Cr-Mo-V耐热钢焊条电弧焊焊缝金属低温冲击韧性研究

doi:10.11896/cldb.20120001

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Abstract In this work, the reason of the deteriorated low-temperature impact toughness and the instability of toughness of heat-resistant steel weld metals (i.e. multi-layer and multi-pass) obtained by shielded metal arc welding were revealed, the relationship between the microstructure and low-temperature impact toughness in as-welded and after post-weld heat treatment (PWHT) were investigated. The low-temperature impact energy is obtained through the Charpy impact test at -30 ℃. The microstructure is characterized by optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectrum analysis (EDS), etc. It is found that the impact toughness sharply decreases due to a large number of poor plasticity, brittle and hard martensite-austenite (M-A) constituents in as-welded samples. The impact toughness is mainly dependent on the start time of cracking and thereby is determined by the coarsest ferrite grain size in the columnar grain region. The toughness of the weld metal is also affected by different types of microstructures in the weld metals, i.e.: acicular ferrite (AF) with the optimal toughness, the side-plate ferrite (SPF) and grain boundary ferrite (GBF) with inferior toughness and the coarse and massive ferrite with the worst toughness. It is worth noting that an adverse effect on toughness also results from a stress concentration caused by continuously distributed M-A and aggregated carbide clusters.

Key words： shielded metal arc welding heat-resistant steel low-temperature impact toughness grain size martensite-austenite(M-A)

Published: 10 August 2022 Online: 2022-08-15

CLC number:

TG444

Fund:National Natural Science Foundation of China (52175325,51961024, 52071170).

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	Articles by authors
	DONG Wanlong
	CAO Rui
	JIANG Yong
	YANG Fei
	HUANG Yifang
	XU Xiaolong
	CHEN Jianhong

Cite this article:

DONG Wanlong,CAO Rui,JIANG Yong, et al. Investigation on the Low-temperature Impact Toughness of Shielded Metal Arc Welding Weld Metals in Cr-Mo-V Heat-resistant Steel[J]. Materials Reports, 2022, 36(15): 20120001-5.

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http://www.mater-rep.com/EN/10.11896/cldb.20120001 OR http://www.mater-rep.com/EN/Y2022/V36/I15/20120001

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