Creep Behavior of 9% Ni Alloy Steel at Elevated Temperatures

doi:2011.25.4.12

J. Ocean Eng. Technol. > Volume 25(4); 2011 > Article

J. Ocean Eng. Technol. 2011;25(4):12-17.
DOI: https://doi.org/10.5574/KSOE.2011.25.4.012

Suh Chang-Min,Oh Sang-Yeob

School of Mechanical Engineering Kyungpook National University,School of Automotive Engineering Kyungpook National University

Keywords: Creep, Elevated temperature, Larson-Miller parameter, Life prediction, Activation energy

Abstract

Little design data is available for the creep life prediction of 9% Ni alloy in elevated temperatures. Therefore, in this study, a series of creep tests under 16 combined conditions with 4 kinds of stresses and 4 temperatures was performed to obtain creep design and life prediction data for 9% Ni alloy, with the following results. The stress exponents decreased as the test temperature increased. The creep activation energy gradually decreased as the stresses became larger. The Larson-Miller parameter (LMP) constant for this alloy was estimated to be about 2.