Plastic flow behavior of superalloy GH696 during hot deformation
(School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China)
Abstract: In order to investigate the hot deformation behavior of superalloy GH696, isothermal compression experiments were carried out at deformation temperatures of 880-1120 °C and strain rates of 0.01-10 s-1. And the deformation amount of all the samples was 50%. The strain rate sensitivity exponent (m) and strain hardening exponent (n) under different deformation conditions were calculated, meanwhile the effects of the processing parameters on the values of m and n were analyzed. The results show that the flow stress increases with the increase of strain rate and the decrease of deformation temperature. The value of m increases with the increase of deformation temperature and decreases with the increase of strain rate, while the value of n decreases with the increase of deformation temperature. A novel flow stress model during hot deformation of superalloy GH696 was also established. And the calculated flow stress of the alloy is in good agreement with the experimental one.
Key words: superalloy GH696; flow stress; deformation behavior; strain rate sensitivity exponent; strain hardening exponent; flow stress model