Abstract
The article describes the results of the investigation focused on the properties of the Zr,Hf-(Zr,Hf)N-(Zr,Hf,Me,Al)N coatings, where Me means chromium (Cr), titanium (Ti), or molybdenum (Mo). These coatings have three-layer architecture, including adhesion, transition, and wear-resistant layers, while the latter, in turn, has a nanolayer structure. Despite the fact that the coatings under study have close values of hardness and critical fracture load LC2, there are noticeable differences in wear resistance during the turning of steel. The tools with the coatings under study demonstrated better wear resistance compared to an uncoated tool and the tool with the commercial ZrN coating. The best wear resistance was detected for a tool with the Zr,Hf-(Zr,Hf)N-(Zr,Hf,Ti,Al)N coating. The study of the pattern of cracking in the structure of the coatings has found that, during the cutting process, active cracking occurs in the coating with Cr, which leads to the fracture of the coating, while the process of cracking is noticeably less active in the coatings with Ti or Mo.
Highlights
Wear-resistant coatings for cutting tools have been widely and successfully used since1980s and manufactures continue to improve them
After 5 min of cutting, the average flank wear VB detected for the uncoated tool was 1.8 times higher than for the tools with the coatings H1, H2, and H3 and 1.5 times higher than for the ZrN-coated tool
The considered coatings have close values of hardness and critical fracture load LC2 ; After 5 min of cutting, the average flank wear VB detected for the uncoated tool was
Summary
Wear-resistant coatings for cutting tools have been widely and successfully used since1980s and manufactures continue to improve them. While the intensification of cutting modes and, first of all, cutting speeds requires an increased heat resistance, the resistance of tools to brittle fracture and cracking remains relevant [1,2,3,4,5,6,7]. If we formulate the basic requirements for wear-resistant coatings for cutting tools, the list is as follows: . Maximum hardness to resist abrasive wear; Maximum strength to resist adhesive-fatigue wear and brittle fracture, including resistance to cracking; Maximum heat resistance to maintain basic performance properties at high temperatures; Ability to provide optimal tribological parameters in the cutting zone, including at high temperatures; Ability to effectively perform barrier functions in relation to the diffusion of elements of the material being machined and oxygen
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