Creep Curve Modeling to Generate the Isochronous Stress-Strain Curve of Type 316LN Stainless Steel

Song Nan Yin; Woo Gon Kim; Ik Hee Jung; Yong Wan  Kim; Seon Jin Kim

doi:10.4028/www.scientific.net/KEM.385-387.705

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 385-387Creep Curve Modeling to Generate the Isochronous...

Creep Curve Modeling to Generate the Isochronous Stress-Strain Curve of Type 316LN Stainless Steel

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.

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Periodical:

Key Engineering Materials (Volumes 385-387)

Pages:

705-708

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.385-387.705

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Online since:

July 2008

Authors:

Song Nan Yin, Woo Gon Kim, Ik Hee Jung, Yong Wan Kim, Seon Jin Kim

Keywords:

Creep Curve, Garofalo Model, Isochronous Stress-Strain Curve, Nonlinear Least Square Fitting (NLSF), Type 316LN Stainless Steel

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