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http://dx.doi.org/10.7777/jkfs.2021.41.5.445

Thermodynamic Modeling of Ni-Cr-Nb-C System for Analysis of Fracture Behavior of Heat-resistant Casting Alloys (IN-657)  

Kim, DongEung (Korea Institute of Industrial Technology)
Publication Information
Journal of Korea Foundry Society / v.41, no.5, 2021 , pp. 445-453 More about this Journal
Abstract
Computational thermodynamics for various alloy systems is well known as the CALPHAD technique. Gibbs energy model parameters for each phase are obtained from experimentally measured thermodynamic properties and are mainly used to predict areas not experimentally measured and to analyze experimental results thermodynamically. In this study, the thermodynamic modeling of the Ni-Cr-Nb-C quaternary system is conducted for a thermodynamic analysis of the phenomena by which heat-resistant cast alloys (IN-657) are destroyed in certain areas after long-term use. The stable phases in the system according to the Cr content, phase fraction depending on the temperature, and long-range ordering parameters for the Ni2Cr phase are calculated and compared to results obtained experimentally. The calculated thermodynamic properties suitably explain the experimentally reported fracture temperature range and the results of stable phases formed in the fractured areas. Thermodynamic modeling through the CALPHD method is expected to be useful for analyzing and predicting the thermodynamic behaviors of various cast alloys.
Keywords
CALPHAD; Thermodynamic modeling; Heat-resistant casting alloys; Ni-Cr-Nb-C system and Fracture behavior;
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