焊后热处理对Q690高强钢焊缝金属冲击韧性的影响

doi:10.11896/cldb.24010076

Abstract
Figure/Table
References
Related Citation (14)

Download:

Full Text ( PDF ) (54797KB)
Export: BibTeX | EndNote (RIS)

Abstract The effect of post-welding heat treatment on the weld metal impact toughness of Q690 high strength steel was investigated by Charpy impact test, OM, SEM and EBSD. The results show that the impact toughness deteriorates after heat treatment, but the impact toughness improves with the increase of heat treatment temperature. According to the microstructure near the cracking origin, it is found that coarse massive ferrite is appeared near the cracking origin in all specimens, and the massive ferrite in the two-phase zone in the middle of the weld metal is the largest because the weld metal is in an overheated state. Combined with the relationship between the impact work and the grain size of the massive ferrite in the middle two-phase zone, the massive ferrite in the middle two-phase zone becomes a weakest area, which causes final cracking. The reason for the influence of heat treatment on the impact toughness is that during the heat treatment process, the weld metal has a recovery effect, and the fine packets are combined into the coarse massive ferrite that causes cracking, which decreases the fraction of the large angle grain boundaries with strong hindering ability. Coupled with the precipitation of carbide at the grain boundaries, the grain boundary embrittlement occurs, which makes the impact toughness fracture mode deteriorate from ductile fracture of the as-welded state to mixed fracture of the heat-treated state. However, with the increase of heat treatment temperature, the coarse massive ferrite began to be divided into smaller phases, which leads to the increase of the impact energy.

Key words： Q690 high strength steel weld metal impact toughness massive ferrite

Published: 25 February 2025 Online: 2025-02-18

CLC number:

TG441

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	JIAO Jijun
	CAO Rui
	LI Yimin
	WANG Congyuan
	HE Weiping
	YAN Yingjie

Cite this article:

JIAO Jijun,CAO Rui,LI Yimin, et al. Effect of Post-welding Heat Treatment on Impact Toughness of Q690 High Strength Steel Welded Metal[J]. Materials Reports, 2025, 39(4): 24010076-8.

URL:

https://www.mater-rep.com/EN/10.11896/cldb.24010076 OR https://www.mater-rep.com/EN/Y2025/V39/I4/24010076

1 Wang H H, Li G Q, Wan X L, et al. Science and Technology of Welding and Joining, 2017, 22, 133.
2 Cheng P, Liu J, Huang X, et al. Construction and Building Materials, 2022, 328, 127030.
3 Al-Jabri K S, Lennon T, Burgess I W, et al. Journal of Constructional Steel Research, 1998, 46(1-3), 308.
4 Zhang J, Liu X, Kan W, et al. Journal of Earthquake Engineering, 2023, 27(8), 2088.
5 Zhang Y Q. Investigation on the strengthening and toughening mechanism of high strength steel in the heat affected zone during welding for crude oil storage tank. Ph. D. Thesis, Shanghai Jiao Tong University, China, 2009 (in Chinese).
张英乔. 原油储罐用高强钢焊接热影响区强韧化机理研究. 博士学位论文, 上海交通大学, 2009.
6 Wan X L, Wu K M, Huang G, et al. Science & Technology of Welding & Joining, 2016, 21(4), 295.
7 Pamnani R, Jayakumar T, Vasudevan M, et al. Journal of Manufacturing Processes, 2016, 21, 75.
8 Yin F X, Li X C, Chen C X, et al. Journal of Iron and Steel Research International, 2021, 28(7), 853.
9 Lu S P, Wang X, Dong W C, et al. ISIJ International, 2013, 53(1), 96.
10 An T B, Tian Z L, Dan J G, et al. Chinese Journal of Mechanical Engineering, 2015, 51(4), 7 (in Chinese).
安同邦, 田志凌, 单际国, 等. 机械工程学报, 2015, 51(4), 7.
11 Liu G. Study on impact toughness stability of multi-layer and multi-pass welded metal of thick heat-resistant steel plate. Master’s Thesis, Lanzhou University of Technology, China, 2019 (in Chinese).
刘刚. 耐热钢厚板多层多道焊缝金属冲击韧性稳定性研究. 硕士学位论文, 兰州理工大学, 2019.
12 Zhuo X. Study on microstructure and properties of welded metal of 420 MPa high toughness and weather resistant steel. Master’s Thesis, Hebei University of Science & Technology, China, 2019 (in Chinese).
卓晓. 420 MPa级高韧耐候焊条熔敷金属组织和性能研究. 硕士学位论文, 河北科技大学, 2019.
13 Hu T, Wu R M, Li F J, et al. Die & Mould Industry, 2021, 47(12), 7 (in Chinese).
胡涛, 吴日铭, 李方杰, 等. 模具工业, 2021, 47(12), 7.
14 Yi M. Iron Steel Vanadium, 2017, 38(1), 6 (in Chinese).
佚名. 钢铁钒钛, 2017, 38(1), 6.
15 Cui G B, Ju X H, Wang Z Y, et al. Heat Treatment of Metals, 2020, 45(9), 6 (in Chinese).
崔桂彬, 鞠新华, 王泽阳, 等. 金属热处理, 2020, 45(9), 6.
16 Puttick K E. Nature, 1972, 235(5338), 402.
17 Zuo Y, Kang J, An T B, et al. Pressure Vessel Technology, 2021, 38(12), 7 (in Chinese).
左月, 康举, 安同邦, 等. 压力容器, 2021, 38(12), 7.
18 Curry D A, Knott J F. Metal Science, 1979, 13, 341.
19 Wang C, Wang M, Shi J, et al. Scripta Materialia, 2008, 58, 492.
20 Deng B, Yang D, Wang G, et al. Materials, 2021, 14(4), 1000.
21 Bhadeshia H, Christian J. Metallurgical Transactions A, 1990, 21(3), 767.
22 Dong W L, Cao R, Jiang Y, et al. Materials Reports, 2022, 36(15), 5 (in Chinese).
董万龙, 曹睿, 蒋勇, 等. 材料导报, 2022, 36(15), 5.