Effect of Surface Roughness on the Oxidation Behavior of a Directionally Solidified Ni-Based Superalloy at 1,100

• Published in: 金属学报：英文版 no. 3; pp. 381 - 385
• Main Author: Li Wang Wei-Guo Jiang Xiang-Wei Li Jia-Sheng Dong Wei Zheng Hui Feng Lang-Hong Lou
• Format: Journal Article
• Language: English
• Published: 2015
• Subjects: Ni基超合金; X射线衍射; 定向凝固; 扫描电子显微镜; 抗氧化性能; 氧化行为; 表面粗糙度; 镍基高温合金
• ISSN: 1006-7191; 2194-1289

The effect of surface roughness on the oxidation behavior of a directionally solidified Ni-based superalloy was investigated by surface mapping microscope,scanning electron microscope and X-ray diffraction.It was found that specimens with surface roughness of 0.05 urn exhibit the best oxidation resistance,while specimens with surface roughness of 0.14 μm behave worse than specimens with surface roughness of 0.83 μm.The specimens with surface roughness of 0.05 μm have the best oxidation resistance,which is mainly due to the smallest surface area exposed in air and thinnest work-hardening layer.The Al_2O_3 layer alleviates the oxidation process of the specimens with surface roughness of 0.83 μm,and this is the possible reason for the better oxidation resistance of samples with surface roughness of 0.83 μm than samples with surface roughness of 0.14 μm.