Laser Alloying Monel 400 with Amorphous Boron to Obtain Hard Coatings.

Mateusz Kuklinski,Aneta Bartkowska,Damian Przestacki

doi:10.3390/ma12213494

Mateusz Kuklinski, Aneta Bartkowska + Show 1 more

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https://doi.org/10.3390/ma12213494

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Abstract

In this study, Monel 400 is laser heat treated and laser alloyed with boron using diode laser to obtain adequate remelting and to improve the microhardness Single laser tracks were produced on the surface with three different laser beam scanning velocities: 5, 25, and 75 m/min. In order to enrich Monel 400 with boron surfaces were covered with initial layers of two different thicknesses before the process: 100 μm and 200 μm. In all experiments, laser beam power density was equal to 178 kW/cm2. Produced laser tracks were investigated in areas of microstructure, depth of remelting and microhardness. It was found that remelted zones are mainly composed of dendrites and the more boron is present in the laser track, the dendritic structure more fragmented is. Depth of remelting and microhardness depend not only on the laser beam scanning velocity but also on thickness of the initial boron layer. While microhardness of Monel 400 is equal to approximately 160 HV0.1, microhardness up to 980 HV0.1 was obtained in areas laser alloyed with boron.

Highlights

Laser modification of metals allows in obtaining surface properties of different kinds.This universality results from the fact that laser is precise, non-contact and easy to control heat source [1].Laser remelting helps to increase corrosion resistance, surface quality, and mechanical properties of bulk materials [2,3,4,5] and to improve homogeneity and adhesion to substrate of pre-deposited coatings [6,7].Improvements in surface properties are enhanced if additional materials are delivered to the molten pool [8,9,10]
Monel 400 is laser heat treated and laser alloyed with boron
Laser alloyed with boron, sides of laser tracks seem to be smoother than applied laser scanning is equal to irregularities

Summary

Introduction

Laser modification of metals allows in obtaining surface properties of different kinds.This universality results from the fact that laser is precise, non-contact and easy to control heat source [1].Laser remelting helps to increase corrosion resistance, surface quality, and mechanical properties of bulk materials [2,3,4,5] and to improve homogeneity and adhesion to substrate of pre-deposited coatings [6,7].Improvements in surface properties are enhanced if additional materials are delivered to the molten pool [8,9,10]. Laser modification of metals allows in obtaining surface properties of different kinds. This universality results from the fact that laser is precise, non-contact and easy to control heat source [1]. Laser remelting helps to increase corrosion resistance, surface quality, and mechanical properties of bulk materials [2,3,4,5] and to improve homogeneity and adhesion to substrate of pre-deposited coatings [6,7]. Improvements in surface properties are enhanced if additional materials are delivered to the molten pool [8,9,10]

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Conclusion