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Deformation mechanism and quantitative characterization of Al2O3 inclusions in powder metallurgy superalloys

Progress in Natural Science:Materials International 2022年第4期32卷 482-489页

作者： Yefei Feng Fangzheng Ding Qiqiang Duan Jinwen Zou Xiaoming Zhou Yongwang Kang Xuqing Wang Science and Technology on Advanced High Temperature Structural Materials Laboratory AEEC Beijing Institute of Aeronautical Materials Institute of Metals Research Chinese Academy of Sciences

By means of implanting inclusions artificially, the evolution law of three-dimensional morphology and size of Al2O3inclusions in FGH96 powder metallurgy(PM) superalloy during hot iso-static pressing(HIP), hot extrusion(HEX) and hot isothermal forging(HIF) process was investigated by SEM and quasi in situ Micronano-CT. The size change of inclusions during different stages was studied quantitatively, the three-dimensional(3D) morphology of the inclusions was characterized, and the deformation mechanism was proposed. The results showed that the inclusions in powder stage were long stripe or plate-like shape. During HIP, Al2O3inclusions were mechanically bonded to the alloy matrix, and its chemical composition, morphology and size remained unchanged. During HEX,Al2O3inclusions were broken and elongated into chain shape due to shear stress. The quantitative relationship between inclusion size after extrusion and extrusion ratio as well as original inclusion size was established. During HIF, the relationship between 3D morphology, size, orientation and deformation of a single inclusion during forging compression was quantitatively characterized by quasi in-situ micronano-CT for the first time. The above evolution law provides theoretical basis and technical support for improving the purity level of powder turbine disk.

关键词： Powder metallurgy superalloy single inclusion Deformation mechanism Quantitative characterization Micronano-CT

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