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Journal of Materials Engineering and Performance

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01-12-2021

Microstructure and Mechanical Properties of Welded Joint of X80 Pipeline Steel before and after Ultrasonic Impact Treatment

Authors: Xueli Wang, Dongpo Wang

Published in: Journal of Materials Engineering and Performance | Issue 2/2022

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Abstract

Microstructure and mechanical properties of welded joints of X80 pipeline steel were investigated to determine the best welding process. Then, numerical simulation and indentation tests were conducted to study the reasonable circumferential distance between two joint junctions of straight weld and girth weld. Results indicate that under 7-layer welding process, the microstructure in weld metal is the finest, the largest content of granular bainite and ferrite was in coarse-grained region and the smallest polygonal ferrite was in fine-grained region, which leads to the desirable tensile strength and impact toughness. For pipe connections, too close circumferential distance between two joint junctions is not conducive to maintaining the performance of pipeline, and the distance of 100 mm is recommended. In addition, ultrasonic impact treatment was applied on weld toes to improve the fatigue properties of welded joints, and surface strengthening mechanism and fatigue fracture mechanism were studied.

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Title: Microstructure and Mechanical Properties of Welded Joint of X80 Pipeline Steel before and after Ultrasonic Impact Treatment
Authors: Xueli Wang
Dongpo Wang
Publication date: 01-12-2021
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 2/2022
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-020-05321-8

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