Cellular automata simulation of grain growth of powder metallurgy Ni-based superalloy  

作　　者：Yi-ling Jiang Sha-sha Liu Rong-gui Lu Xu Cheng Jia Li Yang Chen Gao-feng Tian 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [2]National Engineering Laboratory of Additive Manufacturing for Large Metallic Components,Beijing 100191,China [3]Beijing Institute of Aeronautical Materials,Beijing 100095,China

出　　处：《Journal of Iron and Steel Research International》2023年第4期838-848,共11页

基　　金：National Major Science and Technology Project(2017-VI-0009-0079);Basic and Applied Basic Research Foundation of Guangdong Province(2020B0301030001).

摘　　要：Primary γ'phase instead of carbides and borides plays an important role in suppressing grain growth during solution at 1433 K of Ni-based FGH98 superalloys.Results illustrate that as-fabricated FGH98 superalloy has equiaxed grain structure,and after heat treatment,grains remain equiaxed but grow larger.In order to clarify the effects of the size and volume fraction of the primaryγ'phase on the grain growth during heat treatment,a 2D cellular automata(CA)model was established based on the thermal activation and the lowest energy principle.The CA results are compared with the experimental results and show a good fit with an error less than 10%.Grain growth kinetics are depicted,and simulations in real time for various sizes and volume fractions of primaryγ'particles work out well with the Zener relation.The coefficient n value which reflects the pinning ability in Zener relation is theoretically calculated,and its minimum value is 0.23 when the radius of primaryγ'phase is 2.8μm.

关 键 词：Grain growth Cellular automata Ni-based FGH98 SUPERALLOY PRIMARY γ'phase Microstructure 

分 类 号：TG146[一般工业技术—材料科学与工程]