Evolution Of Microstructure And Properties In
Laser Cladding Of A Ni-Cr-B-Si Hardfacing Alloy
Author(s)
I. Hemmati, V. Ocelík & J. Th. M. De Hosson
Abstract
Ni-Cr-B-Si coatings are used in many industrial applications in order to improve
wear and/or corrosion properties. These coatings have traditionally been
deposited by thermal spray techniques but the laser cladding process is also
being increasingly employed to produce Ni-Cr-B-Si coatings with superior
functional properties. In this research, the microstructural evolutions and the
phase formations in the laser cladding of a Ni-Cr-B-Si alloy and their effects on
the hardness of the clad layer are discussed. Results of this study show various
types of boride and carbide phases can form in each track of the clad layer. These
changes demonstrate the potential for tuning the properties of these coating by
controlling the processing conditions.
Keywords: Ni-Cr-B-Si, laser cladding, microstructural evolution.
1 Introduction
Significant development of high power lasers has encouraged the commercial
application of laser-assisted surface modification technologies. Laser cladding is
one of these technologies in which an alloy powder of a desired composition and
a thin layer of a substrate material are melted under laser irradiation and then
rapidly solidified to form a dense coating with minimum dilution and
metallurgical bond to the base material The rapid solidification associated with
laser cladding is able to generate novel microstructures with extended
solubilities, metastable phases and refined features [1–3].
The Ni-Cr-B-Si alloys are boride-containing Nickel base hardfacing alloys with
excellent wear and corrosion resistance in chemically-aggressive environments and
high temperature working conditions [4–6]. These alloys have traditionally been
Keywords
Ni-Cr-B-Si, laser cladding, microstructural evolution
Related Book
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