Abstract
The aim of this work is to evaluate the microstructural evolutions developed by mixing a corrosion-resistant and high-performance material with a high-hardness material in a coating obtained by laser-cladding technology. In this paper, five different mixtures of Inconel 625 alloy and AISI H13 steel powders have been deposited on a plate of 42CrMo4 steel using a 2.2 kW diode pumped Nd:YAG laser. The effect of adding tool steel to a Ni-based superalloy has been analyzed by the characterization of each cladded sample using optical microscopy and scanning electron microscopy (SEM). The precipitates observed in the samples have been analyzed by energy dispersive X-ray spectroscopy (EDS X-ray). SEM micrographs and EDS analysis indicate the existence of Laves phase. It has been observed that the presence of these precipitates is stabilized in a certain range of AISI H13 addition.
Highlights
Laser cladding is an additive manufacturing process where the filler material—either wire or powder—is melted along with the substrate in order to produce coatings or even 3D parts by depositing layers on top of each other until achieving the desired geometry
Three regions of interest were identified in each coating sample, as shown in Figure 3: the clad zone, which is the top region where the material was melted; the heat affected zone (HAZ)
Microstructure corresponding to the region where the high temperatures of the process affected the original5 of 10 microstructure of the material, and the original substrate
Summary
Laser cladding is an additive manufacturing process where the filler material—either wire or powder—is melted along with the substrate in order to produce coatings or even 3D parts by depositing layers on top of each other until achieving the desired geometry. One of the particular advantages of the laser-cladding process when working with powder as a coating material is the possibility of combining different alloys by mixing them during the process to produce coatings with the desired chemical composition or microstructure. This approach has been widely studied by numerous authors, most of them focusing on producing metal matrix composites by combining hard ceramic particles with a metallic-based (typically Ni or Co) matrix [2,3] or functionally graded coatings (FGC) [4,5,6]. Alemohammad et al mixed titanium and cobalt base powders in order to produce
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