Determination of creep constitutive model for 28-48WCo alloy based on experimental creep tests at 817–982 °C
- 29 Downloads
The high-chromium high-nickel alloy is widely used as a heat-resistant material for components in plants under elevated temperatures, and thus, prediction of its creep deformation and rupture life is required for safe design. In this study, a creep constitutive model for the 28-48WCo alloy was determined by employing the Sherby-Dorn equation. Creep deformation tests were conducted at temperatures of 817, 871, 927 and 982 °C, under an applied stress ranging from 27.58 to 82.74 MPa. High temperature tension tests were also conducted to measure the change in elastic modulus with temperature variation. The model provided good predictability of the minimum creep strain rate in the range of experimental test conditions, with a coefficient of determination of 0.92. The creep rupture life was characterized using the Larson-Miller parameter. Creep design curves were proposed to estimate the creep rupture life of the 28-48WCo alloy at a temperature range of 817–982 °C.
KeywordsCreep Rupture life Constitutive model Larson-Miller parameter Fe-Cr-Ni 28-48WCo
Unable to display preview. Download preview PDF.
- E. Guglielmino, R. Pino, C. Servetto and A. Sili, Creep damage of high alloyed reformer tubes, Handbook of materials failure analysis with case studies from the chemicals, concrete and power industries (2016) 69–91.Google Scholar
- C. R. Barrett, A. J. Ardell and O. D. Sherby, Influence of modulus on temperature dependence of activation energy for creep at high temperatures, Transactions of the Metallurgical Society of AIME, 230 (1) (1964) 200.Google Scholar
- J. Christopher and B. K. Choudhary, Applicability of improved Dyson-McLean approach to creep deformation behavior of tempered martensitic P9 steel, Material at High Temperature (2017) 1–11.Google Scholar
- Alloy data sheet for KHR48NCo, Kubota metal corporation (1999).Google Scholar
- ASTM E8/E8M, Standard test methods for tension testing of metallic materials (2016).Google Scholar
- ASTM E139, Standard test methods for conducting creep, creep-rupture, and stress-rupture test of metallic materials (2011).Google Scholar