Microstructure and mechanical properties of submerged arc welded medium-thickness Q690qE high-strength steel plate joints

Submerged arc welding method was used to weld 40 mm thickness Q690qE high-strength steel to study the influence of welding heat input on the microstructure and properties of Q690qE joints. The result shows that welded seam with full penetration and no obvious defects is achieved in the Q690qE joints...

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Main Authors: Huang Wen, Qi Kai, Liu Zhigang, Yang Liang, Xue Zheyan, Li Taotao, Zhang Xiaoqiang, Li Ruifeng
Format: Article
Language:English
Published: De Gruyter 2024-12-01
Series:High Temperature Materials and Processes
Subjects:
Online Access:https://doi.org/10.1515/htmp-2024-0033
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author Huang Wen
Qi Kai
Liu Zhigang
Yang Liang
Xue Zheyan
Li Taotao
Zhang Xiaoqiang
Li Ruifeng
author_facet Huang Wen
Qi Kai
Liu Zhigang
Yang Liang
Xue Zheyan
Li Taotao
Zhang Xiaoqiang
Li Ruifeng
author_sort Huang Wen
collection DOAJ
description Submerged arc welding method was used to weld 40 mm thickness Q690qE high-strength steel to study the influence of welding heat input on the microstructure and properties of Q690qE joints. The result shows that welded seam with full penetration and no obvious defects is achieved in the Q690qE joints when the welding heat input ranges from 22.5 to 33.6 kJ·cm−1. The microstructure of welded seam mainly consists of acicular ferrite and granular bainite (GB), the microstructure in coarse-grain zone is GB and lath martensite. As the welding heat input increases, the microstructure of coarse-grain zone becomes lath bainite (LB) and a small amount of GB and the microhardness decreases. The microstructure of the fine-grained area mainly includes ferrite, GB, and a small quantity of LB. In terms of impact toughness, with the heat input increasing, the impact toughness at the center of welded seam and the heat-affected zone decreases subsequently. The tensile test results of the welded joints show that the fracture always occurs in the parent material area, with a tensile strength higher than 864 MPa, and the elongation after fracture decreases as the heat input increases.
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id doaj-art-9f83145da4fa410c97282936d3dd052a
institution Kabale University
issn 2191-0324
language English
publishDate 2024-12-01
publisher De Gruyter
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series High Temperature Materials and Processes
spelling doaj-art-9f83145da4fa410c97282936d3dd052a2025-01-07T07:55:51ZengDe GruyterHigh Temperature Materials and Processes2191-03242024-12-01431pp. 23524910.1515/htmp-2024-0033Microstructure and mechanical properties of submerged arc welded medium-thickness Q690qE high-strength steel plate jointsHuang Wen0Qi Kai1Liu Zhigang2Yang Liang3Xue Zheyan4Li Taotao5Zhang Xiaoqiang6Li Ruifeng7School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, 212100, ChinaSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, 212100, ChinaChina Railway Baoji Bridge (Yangzhou) Co. Ltd., Yangzhou, Jiangsu, 225107, ChinaChina Railway Baoji Bridge (Yangzhou) Co. Ltd., Yangzhou, Jiangsu, 225107, ChinaChina Railway Baoji Bridge (Yangzhou) Co. Ltd., Yangzhou, Jiangsu, 225107, ChinaSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, 212100, ChinaSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, 212100, ChinaSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, 212100, ChinaSubmerged arc welding method was used to weld 40 mm thickness Q690qE high-strength steel to study the influence of welding heat input on the microstructure and properties of Q690qE joints. The result shows that welded seam with full penetration and no obvious defects is achieved in the Q690qE joints when the welding heat input ranges from 22.5 to 33.6 kJ·cm−1. The microstructure of welded seam mainly consists of acicular ferrite and granular bainite (GB), the microstructure in coarse-grain zone is GB and lath martensite. As the welding heat input increases, the microstructure of coarse-grain zone becomes lath bainite (LB) and a small amount of GB and the microhardness decreases. The microstructure of the fine-grained area mainly includes ferrite, GB, and a small quantity of LB. In terms of impact toughness, with the heat input increasing, the impact toughness at the center of welded seam and the heat-affected zone decreases subsequently. The tensile test results of the welded joints show that the fracture always occurs in the parent material area, with a tensile strength higher than 864 MPa, and the elongation after fracture decreases as the heat input increases.https://doi.org/10.1515/htmp-2024-0033q690qe high-strength steelsubmerged arc weldingwelding heat inputmicrostructuremechanical properties
spellingShingle Huang Wen
Qi Kai
Liu Zhigang
Yang Liang
Xue Zheyan
Li Taotao
Zhang Xiaoqiang
Li Ruifeng
Microstructure and mechanical properties of submerged arc welded medium-thickness Q690qE high-strength steel plate joints
High Temperature Materials and Processes
q690qe high-strength steel
submerged arc welding
welding heat input
microstructure
mechanical properties
title Microstructure and mechanical properties of submerged arc welded medium-thickness Q690qE high-strength steel plate joints
title_full Microstructure and mechanical properties of submerged arc welded medium-thickness Q690qE high-strength steel plate joints
title_fullStr Microstructure and mechanical properties of submerged arc welded medium-thickness Q690qE high-strength steel plate joints
title_full_unstemmed Microstructure and mechanical properties of submerged arc welded medium-thickness Q690qE high-strength steel plate joints
title_short Microstructure and mechanical properties of submerged arc welded medium-thickness Q690qE high-strength steel plate joints
title_sort microstructure and mechanical properties of submerged arc welded medium thickness q690qe high strength steel plate joints
topic q690qe high-strength steel
submerged arc welding
welding heat input
microstructure
mechanical properties
url https://doi.org/10.1515/htmp-2024-0033
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