Achieving illustrious friction on a directed energy deposition 316/NiTi heterogeneous alloy with bionic Ni interlayer

Nie, Ming; Zhou, Yuan; Jiang, Ping; Li, X.R.; Zhu, Dongdong; Shan, Z.H.; Chen, Z.K.; Zhang, Zhihui

doi:10.1016/j.apsusc.2023.158107

Cited by 18 publications

(1 citation statement)

References 45 publications

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“…It should be noted that the 316L/NiTi multi-material obtained via SLM is of great interest [18]. However, this multi-material, like the other multi-materials with 316L mentioned above, may exhibit defects and cracks in the interfacial zone.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Characterization of Selective Laser Melting of a SS316L/NiTi Multi-Material with a High-Entropy Alloy Interlayer

Repnin,

Kim,

Popovich

2023

Crystals

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Some multi-materials produced via SLM and containing 316L steel may exhibit defects and cracks in the interfacial zone. There is a lack of research on 316L/NiTi multi-materials with an interlayer produced via SLM. This study aims to investigate the influence of a high-entropy alloy (HEA)—CoCrFeNiMn interlayer on the defects’ formation, microstructure, phase, and chemical compositions, as well as the hardness of the interfacial zone. It was concluded that using of high-entropy alloy as an interlayer in the production of 316L/HEA/NiTi multi-material via SLM is questionable, since numerous cracks and limited pores occurred in the HEA/NiTi interfacial zone. The interfacial zone has an average size of 100–200 μm. Microstructure studies indicate that island macrosegregation is formed in the interfacial zone. The analysis of phase, chemical composition, and hardness demonstrates that a small amount of FeTi may form in the island macrosegregation. The increase in iron content in this area could be the reason for this. The interfacial zone has a microhardness of about 430 HV, and in the island macrosegregation, the microhardness increases to about 550 HV. Further research could involve an in-depth analysis of the phase and chemical composition, as well as examining other metals and alloys as interlayers.

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Section: Introductionmentioning

confidence: 99%

Interfacial Characterization of Selective Laser Melting of a SS316L/NiTi Multi-Material with a High-Entropy Alloy Interlayer

Repnin,

Kim,

Popovich

2023

Crystals

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Evaluation of Interface and Residual Strain of NiTi Layer Deposited on NiTiX Substrate by Laser Powder Bed Fusion

Memarian,

Mohri,

Golrang

et al. 2024

Adv Eng Mater

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This study investigates the microstructure and properties of functionally graded NiTi alloy bi‐layers. The NiTi layer is printed by laser powder bed fusion on a NiTiX (where X is Hf or Cu) substrate prepared by vacuum arc remelting. Specimens produced with different thicknesses of layers, but constant thickness ratio, are examined by optical and scanning electron microscopy prior to and post‐annealing process at 1000 °C for 16 h. SEM‐EDX and transmission electron microscopy studies reveal the presence of Ti2Ni and Ni4Ti3 precipitates in the as‐printed NiTi/NiTiCu samples and Ti2Ni type precipitates in as‐printed NiTi/NiTiHf. Digital image correlation quantifies residual strain in the as‐printed bi‐layer and enables strain relief to be monitored during heating. It has been shown that microcracks occurring along interfacial zones during the laser powder bed fusion are diminished after annealing heat treatment. The microcrack closure occurs by diffusion of third elements to the open microcracks, leading to precipitation and accumulation of third elements in the interfaces. Eventually, the as‐printed NiTi/NiTiCu sample displays two‐way shape memory effects with about 24.5% shape recovery. This work enhances understanding of controlling fabrication to yield tailored properties in additively manufactured functionally graded NiTi‐based materials.This article is protected by copyright. All rights reserved.

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Processing Challenges and Delamination Prevention Methods in Titanium-Steel DED 3D Printing

Andreu,

Kim,

Kim

et al. 2024

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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Direct Energy Deposition (DED) 3D printing has gained significant importance in various industries due to its ability to fabricate complex and functional parts with reduced material waste, and to repair existing components. Titanium alloys, known for their exceptional mechanical properties and biocompatibility, are widely used in DED 3D printing applications, where they offer benefits such as lightweight design possibilities and high strength-to-weight ratio. However, given the high material cost of titanium alloys, certain applications can benefit from the coating capabilities of DED to achieve the advantages of titanium on a distinct material substrate. Nevertheless, challenges related to material incompatibility and the development of unwanted brittle phases still affect the successful deposition of titanium alloys on steel substrates with DED 3D printing. This paper investigates the processing challenges and reviews delamination prevention methods, specifically targeting titanium-steel interfaces. In particular, the formation of unwanted brittle Ti–Fe intermetallics and methods to circumvent their formation are explored. The findings of this research contribute to a deeper understanding of the processing challenges and delamination prevention methods in DED 3D printing.

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Achieving illustrious friction on a directed energy deposition 316/NiTi heterogeneous alloy with bionic Ni interlayer

Cited by 18 publications

References 45 publications

Interfacial Characterization of Selective Laser Melting of a SS316L/NiTi Multi-Material with a High-Entropy Alloy Interlayer

Interfacial Characterization of Selective Laser Melting of a SS316L/NiTi Multi-Material with a High-Entropy Alloy Interlayer

Evaluation of Interface and Residual Strain of NiTi Layer Deposited on NiTiX Substrate by Laser Powder Bed Fusion

Processing Challenges and Delamination Prevention Methods in Titanium-Steel DED 3D Printing

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