Effect of Low Plastic Processing on High Temperature Oxidation Property of Directionally Solidified Nickel-based Superalloy DZ125
MA Wenbin1,2, GUO Jingjing2, LUO Hongyun2, TANG Jun2, YANG Xiaoguang1
1 School of Energy and Power Engineering, Beihang University, Beijing 100191, China 2 School of Materials Science and Engineering, Beihang University, Beijing 100191, China
Abstract: In this work, the low-plasticity burnishing (LPB) was employed to study the high temperature oxidation properties of the directionally solidified nickel-based superalloy DZ125. Microstructure analysis revealed that after the LPB process the microstructure of the surface layer changed from pristine columnar crystal to nanocrystalline, with an average grain size of about 10 nm. The surface oxide of LPB samples after high-tempe-rature oxidation at 950 ℃ was mainly alumina (Al2O3), which has better oxidation resistance than chromium oxide (Cr2O3). The oxide film obtained by LPB is relatively dense and uniform. Furthermore, analysis of the cross section of the specimen by EDS reveals that the LPB sample shows obvious internal-oxidation, with thicker oxide layer.
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