Affiliation:
1. Korea Atomic Energy Research Institute
2. Pukyoung National University
3. Pukyung National University
Abstract
An isochronous stress-strain curve (ISSC) needs to be generated for a creep design
application for high-temperature materials. To generate the ISSC for type 316LN stainless steel
(SS), a series of creep data, which was obtained from creep tests with different stress levels at
600oC, was used. Creep curves were modeled by means of a nonlinear least square fitting
(NLSF) of the Garofalo model. In the fitting of the creep curve, a secondary creep region was
separated into first and second phases, and its fitting range was suitable to use for the first
phase. The Garofalo model revealed a good agreement with the experimental creep data, and
its parameters, P1, P2 and P3 revealed a good linear relationship as a function of a stress. The
ISSCs for type 316LN SS at 600oC were successfully generated up to 300,000 hours.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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