Quality assessment of laser cladded HSS coatings with deep penetration into base material to obtain a smooth gradient of properties in coating-substrate interface
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Failid
Kuupäev
2018
Kättesaadavus
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Kirjastaja
Abstrakt
The present research is dedicated to the study of influence of coaxial laser cladding
(CLC) process parameters onto values of alloying compo
nents content in the coatings,
morphology
as well as the influence of post
-
cladding heat treatment on the quality and
mechanical properties of coatings. The research is based on a hypothesis that applying of first
layer of coatings onto steel substrate wit
h keyhole in penetration allows achieving smooth
gradient of properties of the coating
-
substrate system. As a result it may provide a smooth
distribution of the internal residual stresses in interface as well as the better resistance to external
stress dur
ing cyclic load in tool operation processes: metal forming, stamping etc. Experimental
work was carried out using CLC system, which consists of industrial robot Kuka and 1
kW IPG
Yb
-
fiber laser, integrated to the coaxial powder supplying cladding head. The
regularities of
formation of High Speed Steel AISI М2 cladding coatings created by different regimes were
studied by deposition onto EN 41Cr4 and C80U steel substrates. The quality of achieved coatings
has been evaluated by examination of morphology of tr
ansverse cross
-
sections, coatings
geometrical features, elemental composition and microhardness distribution inside coatings.
Additionally detailed assessment of coating thickness and content of alloying elements using
statistical methods has been performe
d. As a result of the research done the degree of influence
of chosen CLC process parameters onto quality characteristics were estimated. The most
appropriate cladding regime for used method was proposed.
Kirjeldus
Article
Märksõnad
coaxial laser cladding, HSS coating, keyhole in penetration, quality, articles