Abstract
The present work aims at the microstructural characterization of TiAlZrN/ Al2O3 and TiAlZrN/Si3N4 coatings deposited via lateral rotating cathodes. The coatings were deposited using Lateral Rotating Cathodes (LARC) technology. The deposited coatings were studied for its cross sectional morphology using scanning electron microscopy. Energy Dispersive Spectrometry was also conducted along the cross section to determine the elemental composition. Micro Vickers hardness test was conducted to determine the hardness of the coatings. The scanning electron microscope images showed that TiAlZrN/Al2O3 coatings showed preferred columnar grain orientation with multilayered structure while TiAlZrN/Si3N4 coatings exhibit a dense grain structure. The TiAlZrN/Si3N4 coating shows a hardness of 31.58 GPa while TiAlZrN/Al2O3 coating shows a hardness of 25.40 GPa. Dry turning tests were performed on AISI 304 stainless steel. The TiAlZrN/Si3N4 coatings show reduced flank wear. Both the coatings even under severe cutting conditions impart surface roughness of less than 1.5 μm.
Highlights
High productivity, good finished products and reducing manufacturing costs are major challenges to present metal working industries
The hardness of the deposited coatings increases due to solid solution strengthening, high dislocation density and fine grain size
The TiAlZrN/Si3N4 coatings exhibited a microhardness of 31.58 GPa which was higher than that of TiAlZrN/Al2O3 coating
Summary
Good finished products and reducing manufacturing costs are major challenges to present metal working industries. In view of these factors, dry machining gains its importance in metal working industries It imposes a challenge for the requirement of cutting tool which possesses high thermal stability and wear resistance. The most suited cutting tool for such applications is to use cemented carbide inserts of K25 grade with WC-Co composition These inserts give a poor and erratic surface finish when used to machine the stainless steel alloys at high speeds [7] [8]. The present work aims on the optimization of cutting parameters using Grey Relation Analysis (GRA) in dry turning of AISI 304 stainless steel using TiAlZrN/Si3N4 and TiAlZrN/Al2O3 coated cemented carbide inserts. Further details of the deposition method are described in our previous work [12]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
