Microstructure and mechanical property of Ti and Ti6Al4V prepared by an in-situ shot peening assisted cold spraying

Luo, Xiao-Tao; Wei, Ying-Kang; Wang, Yan; Li, Chang-Jiu

doi:10.1016/j.matdes.2015.07.015

Cited by 161 publications

(55 citation statements)

References 28 publications

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“…Although the term of peening effect or tamping effect in cold spray has been proposed for a long time, most of the studies focused on its effect on coating porosity and microstructure (Ref 36,39). No attention was drawn on the influence of peening effect on adhesion strength of a coldsprayed coating.…”

Section: Discussionmentioning

confidence: 99%

Strengthened Peening Effect on Metallurgical Bonding Formation in Cold Spray Additive Manufacturing

et al. 2019

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Cold spraying is a solid-state coating process and promising technique for additive manufacturing. However, questions raise about the bonding mechanism between the particles forming the coating. In this study, the strengthened peening effect is proposed as the determining factor for the formation of metallurgical bonding in cold spray additive manufacturing. Ni coatings and single splats were produced on Al substrates with different propelling gas pressures. Contrary to common understanding, no metallurgical bonding was observed in single-particle impact, even at the pressure of 3.7 MPa. However, the metallurgical bonding was observed at the full coating deposition through the existence of diffusion after heat treatment. Thus, the strengthened peening effect of subsequent particles with successive impact energy might be the determining factor for the formation of metallurgical bonding. Actually, strengthened peening effect significantly improved the coating quality through enhanced metallurgical bonding, which was proved by the increasing adhesion strength and decreasing porosity.

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Section: Discussionmentioning

confidence: 99%

Strengthened Peening Effect on Metallurgical Bonding Formation in Cold Spray Additive Manufacturing

et al. 2019

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“…0.01%) was reported by Jahedi et al [112]. According to the study by Vo et al [113], the porosities of the CSed Ti-6Al-4V deposits using helium gas was lower by one order of magnitude than that nitrogen gas due to higher level of particle acceleration. The use of in-situ peening technique [114] (i.e., mixing of build powder with large ceramic powders), could result in dense Ti and Ti-6Al-4V deposits using cheaper nitrogen gas due to the "tamping effect" of CS [115].…”

Section: Cold Spray Am (Csam)mentioning

confidence: 74%

Beamless Metal Additive Manufacturing

2020

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The propensity to manufacture functional and geometrically sophisticated parts from a wide range of metals provides the metal additive manufacturing (AM) processes superior advantages over traditional methods. The field of metal AM is currently dominated by beam-based technologies such as selective laser sintering (SLM) or electron beam melting (EBM) which have some limitations such as high production cost, residual stress and anisotropic mechanical properties induced by melting of metal powders followed by rapid solidification. So, there exist a significant gap between industrial production requirements and the qualities offered by well-established beam-based AM technologies. Therefore, beamless metal AM techniques (known as non-beam metal AM) have gained increasing attention in recent years as they have been found to be able to fill the gap and bring new possibilities. There exist a number of beamless processes with distinctively various characteristics that are either under development or already available on the market. Since this is a very promising field and there is currently no high-quality review on this topic yet, this paper aims to review the key beamless processes and their latest developments.

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“…Besides, the current work also shows that the coating porosity level can be reduced with a small addition of He gas in the N 2 gas. The Ti64 coating sprayed with 20 vol.% addition of He gas to the N 2 gas successfully achieves a lower coating porosity in comparison with other reported works [22,42,[47][48][49]51,[76][77][78]. There are several reasons for the densification of the coatings: (1) the increase in particle velocity provides sufficient impact energy for the particles to deform and seal the pores, and (2) the increase in preheated temperature allows the particles to have more thermal softening.…”

Section: Particle Velocity Analysismentioning

confidence: 79%

Influence of Particle Velocity When Propelled Using N2 or N2-He Mixed Gas on the Properties of Cold-Sprayed Ti6Al4V Coatings

et al. 2018

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Cold-spraying is a relatively new low-temperature coating technology which produces coatings by the deposition of metallic micro-particles at supersonic speed onto target substrate surfaces. This technology has the potential to enhance or restore damaged parts made of light metal alloys, such as Ti6Al4V (Ti64). Particle deposition velocity is one of the most crucial parameters for achieving high-quality coatings because it is the main driving force for particle bonding and coating formation. In this work, studies were conducted on the evolution of the properties of cold-sprayed Ti64 coatings deposited on Ti64 substrates with particle velocities ranging from 730 to 855 m/s using pure N2 and N2-He mixture as the propellant gases. It was observed that the increase in particle velocity significantly reduced the porosity level from about 11 to 1.6% due to greater densification. The coatings’ hardness was also improved with increased particle velocity due to the intensified grain refinement within the particles. Interestingly, despite the significant differences in the coating porosities, all the coatings deposited within the velocity range (below and above critical velocity) achieved a high adhesion strength exceeding 60 MPa. The fractography also showed changes in the degree of dimple fractures on the particles across the deposition velocities. Finite element modelling was carried out to understand the deformation behaviour of the impacting particles and the evolutions of strain and temperature in the formed coatings during the spraying process. This work also showed that the N2-He gas mixture was a cost-effective propellant gas (up to 3-times cheaper than pure He) to deliver the high-quality Ti64 coatings.

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Microstructure and mechanical property of Ti and Ti6Al4V prepared by an in-situ shot peening assisted cold spraying

Cited by 161 publications

References 28 publications

Strengthened Peening Effect on Metallurgical Bonding Formation in Cold Spray Additive Manufacturing

Strengthened Peening Effect on Metallurgical Bonding Formation in Cold Spray Additive Manufacturing

Beamless Metal Additive Manufacturing

Influence of Particle Velocity When Propelled Using N2 or N2-He Mixed Gas on the Properties of Cold-Sprayed Ti6Al4V Coatings

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