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

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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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Acknowledgments

This work was supported by the National Key R&D Program of China (Grant Numbers 2017YFB1103700 and 2017YFB1103703) and the Joint Doctoral Training Foundation of Hebei University of Technology (Grant Number 2018GN0003). The authors would like to thank Dr Dayue Zhang and Hongjian Zhao for proofreading the article.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Research Institute for Energy Equipment Materials, TianJin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology, Hebei University of Technology, TianJin, 300132, China

    Qian Fang, Baoxi Liu, Cuixin Chen & Fuxing Yin

  2. Central Iron and Steel Research Institute, BeiJing, 100081, China

    Qian Fang, Lin Zhao, Yun Peng & Zhiling Tian

Authors
  1. Qian Fang
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  2. Lin Zhao
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  3. Baoxi Liu
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  4. Cuixin Chen
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  5. Yun Peng
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  6. Zhiling Tian
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  7. Fuxing Yin
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Contributions

QF involved in conceptualization, investigation, data curation, writing—original draft. LZ took part in funding acquisition, writing—review & editing. BL involved in writing—review & editing. CC involved in writing—review & editing. YP took part in project administration. ZT involved in supervision. FY took part in supervision.

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Correspondence to Lin Zhao or Fuxing Yin.

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Fang, Q., Zhao, L., Liu, B. et al. Microstructure and Mechanical Properties of 800-MPa-Class High-Strength Low-Alloy Steel Part Fabricated by Wire Arc Additive Manufacturing. J. of Materi Eng and Perform 31, 7461–7471 (2022). https://doi.org/10.1007/s11665-022-06784-7

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  • DOI: https://doi.org/10.1007/s11665-022-06784-7

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