Laser-directed energy deposition as a promising dissimilar joining technique: A case study on SS316L and IN718 with CoCrFeNi-based fillers

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialia Pub Date : 2025-03-01 DOI:10.1016/j.mtla.2025.102381

Raj Patel , Shengbiao Zhang , Jiaqi Dong , Marcus H. Hansen , Wen Chen , Kelvin Y. Xie

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Abstract

Dissimilar metal joining is widely used in the automotive and aerospace industries for weight reduction and alloy integration. In this study, CoCrFeNi high-entropy alloy (HEA) and CoCrFeNi +TiB₂ were employed as fillers to join stainless steel 316 L and Inconel 718 using laser-directed energy deposition (L-DED). The rapid cooling and localized melting in L-DED suppressed intermixing, interdiffusion, and the formation of large brittle intermetallics while leading to negligible heat-affected zone. The addition of TiB₂ microparticles to the CoCrFeNi HEA filler refined the microstructure and improved mechanical properties. TiB₂, acting as a reactive inoculant, decomposed during the process to form Cr-rich and Ti-rich inter-dendritic cellular structures, enhancing the hardness and tensile strength of the weld zone, and the ductility of the joined parts. The combined use of L-DED and reactive inoculants demonstrates the potential to expand material options for dissimilar metal joining, enabling stronger and tougher weld zones for advanced engineering applications.

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来源期刊

Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.40

自引率

2.90%

发文量

345

审稿时长

36 days

期刊介绍： Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).