Influence of metal powder cross-contaminations on part quality in Laser Powder Bed Fusion: copper alloy particles in maraging steel feedstock

Maraging steel is an engineering alloy which has been widely employed in metal additive manufacturing. This paper examines manufacturing and post-processing factors affecting the properties of maraging steel fabricated via laser powder bed fusion (L-PBF). It covers the review of published research findings on how powder quality feedstock, processing parameters, laser scan strategy, build orientation and heat treatment can influence the microstructure, density and porosity, defects and residual stresses developed on L-PBF maraging steel, with a focus on the maraging steel 300 alloy. This review offers an evaluation of the resulting mechanical properties of the as-built and heat-treated maraging steel 300, with a focus on anisotropic characteristics. Possible directions for further research are also identified.

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Single-track investigation of IN738LC superalloy fabricated by laser powder bed fusion: Track morphology, bead characteristics and part quality

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2020.117000 ◽

2021 ◽

Vol 290 ◽

pp. 117000

Author(s):

Chuan Guo ◽

Zhen Xu ◽

Yang Zhou ◽

Shi Shi ◽

Gan Li ◽

...

Keyword(s):

Powder Bed Fusion ◽

Single Track ◽

Laser Powder Bed Fusion ◽

Powder Bed ◽

Part Quality

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Microstructure of Built Part Obtained by Powder Bed Fusion Process with Metal

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.825.1 ◽

2019 ◽

Vol 825 ◽

pp. 1-6

Author(s):

Tatsuaki Furumoto ◽

Kyota Egashira ◽

Souta Matsuura ◽

Makoto Nikawa ◽

Masato Okada ◽

...

Keyword(s):

Heat Treatment ◽

Metal Powder ◽

Maraging Steel ◽

Process Parameters ◽

Steel Powder ◽

Powder Bed Fusion ◽

Laser Melting ◽

Powder Bed ◽

Suitable Heat Treatment ◽

Deposited Metal

The influence of various process parameters on the building of maraging steel powder by the selective laser melting (SLM) processes is investigated. The microstructure in the built part was observed and the influence of the heat treatment was evaluated. As results, the depth of solidified layer was higher than that of deposited metal powder, and its value was influenced with the process parameters. The microstructure in the boundary between the built part and the substrate was quite different from the built part even if the suitable heat treatment was performed.

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Material Reuse in Laser Powder Bed Fusion: Side Effects of the Laser—Metal Powder Interaction

Metals ◽

10.3390/met10030341 ◽

2020 ◽

Vol 10 (3) ◽

pp. 341 ◽

Cited By ~ 5

Author(s):

Eleonora Santecchia ◽

Stefano Spigarelli ◽

Marcello Cabibbo

Keyword(s):

Additive Manufacturing ◽

Side Effects ◽

Metal Powder ◽

Three Dimensional ◽

High Energy ◽

Powder Bed Fusion ◽

Laser Powder Bed Fusion ◽

Powder Bed ◽

Metal Additive Manufacturing ◽

Metal Additive

Metal additive manufacturing is changing the way in which engineers and designers model the production of three-dimensional (3D) objects, with rapid growth seen in recent years. Laser powder bed fusion (LPBF) is the most used metal additive manufacturing technique, and it is based on the efficient interaction between a high-energy laser and a metal powder feedstock. To make LPBF more cost-efficient and environmentally friendly, it is of paramount importance to recycle (reuse) the unfused powder from a build job. However, since the laser–powder interaction involves complex physics phenomena and generates by-products which might affect the integrity of the feedstock and the final build part, a better understanding of the overall process should be attained. The present review paper is focused on the clarification of the interaction between laser and metal powder, with a strong focus on its side effects.

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