Wire arc additive manufacturing of CuAl8Ni2/42CrMo bimetallic deposition: microstructure and properties

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2025-01-14 DOI:10.1007/s10853-024-10578-8

Zheng Xu, Xianfen Li, Siyuan Li, Ruize Jiang, Peng Hua, Dashuang Liu

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引用次数: 0

Abstract

Due to its remarkable strength and toughness, 42CrMo steel finds extensive application in shipbuilding as well as various industrial sectors. Nevertheless, it exhibits inadequate surface corrosion resistance and is prone to damage from prolonged exposure within marine environments. In order to improve its surface corrosion resistance, multi-pass nickel–aluminum bronze (NAB) alloy deposition layers were prepared on the surface of 42CrMo steel using wire arc additive manufacturing (WAAM) technology, and the effect of overlap rate on the microstructure and properties of the deposition layers was investigated thoroughly. The results show that the CuAl8Ni2/42CrMo bimetallic deposition exhibits excellent metallurgical bonding and properties. The deposited layer contains various phase structures of α-Cu phase, β/β′ phase, and weak κ phase. With the increase in overlap rate, the microstructure of the overlap region changes with the increase in iron-rich dendrites and coarse columnar crystals, and the increase of element diffusion at the interface. The microhardness of the deposited layer peaks at 40% overlap rate (159.5 HV), and the highest tensile strength (628.8 MPa) appears in the parallel weld direction of the sample at 30% overlap rate. 40% overlap rate also exhibits the best corrosion resistance, with a corrosion current density (I_corr) of 6.559 μA/cm², and the corrosion rate decreases to 0.0341 mm/y after 27 days of static immersion, which is attributable to the formation of Al₂O₃ and Cu₂O protective films formed on the surface effectively mitigated the corrosion.

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.