Laser deposition additive manufacturing of 17-4PH stainless steel on Ti-6Al-4V using V interlayer

Adomako, Nana Kwabena; Noh, Seong Jin; Oh, Chang Woo; Yang, Sangsun; Kim, Jeoung Han

doi:10.1080/21663831.2019.1596989

Cited by 35 publications

(7 citation statements)

References 18 publications

(18 reference statements)

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“…It can be seen from the figure that the black spots are composed of all elements from the alloy coating and substrate, including Co, Cr, Ni, Mo, Fe, and C. This may indicate that the spots are formed by incomplete melting and rapid solidification during the coating process. A study by Adomako et al [25] found that the higher the scanning speed, the shorter the laser heating/melting time, resulting in an incomplete melting of the powder, which coupled with rapid solidification and resulted in the formation of pores, in consistency with our conclusion.…”

Section: Morphologiesof the Composites Coatingssupporting

confidence: 92%

Microstructure and Wear Behavior of Laser Cladded CoCrNiMox Coatings on the Low Carbon Steel

et al. 2022

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In this study, CoCrNiMox (x = 0, 1, 3 and 5, wt.%) alloy coatings were fabricated on the surface of low carbon steel by laser surface cladding. The scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD) were used to analyze the microstructure and phases of the prepared coatings. The microhardness and wear resistance of these coating were also evaluated. The results showeded that a single-phase face-centered cubic (FCC) structure generated by the CoCrNi ternary compound in all the coatings, the σ phase, and the Mu (μ) phase, enriched with Cr and Mo and originated with additional Mo, exhibited a lamellar structure. The content of FCC single-phase structure in the coating gradually decreases with the increasing of Mo because the addition of Mo can promote the precipitation of the σ phase and the μ phase. Among all the laser cladded coatings, the CoCrNiMo5 alloy coating shows the best properties, owing to the higher proportion of intermetallic compounds in the σ phase and the μ phase, which can provide enhanced performance. This exhibited the narrowest wear scar width and showed the fatigue wear mechanism.

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Section: Morphologiesof the Composites Coatingssupporting

confidence: 92%

Microstructure and Wear Behavior of Laser Cladded CoCrNiMox Coatings on the Low Carbon Steel

et al. 2022

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“…These could neither be referred to as pores nor as (Fe,Cr) 23 C 6 carbides associated with sensitization [ 40 ]. Intermetallic sigma (σ) phases [ 41 , 42 ], massive transformation [ 43 ], and δ-ferrite can be ruled out too either from compositional or shape considerations. Hence, we believe that the zones described in (b) result from local chemical inhomogeneity during the deposition process.…”

Section: Resultsmentioning

confidence: 99%

Comparative Quality Control of Titanium Alloy Ti–6Al–4V, 17–4 PH Stainless Steel, and Aluminum Alloy 4047 Either Manufactured or Repaired by Laser Engineered Net Shaping (LENS)

et al. 2020

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Additive manufacturing attracts much interest for manufacturing and repair of structural parts for the aerospace industry. This paper presents comparative characterization of aircraft items made of Al 4047 alloy, Ti-6Al-4V alloy, and 17-4 precipitation hardened (PH) (AISI 630) stainless steel, either manufactured or repaired by laser engineered net shaping (LENS). Chemical analysis, density, and surface roughness measurements, X-ray micro-computed tomography (μ-CT) analysis, metallography, and micro-hardness testing were conducted. In all three materials, microstructures typical of rapid solidification were observed, along with high density, chemical composition, and hardness comparable to those of the counterpart wrought alloys (even in hard condition). High standard deviation in hardness values, anisotropic geometrical distortion, and overbuild at top edges were observed. The detected defects included partially melted and unmelted powder particles, porosity, and interlayer lack of fusion, in particular at the interface between the substrate plate and the build. There was a fairly good match between the density values measured by μ-CT and those measured by the Archimedes method; there was also good correlation between the type of defects detected by both techniques. Surface roughness, density of partially melted powder particles, and the content of bulk defects were significantly higher in Al 4047 than in 17-4 PH stainless steel and Ti-6Al-4V alloy. Optical gaging can be used reliably for surface roughness measurements. The implications of these findings are discussed.

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“…Type of intermetallic phases that formed in AM joints were similar to those that formed in solid-state weldments [142]. Compositionally gradient Ti-6Al-4 V/Ti-V/304L SS [143] and Ti-6Al-4 V/Ti-V/17-4 PH SS [144] AM joints had marginally higher bond strength than direct deposits whereas through a new graded composition route, Ti-6Al-4 V/V/Cr/Fe/316 SS, brittle intermtallics are reported to be successfully eliminated [145,146].…”

Section: Solid-state Welding Of Fe/ti Alloysmentioning

confidence: 99%

An overview on the microstructure and properties of Fe/Ti based dissimilar joints

Prasanthi

Sudha

Saroja

2023

Materials Science and Technology

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Joining of Ti and Fe-based alloys is challenging due to the formation of deleterious phases at the interface. Since fusion welding is unsuitable for the purpose, over the years, many solid-state welding techniques have been tried. This review provides a comparison of different solid-state joining methods used for Fe/Ti alloys with focus on the structural transformations in base materials, effect of process parameters on interface microstructure, its evolution and kinetics with thermal aging and structure–property correlation. Structural transformations in diffusion couples (near-equilibrium condition) are compared with those in weldments and a perspective is provided on the role of defects and alloying additions in enhancing/retarding reaction zone formation under both equilibrium and non-equilibrium conditions.

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Laser deposition additive manufacturing of 17-4PH stainless steel on Ti-6Al-4V using V interlayer

Cited by 35 publications

References 18 publications

Microstructure and Wear Behavior of Laser Cladded CoCrNiMox Coatings on the Low Carbon Steel

Microstructure and Wear Behavior of Laser Cladded CoCrNiMox Coatings on the Low Carbon Steel

Comparative Quality Control of Titanium Alloy Ti–6Al–4V, 17–4 PH Stainless Steel, and Aluminum Alloy 4047 Either Manufactured or Repaired by Laser Engineered Net Shaping (LENS)

An overview on the microstructure and properties of Fe/Ti based dissimilar joints

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