Hot Deformation Behavior of Ni80A Superalloy During Non-Isothermal Side Pressing
نویسندگان
1 Research and Development Center, Turbine Machine Middle East Co., Tehran, Iran
2 Department of materials science and engineering, K. N. Toosi University of Technology, Tehran, Iran
3 Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran
doi
10.22099/ijmf.2015.2912چکیده
In the present study, the microstructural changes of a Nickel based superalloy Nimonic80A during a non-isothermal deformation were studied. Therefore, microstructure evolutionduring hot side pressing test was predicted with combined methods of finite element analysis andprocessing map of the material. The predicted results were validated through experimentalmicrostructural studies. The results show that the distribution of deformation parameters (i.e.strain, strain rate, and temperature) is non-uniform in the deformed samples. The severity of thisnon-uniformity depends on the amount of sample reduction. High reduction value at one stepforging can cause flow localization and non-uniform dynamic recrystallization, which results theformation of adiabatic shear bands, while using the lower reduction value at each forging step,leads to more uniformly distribution of the deformation parameters and thus uniform the dynamicrecrystallization with the stable flow. Hence the workability and microstructure of the Nimonic80A alloy are mainly depends on the deformation path.
