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Published in: Journal of Materials Engineering and Performance 9/2022

18-03-2022 | Technical Article

Microstructure and Mechanical Properties of 800-MPa-Class High-Strength Low-Alloy Steel Part Fabricated by Wire Arc Additive Manufacturing

Authors: Qian Fang, Lin Zhao, Baoxi Liu, Cuixin Chen, Yun Peng, Zhiling Tian, Fuxing Yin

Published in: Journal of Materials Engineering and Performance | Issue 9/2022

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Abstract

Wire and arc additive manufacturing (WAAM) is a viable technique to fabricate low to medium geometric complexity and medium to large structural components. High-strength low-alloy (HSLA) steels have been widely used in pressure vessels, structural applications and marine and shipbuilding industries. In this study, an 800-MPa-class HSLA steel block part was manufactured by a WAAM system based on a gas metal arc welding system. The microstructure and mechanical properties were investigated. The results show that the microstructure was predominantly martensite/bainite (M/B). The deposit exhibits excellent strength–ductility balance. The average yield strength and fracture elongation exceed 840 MPa and 16%, respectively, for samples extracted from different directions of the deposit. Meanwhile, the deposit exhibits excellent low-temperature toughness, i.e., the absorbed energy exceeds 100 J at − 50°C. The microhardness varied from 265 to 365 HV, which indicates that there are softened zones as well as hardened zones, which resulted from different thermal histories. This would influence the tensile and impact behaviors of samples taken from different directions of the deposit. This study elucidates an 800-MPa HSLA steel block part with excellent strength–toughness balance fabricated by WAAM, which verifies the fabrication feasibility of a large-scale, high-strength and toughness block part fabricated by WAAM.

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Literature
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Metadata
Title
Microstructure and Mechanical Properties of 800-MPa-Class High-Strength Low-Alloy Steel Part Fabricated by Wire Arc Additive Manufacturing
Authors
Qian Fang
Lin Zhao
Baoxi Liu
Cuixin Chen
Yun Peng
Zhiling Tian
Fuxing Yin
Publication date
18-03-2022
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 9/2022
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-022-06784-7

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