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Diffusion Controlled Transformation Plasticity of Steel under Externally Applied Stress SCIE SCOPUS

Title
Diffusion Controlled Transformation Plasticity of Steel under Externally Applied Stress
Authors
HeungNam HanJae Kon LeeSuh, DWSung-Joon Kim
Date Issued
2007-01-01
Publisher
Taylor and Francis
Abstract
The transformation plasticity of steel during phase transformation under external stress was modelled on a migrating interface diffusion mechanism. Atomic diffusion along the migrating phase interface is assumed to cause transformation plasticity by an accelerated Coble creep. A creep equation on transformation plasticity is derived as a function of transformation rate, temperature and externally applied stress. Predictions are compared with dilatometric measurements during the austenite-to-ferrite and ferrite-to-austenite transformation of steel under various levels of uniaxial compressive stress. Good agreement was found between the calculated and experimental transformation strain. The model proposed also successfully describes the thermally activated behaviour of the transformation strain. The evaluated effective diffusion coefficients on the migrating interface are three to four orders of magnitude larger than those reported for stationary boundaries.
Keywords
GRAIN-BOUNDARY MIGRATION; BAINITE TRANSFORMATION; PHASE-TRANSFORMATION; CONSTITUTIVE MODEL; SUPERPLASTICITY; DEFORMATION; RECRYSTALLIZATION; BEHAVIOR; KINETICS; STRAIN
URI
https://oasis.postech.ac.kr/handle/2014.oak/25682
DOI
10.1080/14786430600953731
ISSN
1478-6435
Article Type
Article
Citation
PHILOSOPHICAL MAGAZINE, vol. 87, no. 1, page. 159 - 176, 2007-01-01
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