher site
See Article on Publisher Site

Abstract

Relaxation of residual stresses in metallic materials is caused by diffusion of inhomogeneously distributed solved alloying elements and by microstructural mechanisms like rearrangements of dislocation structure and precipitation processes, respectively. Both processes are often linked with each other. Therefore, the description and the modelling of stress relaxation on a microstructural basis is very complicated. The aim of this study was to demonstrate some models for stress relaxation in metallic materials. The paper presents the relaxation of tensile loading stresses in Ni-based and Co-based superalloys at high temperatures. In stress relaxation tests the microstructure development was connected with a rearrangement of the dislocation structures and by a decreasing dislocation density. The stress relaxation in carbide strengthened superalloys is a typical case of dislocation relaxation in the presence of precipitations. By including the determined microstructure parameters, the effective stress model and also a constitutive model yields to qualitatively correct predictions of the tensile and relaxation behaviour.

Journal

Mechanics of Time-Dependent MaterialsSpringer Journals

Published: Mar 1, 1998

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