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pISSN : 1598-706X / eISSN : 2288-8381


한국주조공학회지 (41권5호 445-453)

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

내열 주조 합금 (IN-657) 파괴 거동 해석을 위한 Ni-Cr-Nb-C 시스템 열역학 모델링

DongEung Kim†

한국생산기술연구원 뿌리기술연구소 스마트액상성형연구부문



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.


CALPHAD, Thermodynamic modeling, Heat-resistant casting alloys, Ni-Cr-Nb-C system and Fracture behavior