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The Evolution and Distribution of Microstructures in High-Energy Laser-Welded X100 Pipeline Steel

High-energy beam welding was introduced for pipeline steel welding to reduce pipeline construction costs and improve the efficiency and safety of oil and gas transportation. Microstructures and their distribution in X100 laser-welded joints, which determine the joints’ strength and toughness, are di...

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Autores principales: Wang, Gang, Yin, Limeng, Yao, Zongxiang, Wang, Jinzhao, Jiang, Shan, Zhang, Zhongwen, Zuo, Cunguo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6600716/
https://www.ncbi.nlm.nih.gov/pubmed/31151237
http://dx.doi.org/10.3390/ma12111762
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author Wang, Gang
Yin, Limeng
Yao, Zongxiang
Wang, Jinzhao
Jiang, Shan
Zhang, Zhongwen
Zuo, Cunguo
author_facet Wang, Gang
Yin, Limeng
Yao, Zongxiang
Wang, Jinzhao
Jiang, Shan
Zhang, Zhongwen
Zuo, Cunguo
author_sort Wang, Gang
collection PubMed
description High-energy beam welding was introduced for pipeline steel welding to reduce pipeline construction costs and improve the efficiency and safety of oil and gas transportation. Microstructures and their distribution in X100 laser-welded joints, which determine the joints’ strength and toughness, are discussed in this paper. Welded joints were prepared by an automatic 10,000-watt robot-based disc laser-welding platform for 12.8 mm thick X100 pipeline steel. Then, the grain, grain boundary, orientation, and distribution pattern of each zone of the welded joints were studied by optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and electron backscattered diffraction (EBSD) analysis techniques. The results showed that the grain boundary density, contents of the high-angle and low-angle grain boundaries, distribution states, and evolution trends of coincident site lattice (CSL) grain boundaries were essentially the same in each zone from the base metal (BM) to the weld of the X100 pipeline steel laser-welded joint. The relative content of grain boundaries above 55°, which were composed of the Σ3 type CSL grain boundary, showed a considerable impact on the mechanical properties of the joint. The content of twin grain boundaries was closely related to the thermal cycles of laser welding, and the effect of the cooling rate was greater than that of the process of austenization.
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spelling pubmed-66007162019-07-16 The Evolution and Distribution of Microstructures in High-Energy Laser-Welded X100 Pipeline Steel Wang, Gang Yin, Limeng Yao, Zongxiang Wang, Jinzhao Jiang, Shan Zhang, Zhongwen Zuo, Cunguo Materials (Basel) Article High-energy beam welding was introduced for pipeline steel welding to reduce pipeline construction costs and improve the efficiency and safety of oil and gas transportation. Microstructures and their distribution in X100 laser-welded joints, which determine the joints’ strength and toughness, are discussed in this paper. Welded joints were prepared by an automatic 10,000-watt robot-based disc laser-welding platform for 12.8 mm thick X100 pipeline steel. Then, the grain, grain boundary, orientation, and distribution pattern of each zone of the welded joints were studied by optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and electron backscattered diffraction (EBSD) analysis techniques. The results showed that the grain boundary density, contents of the high-angle and low-angle grain boundaries, distribution states, and evolution trends of coincident site lattice (CSL) grain boundaries were essentially the same in each zone from the base metal (BM) to the weld of the X100 pipeline steel laser-welded joint. The relative content of grain boundaries above 55°, which were composed of the Σ3 type CSL grain boundary, showed a considerable impact on the mechanical properties of the joint. The content of twin grain boundaries was closely related to the thermal cycles of laser welding, and the effect of the cooling rate was greater than that of the process of austenization. MDPI 2019-05-30 /pmc/articles/PMC6600716/ /pubmed/31151237 http://dx.doi.org/10.3390/ma12111762 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Gang
Yin, Limeng
Yao, Zongxiang
Wang, Jinzhao
Jiang, Shan
Zhang, Zhongwen
Zuo, Cunguo
The Evolution and Distribution of Microstructures in High-Energy Laser-Welded X100 Pipeline Steel
title The Evolution and Distribution of Microstructures in High-Energy Laser-Welded X100 Pipeline Steel
title_full The Evolution and Distribution of Microstructures in High-Energy Laser-Welded X100 Pipeline Steel
title_fullStr The Evolution and Distribution of Microstructures in High-Energy Laser-Welded X100 Pipeline Steel
title_full_unstemmed The Evolution and Distribution of Microstructures in High-Energy Laser-Welded X100 Pipeline Steel
title_short The Evolution and Distribution of Microstructures in High-Energy Laser-Welded X100 Pipeline Steel
title_sort evolution and distribution of microstructures in high-energy laser-welded x100 pipeline steel
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6600716/
https://www.ncbi.nlm.nih.gov/pubmed/31151237
http://dx.doi.org/10.3390/ma12111762
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