A4 Conference proceedings

First investigation on processing parameters for laser powder bed fusion of Ni-Mn-Ga magnetic shape memory alloy


Publication Details
Authors: Laitinen Ville, Salminen Antti, Ullakko Kari
Publisher: Laser Institute of America
Publication year: 2019
Language: English
Related Journal or Series Information: Journal of Laser Applications
Title of parent publication: 2018 ICALEO Conference Proceedings
Volume number: 31
Issue number: 2
ISBN: 978-1-940168-1-42
ISSN: 1042-346X
eISSN: 1938-1387
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication

Abstract


The Ni-Mn-Ga alloy develops strains of several percent
in an applied magnetic field. These materials have potential as high-speed
actuators, valves, pumps, robots, and micro-grippers. Laser powder bed fusion
(LPBF) of Ni-Mn-Ga was investigated in order to establish a preliminary
processing window and to understand the effects of processing parameters on
end-product composition. In the future, LPBF could enable production of
functional near net shape Ni-Mn-Ga components on an industrial scale.



A series of experiments was conducted for pre-alloyed
Ni-Mn-Ga powder using an LPBF setup developed in‑house. Two different substrate
materials, stainless steel 316L and Incoloy 825, were used in the experiments.
The single track experiments show that tracks deposited on Incoloy substrates,
in comparison to tracks deposited on stainless steel substrates, are wider and
have shallower penetration into the substrate. In addition, the tracks
deposited on the Incoloy substrates are more likely to exhibit irregular and
balling morphologies. The results of the single track and hatching distance
experiments were used to manufacture Ni-Mn-Ga cuboids on an Incoloy substrate. Analysis
of the cuboid compositions revealed that LPBF of Ni-Mn-Ga dilutes manganese and
gallium. The relative amounts of vaporized manganese and gallium increased as
the value of volumetric energy density (VED) was increased.


Last updated on 2019-11-10 at 13:37