Study on High Speed Milling of Steam Turbine Blade Materials - Difference in Cutting Characteristics by Alloying Elements of Stainless Steel

Abstract

In this study, high speed milling of stainless steel was tried for purpose of high efficiency cutting of a steam turbine blade. In the experiment, cutting tool used TiAlN coating radius solid end mill made of cemented carbide. Diameter of end mill is 5mm. Corner radius is 0.2mm. Cutting speed carried out at 100m/s~600m/s. Work pieces was used in the experiment are four kinds of stainless steel which alloy elements differ. Mainly, content of chromium and nickel is different. There are many researches about high speed milling [1, 2].However, the researches which examined relationship between alloy elements of stainless steel and cutting characteristics on high speed milling using small diameter endmill are few.As the results, in the case of stainless steel containing much nickel, tool life becomes short in high speed cutting area. This reason is nickel has low thermal conductivity. Because the cutting point temperature becomes higher. If the coating removes, wear becomes large rapidly. In other words, maximum limit value of cutting speed was found to be dependent on heat resistance temperature of the coating.On the other hand, Chromium has the effect of improving the abrasion resistant of the workpiece. However, Flank wear was not increased in a low cutting speed area. In the range of this experimental condition, chromium didn't influence tool life. When cutting point temperature is below heat resistant temperature of the coating, it is thought that effect of the coating is maintained. Namely, it was found that appropriate cutting speed followed heat resistant temperature of the coating.

STRUCTURAL AND PHASE CHANGES OF THE SURFACE LAYERS OF HEATRESISTANT MULTICOMPONENT COATING OF ION-PLASMA COATING Ni-Cr-Al-Y AFTER MODIFICATION BY HIGH-CURRENT ELECTRON BEAMS MICROSECOND DURATION

“…The development of aerospace engineering, including aviation weapons, as well as other branches of engineering, is mostly provided by the development of new metal materials and advanced technologies (Kablova, 2006;Terentyev et al, 2012;Galoyan et al, 2014;Muboyajyan and Budinovsky, 2017;Nesterov, 2018). With ever-increasing complication and toughening of working conditions of modern technology, the problem of creating materials and their processing types, which along with high strength, increase the level of performance properties has become extremely urgent (Tishkov and Firsanov, 2011;Baranov et al, 2007;Kimura et al, 2016;Abraimov, 2017;Korsmik et al, 2018;Bogdan et al, 2019). It is known that the most loaded and expensive parts and assemblies are parts and assemblies of gas turbine flow path (first of all, the blades and disks of the compressor and turbine), thus, increasing the operational properties of the surface layer has become the most important task of modern aircraft manufacturing ( The solution to this problem is attempted using several approaches: development of promising, highly alloyed, polycrystalline and single crystal alloys; modernization of methods for manufacture, molding, and processing of products and blanks; development of new ways of surface treatment of parts and applying various protective coatings to their surface, including coatings from nanomaterials (Muboyajyan et al, 2012;Matveev et al, 2013;Ovchinnikov and Yakimov, 2016;Gadalov et al, 2017;Shaidurova et al, 2017;Buckhurst and Kaspersen, 2017;Batsikadze et al, 2017).…”