Materials Reports  2021, Vol. 35 Issue (Z1): 395-401 |
| METALS AND METAL MATRIX COMPOSITES |
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| Corrosion Behavior of Friction Welding Joints of Ni-Fe Based Superalloy in Coal Ash/Flue Gas |
| LI Boshuai1,2, LU Jintao2, ZHU Ming1, HUANG Jinyang2, DANG Yingying2, GU Yuefeng2
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1 College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
2 National Energy Clean and Efficient Thermal Power Technology Research Center, Xi'an Thermal Power Research Institute Co. Ltd, Xi'an 710032, China |
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Abstract The oxidation behavior of welded joints with different microstructure in 750 ℃ coal ash/flue gas was studied in terms of corrosion kinetics, composition of oxide film phase and microstructure of HT700 Ni-Fe based superalloy. The results show that the main corrosion products on the surface of welded joints are basically the same, mainly Fe, Cr rich oxides, and a small amount of Al2O3, TiO2 and Ti, Mo corrosion products of internal vulcanization. After welding, the diffusion rate of elements Cr welded joints is low, and the time of forming continuous oxide layer is later than that of welded structure, which leads to larger oxide film thickness. The oxidation behavior of weld seam in different regions of weld state and heat treatment state after welding shows the characteristics of smaller grain size and thinner oxide film, and the weld fusion line has the thinnest oxide film thickness.
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Published: 16 July 2021
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| Fund:Natural Science Basic Research Program of Shaanxi (2020JM-716), Youth Special Support Program of Shaanxi Province (ZD18SST05), Science and Technology Project of China Huaneng Group (HNKJ40-H43) and Xi'an Science and Technology Plan Project (GXKD13.1). |
| About author:: Boshuai Li is a master of Xi'an University of Science and Technology. His research direction is high temperature materials for power station.Ming Zhu, associate professor and master supervisor of Xi'an University of Science and Technology. In 2006, he graduated from Institute of Metals, Chinese Academy of Sciences, majoring in materials science and enginee-ring, with a doctorate in engineering. Mainly engaged in high temperature corrosion mechanism of high temperature structural materials and surface protective coating, material surface modification and metal matrix compo-sites. As the main R & D personnel, he participated inthe research and promotion of key projects including National Natural Science Foundation of China and National Science and Technology Support Program. In recent years, more than 20 papers have been published in academic journals at home and abroad, 15 papers have been searched by SCI and EI, 4 textbooks have been edited or participated in, and 4 invention patents have been obtained. |
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