Grain size modeling of a Ni-base superalloy using cellular automata algorithm

作者：Reyes L A^*; Paramo P; Salas Zamarripa A; de la Garza M; Guerrero Matta M P

来源：Materials and Design, 2015, 83: 301-307.

DOI：10.1016/j.matdes.2015.06.068

• Cellular automata method
• Recrystallization
• Inconel 718

Nickel-base superalloys are used in highly demanding applications such as energy and aerospace industries. These alloys present good corrosion resistance, weldability and mechanical stability at high temperatures. Numerical methods are commonly used to predict the mechanical and microstructural behavior of heat resistant alloys. The aim of the present work was to model recrystallized grain size evolution under isothermal conditions using the cellular automata (CA) technique. The CA model was applied to simulate hot compression of Inconel 718 nickel-base alloy at 980 degrees C and 1020 degrees C. A finite element analysis was conducted to acquire input parameters to the model such as strain and strain rate. Hardening and recovery coefficients were calculated in order to represent the competitive effects during deformation. The influence of local changes of initial grain with fully and partial recrystallized microstructures were simulated by CA and compared with isothermal hot compression results. The model was able to comprehensively predict necklace type microstructures. The average grain size was generally in good agreement with the experimental data.

• 出版日期2015-10-15