Using a dual-laser system to create periodic coalescence in laser powder bed fusion

2020 ◽  
Vol 201 ◽  
pp. 14-22
Author(s):  
Wenxuan Zhang ◽  
Wenyuan Hou ◽  
Luc Deike ◽  
Craig B. Arnold
Procedia CIRP ◽  
2020 ◽  
Vol 94 ◽  
pp. 266-269 ◽  
Author(s):  
Jitka Metelkova ◽  
Daniel Ordnung ◽  
Yannis Kinds ◽  
Ann Witvrouw ◽  
Brecht Van Hooreweder

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4251
Author(s):  
Gregor Graf ◽  
Niki Nouri ◽  
Stefan Dietrich ◽  
Frederik Zanger ◽  
Volker Schulze

As part of an international research project (HiPTSLAM), the development and holistic processing of high-performance tool steels for AM is a promising topic regarding the acceptance of the laser powder bed fusion (PBF-LB) technology for functionally optimized die, forming and cutting tools. In a previous work, the newly developed maraging tool steel FeNiCoMoVTiAl was qualified to be processed by laser powder bed fusion (PBF-LB) with a material density of more than 99.9% using a suitable parameter set. To exploit further optimization potential, the influence of dual-laser processing strategies on the material structure and the resulting mechanical properties was investigated. After an initial calibration procedure, the build data were modified so that both lasers could be aligned to the same scanning track with a defined offset. A variation of the laser-based post-heating parameters enabled specific in-situ modifications of the thermal gradients compared to standard single-laser scanning strategies, leading to corresponding property changes in the produced material structure. An increase in microhardness of up to 15% was thus obtained from 411 HV up to 471 HV. The results of the investigation can be used to derive cross-material optimization potential to produce functionally graded high-performance components on PBF-LB systems with synchronized multi-laser technology.


Author(s):  
Jitka Metelkova ◽  
Lars Vanmunster ◽  
Han Haitjema ◽  
Daniel Ordnung ◽  
Jean-Pierre Kruth ◽  
...  

2021 ◽  
Vol 111 (07-08) ◽  
pp. 507-512
Author(s):  
Eckart Uhlmann ◽  
Alexander Mühlenweg

Die aktuelle Literatur zum Thema Laser Powder Bed Fusion (L-PBF) beschäftigt sich größtenteils mit Dauerstrich- (continuous-wave, cw) Laser-Anlagen, die kontinuierlich strahlend das Pulverbett scannen. Zusätzlich gibt es Anlagen mit gepulsten (quasi-continuous-wave, qcw) Lasern, die einen Puls bestimmter Dauer auf einen Punkt abgeben und dann zum nächsten Punkt springen. Die Parametersätze sind nicht ohne Weiteres zwischen den Anlagentypen übertragbar. Diese Arbeit behandelt die Parameterentwicklung für den Werkstoff Haynes 282 auf einer qcw-L-PBF-Anlage.   Current literature on Laser Powder Bed Fusion (L-PBF) mainly focuses on continuous-wave (cw) laser systems to scan the powder bed while continuously emitting laser light. Also, there are systems with pulsed (quasi-continuous-wave, qcw) lasers to scan one point in the powder bed for a set duration and then jump to the next point. The parameter sets for one system are not easy to transfer to a different type of laser system. This work describes the development of a parameter set for Haynes 282 on a system with a qcw laser.


Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 538 ◽  
Author(s):  
Fabrizia Caiazzo ◽  
Vittorio Alfieri ◽  
Giuseppe Casalino

Laser powder bed fusion (LPBF) can fabricate products with tailored mechanical and surface properties. In fact, surface texture, roughness, pore size, the resulting fractional density, and microhardness highly depend on the processing conditions, which are very difficult to deal with. Therefore, this paper aims at investigating the relevance of the volumetric energy density (VED) that is a concise index of some governing factors with a potential operational use. This paper proves the fact that the observed experimental variation in the surface roughness, number and size of pores, the fractional density, and Vickers hardness can be explained in terms of VED that can help the investigator in dealing with several process parameters at once.


2020 ◽  
Vol 106 (7-8) ◽  
pp. 3367-3379 ◽  
Author(s):  
Shahriar Imani Shahabad ◽  
Zhidong Zhang ◽  
Ali Keshavarzkermani ◽  
Usman Ali ◽  
Yahya Mahmoodkhani ◽  
...  

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