Fracture characteristics and criteria of Hastelloy C-276 alloy during high-temperature deformation

Abstract

Hot tensile tests were performed on Hastelloy C-276 alloy in the temperature range of 850–1150° C and strain rate range of 0.01–10 s⁻¹ to reveal its fracture characteristics and critical fracture failure conditions during high-temperature deformation process. Short-term aging treatments were also conducted to analyze the effects of precipitation on the fracture behaviors in conjunction with the experimental results obtained from the hot tensile tests. It was observed that the main precipitates in Hastelloy C-276 alloy under hot tensile deformation and short-term aging treatment were identified as M₆C carbides, around which the microscopic voids nucleate when the external forces were applied. Considering the effects of deformation temperature and strain rate, two failure criteria based on Zener-Hollomon parameter were developed to describe the fracture behaviors of Hastelloy C-276 alloy deforming at elevated temperatures. Finite element method (FEM) coupling with the proposed failure criteria was used to examine the validity by comparing the predicted values with the experimental data, and the comparison results indicate that the established failure criteria were capable of predicting the fracture behaviors of Hastelloy C-276 alloy in hot deformation process.

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