Investigation on the Low-temperature Impact Toughness of Shielded Metal Arc Welding Weld Metals in Cr-Mo-V Heat-resistant Steel
DONG Wanlong1,2, CAO Rui1,2,*, JIANG Yong3, YANG Fei3, HUANG Yifang3, XU Xiaolong3, CHEN Jianhong1,2
1 Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou 730050,China 3 Sichuan Atlantic Welding Materials Co., Ltd., Zigong 643000,Sichuan,China
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.
作者简介: 董万龙,博士研究生,2018年获兰州理工大学材料科学学士学位,后硕博连读,主要从事先进金属材料制备、焊缝强韧性方面的研究。 曹睿,博士,兰州理工大学教授、博士研究生导师。2000年获武汉理工大学材料科学学士学位,2003年获兰州理工大学材料加工工程硕士学位,2006年获兰州理工大学材料加工工程博士学位。2003年7月至今,在兰州理工大学材料学院工作,2014.1—2015.1美国橡树岭国家实验室访问学者,2016.9—2017.7,清华大学机械系访问学者。主要从事新材料、异种材料的焊接性、强韧性、腐蚀、变形、损伤及断裂行为研究等科研工作。发表SCI检索论文90余篇,发表中文核心期刊论文120余篇。完成Micromechanism of cleavage fracture of metals、《金属解理断裂微观机理》两部著作。完成国家自然科学基金项目、甘肃省科研项目以及企业合作项目40余项。
引用本文:
董万龙, 曹睿, 蒋勇, 杨飞, 黄义芳, 徐晓龙, 陈剑虹. Cr-Mo-V耐热钢焊条电弧焊焊缝金属低温冲击韧性研究[J]. 材料导报, 2022, 36(15): 20120001-5.
DONG Wanlong, CAO Rui, JIANG Yong, YANG Fei, HUANG Yifang, XU Xiaolong, CHEN Jianhong. Investigation on the Low-temperature Impact Toughness of Shielded Metal Arc Welding Weld Metals in Cr-Mo-V Heat-resistant Steel. Materials Reports, 2022, 36(15): 20120001-5.
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2022, Vol. 36 
