Performance and strain evolution of different strength matching girth welds of high Nb X80 pipeline

被引：0
|
作者：
He X. [1 ,2 ]
Gao X. [1 ,2 ]
Han D. [2 ]
Chi Q. [1 ,2 ]
Huo C. [1 ,2 ]
Bacalhau J.B. [3 ]
机构：
[1] CNPC Tubular Goods Research Institute, State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an
[2] International Welding Technology Center, Xi'an
[3] Companhia Brasileira de Metalurgia e Mineração, Sao Paulo
来源：
Hanjie Xuebao/Transactions of the China Welding Institution | 2022年 / 43卷 / 02期
关键词：
DIC; Girth weld; High Nb X80; Strain accumulation; Strength matching;
D O I：
10.12073/j.hjxb.20210330004
中图分类号：
学科分类号：
摘要：
In order to investigate the fracture mechanism of pipeline girth weld, The microstructure and properties of high niobium X80 girth welds with different strength matching were tested and analyzed, and the strain behavior of the welded joints during tensile load was observed by digital image correlation (DIC) method. The results show that the FCAW-S girth welded joints of high Nb X80 pipe with low strength matching and high strength matching have good impact toughness, and the average Charpy impact absorption energy of the two joints is similar. The toughness dispersion in the heat-affected zone (HAZ) is mainly caused by the microstructure heterogeneity of coarse-grain zone. The carbon equivalent (CEIIW)of high Nb X80 pipeline steel is low, and the HAZ of girth weld joint is softened to a certain extent. Under axial tensile load, regardless of low strength matching or high strength matching, strain concentration first appears in the root weld and heat affected zone of girth weld. With the increase of tensile load, the strain concentration of the high-strength matched girth weld joint gradually shifts from the root weld and HAZ to the base metal, and the ability of the pipe to bear axial load and deformation is greater than that of the low-strength matched girth weld joint. However, for low strength matching, even with good toughness, the girth welding joints will fracture due to the accumulation of plastic strain in the weld and HAZ. Copyright © 2022 Transactions of the China Welding Institution. All rights reserved.
引用
收藏
页码：34 / 39
页数：5
相关论文
共 12 条
  • [1] Gray J Malcolm, Siciliano F., High strength microalloyed linepipe: Half a Century of Evolution, Proceedings of the Fifth International Conference on Pipeline Technology, pp. 12-14, (2009)
  • [2] Stalheim D G., The use of high temperature processing (HTP) steel for high strength oil and gas transmission pipeline application, Iron & Steel, 40, pp. 699-704, (2005)
  • [3] Reip C P, Shanmugam S, Misra R D K., High strength microalloyed C-Mn(V-Nb-Ti) and C-Mn (V-Nb) pipeline steels processed through CSP thin-slab technology: microstructure, precipitation and mechanical properties, Materials Science and Engineering: A, 424, 1, pp. 307-317, (2006)
  • [4] Shang Chengjia, Wang Xiaoxiang, Liu Qingyou, Et al., Weldability of low carbon and high niobium X80 bipeline steel and its engineering practice, Welded Pipe and Tube, 35, 12, pp. 11-18, (2012)
  • [5] Cui Bing, Yan Peipei1, Du Quanbin, Et al., The welding application of high strength steels used in engineering machinery, China Welding, 30, 1, pp. 57-63, (2021)
  • [6] Wang Honghui, Dong Shulei, Qian Jiankang, Et al., Microstructure and properties of automatic welding process of X80 pipeline steel under extremely cold conditions, Trasactions of the China Welding Institution, 41, 11, pp. 83-88, (2020)
  • [7] Wang Haitao, Li Shili, Chen Shan, Et al., Fracture of gas pipeline girth welds with high grade steel, Petroleum Tubular Goods & Instruments, 6, 2, pp. 49-52, (2020)
  • [8] Jing Hongyang, Huo Lixing, Zhang Yufeng, Effect of niobium on mophology of martensite-austenite constituents in weld HAZ, Trasactions of the China Welding Institution, 18, 1, pp. 37-42, (1997)
  • [9] Yan Han, Zhao Di, Qi Tongfu, Et al., Effect of element Nb on microstructures and impact toughness of CGHAZ in TiNbV micro-alloyed steels, Trasactions of the China Welding Institution, 41, 12, pp. 33-37, (2020)
  • [10] Qiao Guiying, Guo Baofeng, Chen Xiaowei, Fluence of thermal cycle on impact toughness of HAZ of high-Nb pipeline steel, Heat Treatmet of Metals, 34, 12, pp. 32-34, (2009)
12