Residual Stresses In Co-based Laser
Claddings Investigated By Lab X-rays And
Synchrotron Diffraction Techniques
Author(s)
U. O. B de Oliveira, V. Ocelik & J. Th. M. De Hosson
Abstract
It is a well known fact that cracking related problems may occur during the laser
cladding deposition process. In particular for the improvement of thick coatings
it is of prime interest to know how processing parameters affect the residual
stress state. The residual strains developed in Co-based thick clad layers were
investigated by laboratory Cu-Kα and Synchrotron X-rays. On the surface the
strain tensor is determined by the Sin2Ψ technique. Strain mapping performed by
synchrotron radiation shows that tensile stresses dominate the upper region but
may change into compressive towards the inner part of the coating. The effect of
laser overlap is discussed and a mechanism for stress concentration is proposed.
Keywords: laser cladding, residual stress, X-rays, synchrotron.
1 Introduction
The laser cladding technique by powder injection is an attractive methodology
that allows the deposition of thick protective metallic coatings on weaker
substrates [1,2]. The process consists of producing a protective layer on the
surface of the substrate using a high power laser beam as a heat source while a
carrier gas is used to form a cladding powder stream blown under the laser beam.
The substrate is scanned by the laser beam creating a melt pool with a depth that
corresponds to the thickness of a single clad generated in one step.
High thermal gradients involved in the process are responsible for the
generation of residual stresses, often of harmful tensile nature [3]. During
Keywords
laser cladding, residual stress, X-rays, synchrotron.
Related Book
Other papers in this volume
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