Universität zu Köln

Schwanekamp, Tobias, Mueller, Andreas, Reuber, Martin, Gobran, Hany, Gdoura, Nabil and von Cetto, Sebastian (2022). Investigations on laser powder bed fusion of tungsten heavy alloys. Int. J. Refract. Met. Hard Mat., 109. OXFORD: ELSEVIER SCI LTD. ISSN 2213-3917

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Abstract

Laser powder bed fusion (L-PBF) offers significant potentialities for the design of complex part geometries. Due to the specific combination of properties, tungsten heavy alloys are used for special applications such as X-ray and gamma-radiation shielding, balancing weights, collimators and molds. For optimum performance, complex geometries can be required in those applications. L-PBF of tungsten heavy alloys such as W-Ni-Fe is challenging due to the high thermal conductivity, high viscosity of the liquid phase, the high melting point and sensitivity to thermal cracking. The effect of L-PBF processing parameters on the material microstructure is therefore studied for different W-Ni-Fe powders, applying substrate preheating temperatures up to 800 C. Furthermore, the impact of thermal post-treatment is investigated, leading to a microstructure close to conventionally sintered material. Crack-free samples can be generated from all powders, but residual and heterogeneously distributed pores are still detected. It is shown that evaporation of Ni-Fe binder matrix during L-PBF is significantly lower for pre -alloyed powders than for mixed powders.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schwanekamp, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Reuber, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Gobran, Hany UNSPECIFIED UNSPECIFIED UNSPECIFIED Gdoura, Nabil UNSPECIFIED UNSPECIFIED UNSPECIFIED von Cetto, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-663848
DOI:	10.1016/j.ijrmhm.2022.105959
Journal or Publication Title:	Int. J. Refract. Met. Hard Mat.
Volume:	109
Date:	2022
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	2213-3917
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PROCESSING PARAMETERS; MICROSTRUCTURE; DENSIFICATION Multiple languages Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/66384