METALS AND METAL MATRIX COMPOSITES |
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Analysis of Factors Affecting the Impact Toughness of P91 Heat-resistant Steel Weld Metal |
LI Wenqing1, CAO Rui1,*, YANG Fei2, XU Xionglong2, MAO Xinggui2, JIANG Yong2, YAN Yingjie1
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1 The State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 Sichuan Atlantic Welding Materials Co., Ltd., Zigong 643000, Sichuan, China |
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Abstract The reasons for the instability of the impact toughness of P91 heat-resistant steel weld metal were investigated by scanning electron microscope, optical microscope, X-ray diffraction and electrolytic extraction experiment. The results show that the microstructure of the weld metal is mainly composed of ferrite and a large number of precipitates distributed at the ferrite matrix and grain boundary. The precipitates mainly consist of M23C6 carbide and oxide inclusions, among which aggregated M23C6 is the main reason affecting the impact toughness of the weld metal. According to the statistics of the area fraction of carbides at grain boundaries for specimens with different impact toughness values, it is found that the increase of M23C6 area fraction leads to the decrease of the impact toughness of the weld metal.
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Published: 10 February 2024
Online: 2024-02-19
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Fund:National Natural Science Foundation of China (52175325,51961024,52071170) and ‘Double First-class' Key Research Project of Gansu Provincial Department of Education (GSSYLXM-03). |
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