Hot tensile deformation and fracture behaviours of Hastelloy C-276 alloy

ABSTRACT

The uniaxial tensile tests of Hastelloy C-276 were performed under elevated temperature and strain rate. Considering the effects of different deformation parameters, the flow behaviour, microstructure and fracture characteristics were analysed based on the experimental data. From the rheological curves, the typical characteristics of dynamic recrystallisation were observed at a relatively high deformation temperature and low strain rate. Optical microstructures show that the degree of dynamic recrystallisation increases with an increase in temperature. The SEM micrographs show that the amount of precipitates increases with an increase in deformation temperature. Examination of the fracture morphology at high magnifications revealed that the coalescence of microscopic voids is responsible for the fracture failure.

KEYWORDS:

• C-276 alloy
• hot tensile
• flow behaviour
• microstructure
• fracture morphology

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by National Program on Key Basic Research Project of China [grant numbers 2015CB057305 and 2014CB046702].