Investigation on the Low-temperature Impact Toughness of Shielded Metal Arc Welding Weld Metals in Cr-Mo-V Heat-resistant Steel

被引：0

作者：

Dong W. ^{[1
,2
]}

Cao R. ^{[1
,2
]}

Jiang Y. ^{[3
]}

Yang F. ^{[3
]}

Huang Y. ^{[3
]}

Xu X. ^{[3
]}

Chen J. ^{[1
,2
]}

机构：

[1] Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou

[2] State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou

[3] Sichuan Atlantic Welding Materials Co., Ltd., Sichuan, Zigong

来源：

Cailiao Daobao/Materials Reports | 2022年 / 36卷 / 15期

基金：

中国国家自然科学基金;

关键词：

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

D O I：

10.11896/cldb.20120001

中图分类号：

学科分类号：

摘要：

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. © 2022 Cailiao Daobaoshe/ Materials Review. All rights reserved.

引用

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