Abstract
The paper presents the results of a study of the microstructure, chemical composition, microhardness and corrosion resistance of Cr-B coatings produced on Vanadis 6 tool steel. In this study, chromium and boron were added to the steel surface using a laser alloying process. The main purpose of the study was to determine the impact of those chemical elements on surface properties. Chromium and boron as well as their mixtures were prepared in various proportions and then were applied on steel substrate in the form of precoat of 100 µm thickness. Depending on the type of precoat used and laser processing parameters, changes in microstructure and properties were observed. Coatings produced using precoat containing chromium and boron mixture were characterized by high microhardness (900 HV0.05–1300 HV0.005) while maintaining good corrosion resistance. It was also found that too low laser beam power contributed to the formation of cracks and porosity.
Highlights
The laser is a universal high-energy source that can be used, among other purposes, for marking, cutting and modifying ferrous and nonferrous alloys, which is interesting and discussed in many scientific papers [1,2,3,4,5]
The coatings obtained with the laser beam power of 750 and 950 W were characterized by a uniform microstructure devoid of porosity and cracks
This study analyzed changes in microstructure, chemical composition, microhardness, and corrosion resistance of Cr-B coatings produced on Vanadis 6 tool steel with the use of a diode laser beam
Summary
The laser is a universal high-energy source that can be used, among other purposes, for marking, cutting and modifying ferrous and nonferrous alloys, which is interesting and discussed in many scientific papers [1,2,3,4,5]. Parts of machines and devices used in industry often have to meet stringent conditions They result, among other factors, from high operating temperature, variable and cyclical nature of loads or aggressive and corrosive environment. These factors often create the necessity to use more and more advanced materials rich in alloying elements, which naturally leads to their price increase. This clearly reduces attractiveness of products and services offered. This ensures high operational properties while maintaining relatively low product costs
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