Overview of Laser Absorptivity Measurement Techniques for Material Processing

Indhu, R; Vivek, V.; Sarathkumar, L.; Bharatish, A.; Santhanakrishnan, Soundarapandian

doi:10.1007/s40516-018-0075-1

Cited by 72 publications

(36 citation statements)

References 42 publications

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“…Therefore, the surface topography and resulting S a roughness varied with the chemical composition of the powder, as shown in Figure 4 . The laser beam reflectivity and absorption with the powder mixture and surface varied depending on the powder chemical composition [ 41 , 42 , 43 ]. This included a large difference in the melting temperature, where the NiCrBSi had a liquidus point at 1180 °C, and the WC had a melting temperature of 2850 °C.…”

Section: Resultsmentioning

confidence: 99%

Tribological Properties of Solid Solution Strengthened Laser Cladded NiCrBSi/WC-12Co Metal Matrix Composite Coatings

et al. 2022

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NiCrBSi, WC-12Co and NiCrBSi with 30, 40 and 50 wt.% WC-12Co coatings were produced on low carbon steel by laser cladding with an Nd:YAG laser with a multi-jet coaxial cladding-nozzle. The microstructure properties after WC-12Co alloying were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and Vickers hardness tests. The resulting microstructures consisted of a γ-Ni and Ni3B matrix, strengthened with Co and W, Ni3Si, CrB, Cr7C3, Cr23C6, WC/W2C phases. In coatings with 30, 40 and 50 wt.% WC-12Co, a solid solution, strengthened multi-matrix NiCrWCo phase formed, which yielded a higher matrix hardness. Wear tests that monitored the friction coefficients were performed with a tribometer that contained a ball-on-disc configuration, Al2O3 counter-body and reciprocal sliding mode at room temperature. The major wear mode on the NiCrBSi coatings without the WC-12Co was adhesive with a high wear rate and visible material loss by flaking, delamination and micro-ploughing. The addition of WC-12Co to the NiCrBSi coating significantly increased the wear resistance and changed the major wear mechanism from adhesion to three-body abrasion and fatigue wear.

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Section: Resultsmentioning

confidence: 99%

Tribological Properties of Solid Solution Strengthened Laser Cladded NiCrBSi/WC-12Co Metal Matrix Composite Coatings

et al. 2022

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“…Blue light lasers (wavelength ~ 450 nm) have now been developed [19] and much higher energy absorption on highly reflective surfaces. The variation of absorptivity with wavelength for various metals was reported within the literature [20,21]. For example, the absorptivity values at blue wavelength are around 13, 3, 1.5, and 1.3 times higher than at IR wavelength for copper, aluminium, nickel, and steel, respectively [22][23][24].…”

Section: Industrial Requirementsmentioning

confidence: 96%

Blue laser welding of multi-layered AISI 316L stainless steel micro-foils

Das

Fritz²,

Finuf³

et al. 2020

Optics & Laser Technology

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“…Experimental methods specifically designed for measuring laser absorptance, along with modeling efforts, are required to provide more insight on the beam–powder interaction. These methods can be divided into two groups [ 72 ]: The calorimetry method, which directly measures the absorptance from the temperature variations developed across a thin sample irradiated on the top surface; The radiometric method, which indirectly determines absorptance through the analysis of optical radiative properties such as reflectance and emissivity. …”

Section: Selective Laser Sintering Processmentioning

confidence: 99%

Process Phenomena and Material Properties in Selective Laser Sintering of Polymers: A Review

et al. 2021

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Selective laser sintering (SLS) is a powder bed fusion technology that uses a laser source to melt selected regions of a polymer powder bed based on 3D model data. Components with complex geometry are then obtained using a layer-by-layer strategy. This additive manufacturing technology is a very complex process in which various multiphysical phenomena and different mechanisms occur and greatly influence both the quality and performance of printed parts. This review describes the physical phenomena involved in the SLS process such as powder spreading, the interaction between laser beam and powder bed, polymer melting, coalescence of fused powder and its densification, and polymer crystallization. Moreover, the main characterization approaches that can be useful to investigate the starting material properties are reported and discussed.

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Overview of Laser Absorptivity Measurement Techniques for Material Processing

Cited by 72 publications

References 42 publications

Tribological Properties of Solid Solution Strengthened Laser Cladded NiCrBSi/WC-12Co Metal Matrix Composite Coatings

Tribological Properties of Solid Solution Strengthened Laser Cladded NiCrBSi/WC-12Co Metal Matrix Composite Coatings

Blue laser welding of multi-layered AISI 316L stainless steel micro-foils

Process Phenomena and Material Properties in Selective Laser Sintering of Polymers: A Review

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