Evaluation Of Residual Stresses In Laser Clad
Coating At The Micrometer Scale
Author(s)
I. Furár, V. Ocelík & J. Th. M. De Hosson
Abstract
Residual stresses may have beneficial or detrimental effects to the materials
properties and therefore precise knowledge and control of residual stresses are of
high practical relevance. For the stress-relaxation measurement at a micro level
we explored the slit milling (crack compliance) method using Focused Ion Beam
(FIB) to release local strain induced by internal stresses and Digital Image
Correlation (DIC) of SEM images taken before and after stress release to register
it. The method allows us to measure stress components through the entire area of
laser clad coating as a function of laser clad depth. We used: (i) 3.3 kW IPG fiber
laser for cladding of tool steel, (ii) LYRA Tescan dual beam system with
Focused Ion Beam and Electron Beam guns like milling-imaging instrument,
respectively, (iii) Aramis GOM GmbH Digital Image Correlation for surface
displacements registration. Finally, reducing the noise by using the appropriate
magnification, facets size, resolution and by applying of integration method
during collecting of SEM images we were able to increase sensitivity for lowest
detectable displacement (~ 1nm).
Keywords: residual stress, focus Ion beam, laser clad coating, digital image
correlation.
1 Introduction
Laser cladding is an important component of surface processing technology. Due
to the small melting pool, large temperature gradient, narrow bonding zone and
high thermal stress, cracks can be easily nucleated, especially in thick metallic
coatings [1, 2]. To prevent cracking is one of the most important issues from the
preparation and industrial points of view [3–5]. Therefore an evaluation of
Keywords
residual stress, focus Ion beam, laser clad coating, digital image
correlation
Related Book
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