Effect of the regimes of selective laser melting on the structure and physicomechanical properties of cobalt-base superalloys

Tarasova, Tatiana; Назаров, А. П.; Prokof’ev, M. V.

doi:10.1134/s0031918x15060101

Cited by 20 publications

(10 citation statements)

References 8 publications

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“…The results obtained in the second process gap (Figure 8d-f) give a more acceptable picture of the formation, with higher values of the SLM factors. The tracks were consistent and regular, which may be sufficient and satisfactory for the creation of solid metallurgical contact with the previous layers [83][84][85].…”

Section: Formation Of Single Tracks and Its Characterizationmentioning

confidence: 74%

“…If we take as a criterion for stable track formation the ratio of depth to width of the track as 1:5, based on practical experience of working with SLM technology [18,83], it can be seen that the donut profile probably has the best prospects for further research (with laser power up to 1 kW and scanning speed up to 0.5 m/s). It shows high proportional stability at a laser power more than 130 W and scanning speed of more than 0.05 m/s.…”

Section: Influence Of Laser Density Distribution On Geometry Of the Tmentioning

confidence: 99%

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Power Density Distribution for Laser Additive Manufacturing (SLM): Potential, Fundamentals and Advanced Applications

et al. 2018

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Problems with the laser additive manufacturing of metal parts related to its low efficiency are known to hamper its development and application. The method of selective laser melting of metallic powders can be improved by the installation of an additional laser beam modulator. This allows one to control the power density distribution optically in the laser beam, which can influence the character of heat and mass transfer in a molten pool during processing. The modulator contributes alternative modes of laser beam: Gaussian, flat top (top hat), and donut (bagel). The study of its influence includes a mathematical description and theoretical characterization of the modes, high-speed video monitoring and optical diagnostics, characterization of processing and the physical phenomena of selective laser melting, geometric characterization of single tracks, optical microscopy, and a discussion of the obtained dependences of the main selective laser melting (SLM) parameters and the field of its optimization. The single tracks were produced using the advanced technique of porosity lowering. The parameters of the obtained samples are presented in the form of 3D graphs. The further outlook and advanced applications are discussed.

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Section: Formation Of Single Tracks and Its Characterizationmentioning

confidence: 74%

Section: Influence Of Laser Density Distribution On Geometry Of the Tmentioning

confidence: 99%

Power Density Distribution for Laser Additive Manufacturing (SLM): Potential, Fundamentals and Advanced Applications

et al. 2018

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“… Selected values of fracture elongation verse ultimate tensile stress of various alloys from existing literature on metal AM [ 118 , 119 , 120 , 121 , 122 , 123 , 124 , 125 , 126 , 138 , 139 , 140 , 141 , 142 , 143 , 144 , 145 , 146 , 147 , 148 , 149 , 150 , 151 , 152 , 153 , 154 , 155 , 156 , 157 , 158 , 159 , 160 , 161 , 162 ]. …”

Section: Figurementioning

confidence: 99%

“…( C ) Selected values of the yield stress of nickel-based alloys from existing literature on metal AM [ 83 , 128 , 139 , 147 , 156 , 157 , 158 , 159 , 164 ]. ( D ) Selected values of the yield stress of other alloys besides aluminum-based, nickel-based, or Ti6Al4V alloys from existing literature on metal AM [ 138 , 146 , 148 , 149 , 150 , 151 , 152 , 153 , 154 , 165 , 166 , 167 , 168 ]. The bolded pattern indicates a heat-treated sample.…”

Section: Figurementioning

confidence: 99%

A Review of Diagnostics Methodologies for Metal Additive Manufacturing Processes and Products

et al. 2021

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Additive manufacturing technologies based on metal are evolving into an essential advanced manufacturing tool for constructing prototypes and parts that can lead to complex structures, dissimilar metal-based structures that cannot be constructed using conventional metallurgical techniques. Unlike traditional manufacturing processes, the metal AM processes are unreliable due to variable process parameters and a lack of conventionally acceptable evaluation methods. A thorough understanding of various diagnostic techniques is essential to improve the quality of additively manufactured products and provide reliable feedback on the manufacturing processes for improving the quality of the products. This review summarizes and discusses various ex-situ inspections and in-situ monitoring methods, including electron-based methods, thermal methods, acoustic methods, laser breakdown, and mechanical methods, for metal additive manufacturing.

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“…As well as other methods of the additive manufacturing [3] SLM can involve the use of a wide range of metallic materials and produce parts for aerospace and medical applications [4]. A high cooling rate typical of this process often ensures obtaining materials with submicron and nanocrystalline grain structure, having increased strength and wear resistance [5,6]. In fact, SLM is not limited by geometric form complexity and refractoriness of material [7].…”

Section: Introductionmentioning

confidence: 99%

Phase composition and microstructure of WC–Co alloys obtained by selective laser melting

Khmyrov

Shevchukov

Gusarov

et al. 2017

Mechanics & Industry

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Abstract. Phase composition and microstructure of initial WC, BK8 (powder alloy 92 wt.% WC-8 wt.% Co), Co powders, ball-milled powders with four different compositions (1) 25 wt.% WC-75 wt.% Co, (2) 30 wt.% BK8-70 wt.% Co, (3) 50 wt.% WC-50 wt.% Co, (4) 94 wt.% WC-6 wt.% Co, and bulk alloys obtained by selective laser melting (SLM) from as-milled powders in as-melted state and after heat treatment were investigated by scanning electron microscopy and X-ray diffraction analysis. Initial and ball-milled powders consist of WC, hexagonal a-Co and face-centered cubic b-Co. The SLM leads to the formation of major new phases W 3 Co 3 C, W 4 Co 2 C and face-centered cubic b-Co-based solid solution. During the heat treatment, there occurs partial decomposition of the face-centered cubic b-Co-based solid solution with the formation of W 2 C and hexagonal a-Co solid solution. The microstructure of obtained bulk samples, in general, corresponds to the observed phase composition.

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Effect of the regimes of selective laser melting on the structure and physicomechanical properties of cobalt-base superalloys

Cited by 20 publications

References 8 publications

Power Density Distribution for Laser Additive Manufacturing (SLM): Potential, Fundamentals and Advanced Applications

Power Density Distribution for Laser Additive Manufacturing (SLM): Potential, Fundamentals and Advanced Applications

A Review of Diagnostics Methodologies for Metal Additive Manufacturing Processes and Products

Phase composition and microstructure of WC–Co alloys obtained by selective laser melting

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