Effect of diffusion borochromizing on microstructure, microhardness and corrosion resistance of tool steel with different carbon content
Journal Title: Journal of Achievements in Materials and Manufacturing Engineering - Year 2017, Vol 2, Issue 80
Abstract
Purpose: The aim of this paper is presents the study results concerning influence of carbon content on the surface layer condition, microstructure, microhardness and corrosion resistance of diffusion borochromized layer. Design/methodology/approach: In paper the three types of tool steel were analysed: CT90, 145Cr6 and 165CrV12. The borochromzing process was carried out in a powder mixture containing B4C, Fe-Cr, Al2O3 at temperature 950°C for 6 h. The source of chromium was Fe-Cr while the source of boron was B4C. Findings: As a result of borochromizing process the layer with microstructure similar to boronized layer was obtained. The thickness of the resulting surface layer was dependent on the carbon content of steel. Microhardness of the borochromized layer was similar to the microhardness of the boronized layer. Additionally the corrosion resistance tests in 5% NaCl solution were performed using a potentiodynamic method. It was found that the best corrosion resistance was characterized a layer on the steel with less carbon content. Originality/value: Value of the paper is analysis of corrosion resistance by potentiodynamic method of the tool steel with borochromized layer.
Authors and Affiliations
A. Bartkowska, D. Bartkowski
Keywords
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