论文摘要
An overlay coating material was deposited on a single crystal superalloy SRR99 by laser cladding.The microstructure and oxidation behavior of this coating was investigated through scanning electron microscopy（SEM） and X-ray diffraction（XRD）. The results indicated that although the composition of the coating was chosen based on the γ’ composition in René N5 superalloy, the primary solidification phase of this coating during laser cladding was γ-Ni. Furthermore, under the laser cladding condition, fine parallel dendrites grew epitaxially in the coating from the substrate, indicating the single crystal structure of the substrate was reproduced. When the single crystal MCrAlY coating was oxidized at 1000?, both Al2O3 and Al2O3 formed during initial oxidation process. As the oxidation time proceeded, the presence of Al2O3 facilitated the formation of NiAl2O4 spinel oxide. Once the spinel was observed, it flourished and induced some porosity in the scale. When the scale thickness increased to 6–7 μm, large area spallation of the scale began.
论文目录
文章来源
类型: 期刊论文
作者: Jingjing Liang,Yongsheng Liu,Jinguo Li,Yizhou Zhou,Xiaofeng Sun
来源: Journal of Materials Science & Technology 2019年02期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 金属学及金属工艺
单位: Institute of Metal Research, Chinese Academy of Sciences,State Key Laboratory of Solidification Processing, Northwestern Polytechnical University
基金: financially supported by the National Natural Science Foundation of China (NSFC) under grant Nos. 51771190,51401210,U1508213,51701210,51871221,the National High Technology Research and Development Program (863 Program,No. 2014AA041701),the fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP201834),the Theme Special Project of Shenyang Key Science and Technology Research and Development Programs (17-85-0-00)
分类号: TG174.4
页码: 344-350
总页数: 7
文件大小: 1114K
下载量: 46
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