Effect of Aging Treatment on Microstructure and Properties of Novel Co-Ni Based Superalloy
Author of the article:HE Peijian;ZHONG Xiaokang;HAN Fusheng
Author's Workplace：China Merchants Chongqing Communications Technology Research and Design Institute Co.,Ltd.,Chongqing 400067,China;Key Laboratory of Materials Physics,Institute of Solid State Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China
Key Words：Co-Ni based superalloy aging heat treatment γ' phase Vickers hardness dislocation shear mechanism
Abstract：A new type of Co-Ni based superalloy was aged by different heat treatment processes.The effects of aging treatment on the microstructure and properties of the alloy were analyzed by scanning electron microscope(SEM)and Vickers hardness tester.The results show that spherical γ' phase precipitates in the microstructure of the new Co-Ni based superalloy after aging treatment,and the volume fraction of γ' phase reaches more than 50%.The grain size of the precipitated γ' phase increases with the increasing of aging temperature and time,while the volume fraction of γ' phase is mainly determined by aging temperature,and has nothing to do with aging time,and decreases with the increasing of aging temperature.According to the weak and strong dual coupling models,the optimal particle size of γ' phase is calculated to be between 35 and 40 nm.
