Specially designed samples of laser clad AlSi40 functionally graded materials (FGM) are made for evaluating the interfacial adhesion. To obtain the interfacial bond strength notches are made right at the interface of the FGMs. In-situ microstructural observations during straining in a field-emission gun environmental scanning electron microscopy reveal different failure modes of the FGMs and substrate. Mapping of strain fields using digital imaging correlation shows a gradual transition of deformation over the interface region and softening effects in the heat-affected zones of the FGM tracks. The strengthening of the FGM is dominated by the size of the Al halos around the particles, in accordance with a dislocation pile-up model.

Dahotre, NB

de Hosson, J.T.M.

Kopech, HM

Midea, SJ

Ocelik, V.

Pei, Y.T.

Popoola, O

English

Specially designed samples of laser clad AlSi40 functionally graded materials (FGM) are made for evaluating the interfacial adhesion. To obtain the interfacial bond strength notches are made right at the interface of the FGMs. In-situ microstructural observations during straining in a field-emission gun environmental scanning electron microscopy reveal different failure modes of the FGMs and substrate. Mapping of strain fields using digital imaging correlation shows a gradual transition of deformation over the interface region and softening effects in the heat-affected zones of the FGM tracks. The strengthening of the FGM is dominated by the size of the Al halos around the particles, in accordance with a dislocation pile-up model

Pei, Y. T.

De Hosson, J. T. M.

ARTS repository - University of Groningen

Interfacial adhesion of laser clad functionally graded materials

Proceedings - University of Groningen

Two functionally graded coatings were prepared by different laser surface engineering techniques. Laser cladding of AlSi40 powder leads to the formation of functionally graded material (FGM) coating on AI-Si cast alloy substrate. Mapping of strain fields near the laser clad track using the digital image correlation shows a gradual transition of deformation over the interface region and the softening effect in the heat affected zone of the FGM tracks. Specially designed sample with such a coating allows the experimental determination of adhesion strength between FGM coating and substrate. Laser melt injection technique was used to prepare functionally graded WC/TiAl-V metal matrix composite (MMC) coating. Orientation imaging microscopy of reaction zones in this coating shows that crack initiation and crack propagation processes strongly depends on the existence of orientation relationship between the particulate and the new phases formed around it during melt solidification. The wear test performed on this coating at a boundary lubrication condition confirmed the excellent bonding between WC particle and Ti-alloy matrix and results in extreme improvement of wear resistance. In-situ microstructural observations during straining in an environmental scanning electron microscope reveal different failure modes of functionally graded materials prepared by different laser surface engineering techniques.</p

Dissertations of the University of Groningen

Two functionally graded coatings were prepared by different laser surface engineering techniques. Laser cladding of AlSi40 powder leads to the formation of functionally graded material (FGM) coating on AI-Si cast alloy substrate. Mapping of strain fields near the laser clad track using the digital image correlation shows a gradual transition of deformation over the interface region and the softening effect in the heat affected zone of the FGM tracks. Specially designed sample with such a coating allows the experimental determination of adhesion strength between FGM coating and substrate. Laser melt injection technique was used to prepare functionally graded WC/TiAl-V metal matrix composite (MMC) coating. Orientation imaging microscopy of reaction zones in this coating shows that crack initiation and crack propagation processes strongly depends on the existence of orientation relationship between the particulate and the new phases formed around it during melt solidification. The wear test performed on this coating at a boundary lubrication condition confirmed the excellent bonding between WC particle and Ti-alloy matrix and results in extreme improvement of wear resistance. In-situ microstructural observations during straining in an environmental scanning electron microscope reveal different failure modes of functionally graded materials prepared by different laser surface engineering techniques

NARCIS 

University of Groningen

de Hosson,

Metallurgical and Ceramic Protective Coatings,

Interfacial adhesion of laser clad functionally graded materials

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ARTS repository - University of Groningen

Proceedings - University of Groningen

Dissertations of the University of Groningen

NARCIS

Dissertations of the University of Groningen

Dissertations of the University of Groningen

University of Groningen

Proceedings - University of Groningen

Dissertations of the University of Groningen

NARCIS