| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Different Degree of Carbide Aggregation in P91 Steel Weld Metal on the Impact Toughness of Weld Metal |
| LI Wenqing1,2, MA Jingping1,2, CAO Rui1,2,*, XU Xiaolong3, YANG Fei3, MAO Xinggui3, JIANG Yong3, YAN Yingjie1,2
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1 The State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
3 Atlantic China Welding Consumables, INC, Zigong 643000, Sichuan, China |
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Abstract The impact toughness of P91 weld metal was studied by using impact testing, SEM and EBSD testing to investigate the effect of different degrees of carbide aggregation at grain boundaries in the microstructure of the weld metal. The results indicate that the microstructure of as welded state is different from that of heat treated state. The microstructure of as welded state is untempered flat noodles martensite, while that of heat treated state is ferrite. Carbides aggregate in the form of particle chains along grain boundaries, and the phenomenon of micropores and their aggregation around the carbides has been observed. Under the action of force, carbide particles undergo stress concentration, forming micropores around the carbide. The higher the degree of aggregation of carbide particle chains at grain boundaries, the higher the volume fraction of micropores, and the rapid aggregation of micropores to form cracks, resulting in a decrease in impact toughness. The precipitates in the matrix exhibit a dispersed distribution, and the more precipitates there are, the more significant the dispersion strengthening effect of the matrix is, and the impact toughness decreases. The EBSD results indicate that a large amount of M23C6 type carbides are distributed at the grain boundaries, and there is also a small amount of M23C6 type carbides in the matrix.
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Published: 25 October 2024
Online: 2024-11-05
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| Fund:National Natural Science Foundation of China (52175325,51961024,52071170), Gansu Provincial Science and Technology Major Project (22ZD6GA008). |
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2024, Vol. 38 
