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Materials 2017, 10(3), 279; doi:10.3390/ma10030279

Laser Cladding of Ultra-Thin Nickel-Based Superalloy Sheets

1
Metals and Alloys, University Bayreuth, Ludwig-Thoma-Straße 36b, 95447 Bayreuth, Germany
2
Materials Engineering, University of Applied Sciences Hof, Alfons-Goppel-Platz 1, 95028 Hof, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Rui Vilar
Received: 12 December 2016 / Revised: 24 February 2017 / Accepted: 7 March 2017 / Published: 10 March 2017
(This article belongs to the Special Issue Laser Cladding)
View Full-Text   |   Download PDF [9613 KB, uploaded 10 March 2017]   |  

Abstract

Laser cladding is a well-established process to apply coatings on metals. However, on substrates considerably thinner than 1 mm it is only rarely described in the literature. In this work 200 µm thin sheets of nickel-based superalloy 718 are coated with a powder of a cobalt-based alloy, Co–28Cr–9W–1.5Si, by laser cladding. The process window is very narrow, therefore, a precisely controlled Yb fiber laser was used. To minimize the input of energy into the substrate, lines were deposited by setting single overlapping points. In a design of experiments (DoE) study, the process parameters of laser power, laser spot area, step size, exposure time, and solidification time were varied and optimized by examining the clad width, weld penetration, and alloying depth. The microstructure of the samples was investigated by optical microscope (OM) and scanning electron microscopy (SEM), combined with electron backscatter diffraction (EBSD) and energy dispersive X-ray spectroscopy (EDX). Similarly to laser cladding of thicker substrates, the laser power shows the highest influence on the resulting clad. With a higher laser power, the clad width and alloying depth increase, and with a larger laser spot area the weld penetration decreases. If the process parameters are controlled precisely, laser cladding of such thin sheets is manageable. View Full-Text
Keywords: laser cladding; selective coating; microstructural characterization; thin sheet material laser cladding; selective coating; microstructural characterization; thin sheet material
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gabriel, T.; Rommel, D.; Scherm, F.; Gorywoda, M.; Glatzel, U. Laser Cladding of Ultra-Thin Nickel-Based Superalloy Sheets. Materials 2017, 10, 279.

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