Production of metal–ceramic lattice structures by selective laser melting and carburizing or nitriding

Holovenko, Yaroslav; Kollo, Lauri; Jõeleht, Marek; Ivanov, Roman; Soloviova, Tetiana; Veinthal, Renno

doi:10.3176/proc.2019.2.02

Cited by 8 publications

(2 citation statements)

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“…Postprocessing (nitriding or carburizing) can provide the increase in the Vickers hardness of metallic lattice structures up to 3 times [23]. Surface patterns of solid metallic structures have a significant role in controlling the friction coefficient [24].…”

Section: Results Of Laboratorymentioning

confidence: 99%

Selective Laser Melting of Diamond-Containing or Postnitrided Materials Intended for Impact-Abrasive Conditions: Experimental and Analytical Study

Rahmani

Antonov

Kollo

2019

Advances in Materials Science and Engineering

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Materials with higher wear resistance are required in various applications including cutting elements (drag bits) of soft ground tunnel boring machines (TBM) to increase the productivity and to reduce the risk for workers involved in exchange operations (dangerous hyperbolic conditions). In recent work, two types of materials were produced by combining 3D printing (selective laser melting, SLM) of cellular lattice structures and spark plasma sintering (SPS) methods. The lattices were printed from (1) 316L stainless steel with diamond and (2) Ti6Al4V with nitriding. The effect of diamond content (5%, 10%, and 20%; nickel-coated particles) and unit cell size on performance was studied. The titanium alloy lattice was nitrided to increase its hardness and wear resistance. The effect of nitriding temperature (750°C, 900°C, and 1050°C) and lattice volume fraction (6%, 15%, and 24%, vol.) was investigated, and the optimized conditions were applied. The lattices were filled with 316L and Ti6Al4V powders, respectively, and consolidated by SPS. Samples were tested with the help of laboratory impact-abrasive tribodevice. Laboratory results have shown that both reinforcing approaches are beneficial and allow improvement of wear resistance in impact-abrasive conditions with great potential for TBM or similar applications. Modelling with the help of finite element method has shown that lattice structure enables reduction of peak local stresses in scratching and impact conditions.

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Section: Results Of Laboratorymentioning

confidence: 99%

Selective Laser Melting of Diamond-Containing or Postnitrided Materials Intended for Impact-Abrasive Conditions: Experimental and Analytical Study

Rahmani

Antonov

Kollo

2019

Advances in Materials Science and Engineering

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“…The SLM process is performed in nitrogen protective atmosphere keeping oxygen level less than 0.2 %. Porous stacks can be obtain directly by SLM or by using undirect methods [14] in order to improve material properties [15].…”

Section: Slm Processmentioning

confidence: 99%

Use of Selective Laser Melting for Manufacturing the Porous Stack of a Thermoacoustic Engine

Auriemma

Holovenko

2019

KEM

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In this study the authors investigate the possibility of using Selective Laser Melting (SLM) to manufacture the porous element (stack) of a thermoacoustic engine. Two stacks, provided with different internal geometries but with the same hydraulic radii, have been produced: one with parallel plates and one with a new, oblique pin array configuration. The pin array stacks provide smaller amount of viscous losses during the thermal to acoustic power conversion when working fluids with Pr < 1, e.g. air. Furthermore, the oblique configuration is designed to reduce the heat transmission from the hot to the cold surface of the stack, thus to achieve more easily the temperature gradient for the onset of the thermoacoustic phenomenon. In general, the pin array configurations are difficult to manufacture with conventional technologies. However, the SLM provides precise control of the features of the printed object, thus allowing to objectively compare the behavior of the two stacks. To this aim, the temperature gradient between the hot and cold faces of the stacks and the corresponding sound pressure levels measured at 15 cm from the open end of the engine are measured and compared.

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Effect of lattice surface treatment on performance of hardmetal - titanium interpenetrating phase composites

Holovenko

Kollo

Saarna

et al. 2020

International Journal of Refractory Metals and Hard Materials

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Production of metal–ceramic lattice structures by selective laser melting and carburizing or nitriding

Cited by 8 publications

References 0 publications

Selective Laser Melting of Diamond-Containing or Postnitrided Materials Intended for Impact-Abrasive Conditions: Experimental and Analytical Study

Selective Laser Melting of Diamond-Containing or Postnitrided Materials Intended for Impact-Abrasive Conditions: Experimental and Analytical Study

Use of Selective Laser Melting for Manufacturing the Porous Stack of a Thermoacoustic Engine

Effect of lattice surface treatment on performance of hardmetal - titanium interpenetrating phase composites

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