Universität zu Köln

Schwanekamp, Tobias, Marginean, Gabriela and Reuber, Martin (2019). Laser beam melting of Cr3C2-NiCr. Int. J. Refract. Met. Hard Mat., 85. OXFORD: ELSEVIER SCI LTD. ISSN 0263-4368

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Abstract

Due to the high temperature wear resistance, low friction coefficient and corrosion resistance, chromium carbides are widely used for coating applications and commonly processed through thermal spraying. In contrast to classical processing, additive manufacturing technologies such as Laser Beam Melting (LBM) offer significant geometrical flexibility in design. Relying on the use of this advantage for manufacturing innovative products, the present study focuses on the qualification of Cr3C2-NiCr for the LBM process. Experiments are carried out with composite thermal spray powder through variation of the main LBM process parameters and pre-heating temperatures up to 800 degrees C. Specimens are generated and evaluated with respect to material microstructure and mechanical properties. The results indicate that pre-heating can significantly improve the material quality. It prevents thermal cracking and substantially reduces porosity, in particular for low laser energy inputs. An impact of the LBM process parameters and pre-heating on the balance between the binder and the carbide phase is detected only for high laser energy inputs above 1000 J/mm(3). Measurements of the micro-hardness of the laser molten material indicate a hardness close to the specifications of thermally sprayed material. A maximum transverse rupture strength around 600 MPa is achieved for specimens generated with pre-heating and medium laser energy inputs. For high laser energy inputs, secondary carbide and graphite phases occur inside the material microstructure.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schwanekamp, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Marginean, Gabriela UNSPECIFIED UNSPECIFIED UNSPECIFIED Reuber, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-126769
DOI:	10.1016/j.ijrmhm.2019.105069
Journal or Publication Title:	Int. J. Refract. Met. Hard Mat.
Volume:	85
Date:	2019
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	0263-4368
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WEAR BEHAVIOR Multiple languages Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12676