Experimental Comparative Study On PVD/CVD Coated Cemented Carbide Insert During Cutting Of Austenitic Stainless Steel

Austenitic stainless steel has widespread application in industry because of its good corrosion resistance, and it is used for chemical industry, medical machine, pipes, pharmacy, aerospace, and so on. As austenitic stainless steel belong to difficult-to-machine materials, during the machining process, it has these cutting performances, such as high plasticity and tenacity, tendency to work-hardening, low thermal conductivity, large affinity and chip broken not very easy, therefore, the research on cutting austenitic stainless steel is always a difficulty.In recent years, how to use the coated cemented carbide inserts for machining such materials become a research hotspot. Because of its high hardness and wear resistance, good chemical stability, it can resolve series of problems, such as tool life, surface roughness and so on. According to the different coating methods, we divide them into PVD and CVD coating.In order to provide data and theory support for subsequent analysis of experimental results, the performance of test inserts was measured and analyzed, including bonding force between coating and substrate, the coating friction coefficient, groove profile and microstructure of coating and substrate. PVD and CVD coated cemented carbide tools would show different application characteristics during cutting process because of the distinguish from coating properties and structure. Inserts’condition of Chip broken, cutting force, cutting heat, wear form and mechanism is investigated. It is a main line that research from cutting force to heat and thermal influence the inserts’wear, comparison and analysis on the PVD and CVD coated cemented carbide Inserts’application characteristics during machining austenitic stainless steel. Through this research, the scanning electron microscope(SEM) and energy spectrum analysis(EDS) is use for watch the condition of blade wear and analysis of the mechanism.The results indicated that in different processing conditions, PVD and CVD coating inserts’blade wear, cutting force and heat will show the respective characteristics and advantages in the process of machining austenitic stainless steel. The PVD coated cemented carbide Inserts was better adopted to the condition at lower cutting speed, feed rate and cutting depth, on the contrary, the CVD coated cemented carbide Inserts could present a better performance at heavier load.