Abstract
Specific energy is a key process parameter during laser cladding of high entropy alloy (HEA); however, the effect of specific energy on the microstructure, hardness, and wear resistance of HEA coating has not been completely understood in the literature. This paper aims at revealing the influence of specific energy on the microstructure and properties of laser cladded FeCoCrNi high entropy alloy on the Ti6Al4V substrate, and further obtains feasible process parameters for preparation of HEA coating. Results indicate that there are significant differences in the microstructure and properties of the coatings under different specific energy. The increase of specific energy plays a positive role in coarsening the microstructure, promoting the diffusion of Ti from the substrate to HEA coating, and subsequently affects the hardness of samples. The HEA coating is mainly composed of the face-centered cubic phase and body-centered cubic phase, precipitating a small amount of Fe-Cr phase and Laves phase. Metallurgical bonding is obtained between the base metal and the coatings of which the bonding region is mainly composed of columnar crystal and shrinkage cavities. The microhardness of the HEA coating reaches 1098 HV, which is about 200% higher than that of the TC4 substrate, and the wear resistance is significantly improved by the HEA coating.
Highlights
Titanium alloy has been widely used in the aerospace industry due to its superior advantages of low density, high strength, and anti-corrosion performance [1,2,3,4] the service life of the titanium alloy structural part is restricted by the insufficient wear resistance and hardness
The results show that the specific energy has an important effect on the volume of the molten pool, which is expressed in the reinforcement, width, and melting depth
Is slightly than the Results a better FeCoCrNi obtained than that from be attributed to theindicate localizedthat metallurgical changes thatcoating occur inisthe
Summary
Titanium alloy has been widely used in the aerospace industry due to its superior advantages of low density, high strength, and anti-corrosion performance [1,2,3,4] the service life of the titanium alloy structural part is restricted by the insufficient wear resistance and hardness. The surface strengthening of titanium alloy has attracted massive attention from researchers worldwide [5,6]. HEA rapidly attracts massive attention in material science since it was first reported [10,11,12]. HEA has created an unexplored area of alloy compositions and exploited the potential to influence solid solution phase stability through the controlling of configurational entropy. Preparation of HEA coating on titanium alloy is a feasible method to improve surface hardness and wear resistance of titanium alloy.
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