影响P91耐热钢焊缝金属冲击韧性的因素分析

doi:10.11896/cldb.22080097

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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.

Key words： P91 heat-resistant steel impact toughness M₂₃C₆ carbide

Published: 10 February 2024 Online: 2024-02-19

CLC number:

TG441

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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	Articles by authors
	LI Wenqing
	CAO Rui
	YANG Fei
	XU Xionglong
	MAO Xinggui
	JIANG Yong
	YAN Yingjie

Cite this article:

LI Wenqing,CAO Rui,YANG Fei, et al. Analysis of Factors Affecting the Impact Toughness of P91 Heat-resistant Steel Weld Metal[J]. Materials Reports, 2024, 38(3): 22080097-5.

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http://www.mater-rep.com/EN/10.11896/cldb.22080097 OR http://www.mater-rep.com/EN/Y2024/V38/I3/22080097

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