Interfacial phenomena and characteristics between the deposited material and substrate in selective laser melting Inconel 625

Li, C.; Guo, Y. B.; Zhao, Jun-Ren

doi:10.1016/j.jmatprotec.2016.12.033

Cited by 84 publications

(28 citation statements)

References 27 publications

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“…Similar to the grain growth behavior in most LPBF alloys, as-built IN625 consists of some cellular dendrites and columnar grains with elongated grains in the building direction (see Figure 4) [49]. To be more specific, LPBF IN625 alloy has a typical gamma face-centered cubic (γ-FCC) matrix and a strong texture with <100> orientations parallel to the Z-axis direction [55].…”

Section: Microstructure In As-built Statementioning

confidence: 82%

“…The process parameters of the LPBF, as well as the powder factor, will have a significant impact on the microstructure of the formed part. Li et al [49] conducted a single track LPBF of IN625 experiment and found that the effect of laser power on the spacing of primary cells is greater than the effect from scanning speed. With the increase of laser power and the decrease of scanning speed, The process parameters of the LPBF, as well as the powder factor, will have a significant impact on the microstructure of the formed part.…”

Section: Microstructure In As-built Statementioning

confidence: 99%

“…There are many variables associated with the LPBF process, such as laser power, scan speed, hatch spacing, and layer thickness. All of these variables need to be properly manipulated to successfully and reliably generate the final component, otherwise, it will result in balling, distortion, porosity, cracks, and low-density defects that seriously affect the performance of the parts [49][50][51][52][53]. For example, when using low laser power or high scanning speed, the molten pool is not wide enough or heated enough to combine the present track with the surrounding materials, resulting in the lack of fusion of parts [53].…”

Section: Introductionmentioning

confidence: 99%

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A Review on Laser Powder Bed Fusion of Inconel 625 Nickel-Based Alloy

et al. 2019

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The Inconel 625 (IN625) superalloy has a high strength, excellent fatigue, and creep resistance under high-temperature and high-pressure conditions, and is one of the critical materials used for manufacturing high-temperature bearing parts of aeroengines. However, the poor workability of IN625 alloy prevents IN625 superalloy to be used in wider applications, especially in applications requiring high geometrical complexity. Laser powder bed fusion (LPBF) is a powerful additive manufacturing process which can produce metal parts with high geometrical complexity and freedom. This paper reviews the studies that have been done on LPBF of IN625 focusing on the microstructure, mechanical properties, the development of residual stresses, and the mechanism of defect formation. Mechanical properties such as microhardness, tensile properties, and fatigue properties reported by different researchers are systematically summarized and analyzed. Finally, the remaining issues and suggestions on future research on LPBF of IN625 alloy parts are put forward.

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Section: Microstructure In As-built Statementioning

confidence: 82%

Section: Microstructure In As-built Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Review on Laser Powder Bed Fusion of Inconel 625 Nickel-Based Alloy

et al. 2019

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“…The increase of temperature subsequently led to the reduction of both viscosity and surface tension of the melt [42]. As a result, wetting of the substrate was enhanced, manifested by the decrease of contact angle [15,43].…”

Section: Discussionmentioning

confidence: 99%

“…In addition, rapid cooling and high thermal gradient associated with single track formation often result in unique heterogeneous microstructure hence anisotropic and varied mechanical properties within the solidified track [15,16]. However, till now indepth understanding of the relationship between process conditions and microstructural evolution of ceramic materials processed using SLM is lacking.…”

Section: Introductionmentioning

confidence: 99%

Selective laser melting of alumina: A single track study

Fan

Huang

2018

Ceramics International

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Ceramics-based additive manufacturing is a complex process and the solidification mechanism and microstructural evolution are currently not fully understood. In this work, Al 2 O 3 single tracks were formed using a customised selective laser melting (SLM) system equipped with a high power diode laser. The effects of laser energy density (LED) on geometry, microstructure and micro-mechanical properties of Al 2 O 3 tracks were investigated. To better understand the solidification mechanism, a transient threedimensional thermal model was developed for predicting the thermal behaviour of the melt pool. The results indicated the use of high LED gave rise to decreased viscosity and surface tension of the molten alumina and led to localised melting of the substrate. Both, in turn, enabled the formation of a continuous solidified track. The solidified tracks were primarily composed of columnar dendrite. When relatively high LED (≥25.7 kJ/m) was applied, equiaxed dendrite appeared along the central line near the 2 track surface. The size of dendritic grains decreased with the decreased LED, attributed to the increased cooling rate at solidification interface. The micro-hardness of the solidified track was found to be inversely proportional to the grain size owning to grain boundary strengthening effect.

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