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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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Detection and Deformation Mechanism of Non-metallic Inclusions in FGH96 Alloy Isothermal Forging Disk

Detection and Deformation Mechanism of Non-metallic Inclusio...

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中国材料大会2012

作者： Xiaofeng Wang Xiaoming Zhou Jie Yang Jinwen Zou Wuxiang Wang Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

ISBN: (纸本)9783037856086;3037856084

According to the defects of powder metallurgy superalloy, especially the influence and damage of inclusions on properties of disk, the deviation between nondestructive testing and metallographic testing of inclusions in FGH96 alloy isothermal forging disk was investigated. Meanwhile, the types and deformation mechanism of inclusions were studied. The results showed that the buried depth tested by metallographic detection was less 67-180μm than nondestructive testing. The size of inclusions with metallographic detection was less about 18-50μm than nondestructive testing. The major types of inclusions in practical disk were Al2O3 and Al2O3-SiO2 , the inclusions run through several grains, no matter Al2O3 or Al2O3-SiO2 . The Al2O3 inclusion and matrix was purely mechanical bonding, but the Al2O3-SiO2 had reaction zone. There was remarkable effect of extrusion process on crushing and dispersing Al2O3 inclusion, but which was unremarkable for Al2O3-SiO2 .

关键词： powder metallurgy superalloy Inclusion Detection Deformation mechanism Extrusion process

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