Investigation of the machinability by milling of the laser sintered Inconel 625/NiTi-TiB2 composite

OBRABOTKAMETALLOV Vol. 23 No. 1 2021 TECHNOLOGY Investigation of the machinability by milling of the laser sintered Inconel 625/NiTi-TiB 2 composite Alexey Arlyapov 1, a,* , Sergei Volkov 1, b , Vladimir Promakhov 2, c , Alexander Zhukov 2, d 1 National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk, 634050, Russian Federation 2 National Research Tomsk State University, 36 Lenin Avenue, Tomsk, 634050, Russian Federation a https://orcid.org/0000-0002-5117-4663 , arlyapov@tpu.ru, b https://orcid.org/0000-0001-9984-9466, vsu@pkmion.ru , c https://orcid.org/0000-0002-4385-3404, vvpromakhov@mail.ru , d https://orcid.org/0000-0002-9814-4365, zhuk_77@mail.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2021 vol. 23 no. 1 pp. 21–32 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2021-23.1-21-32 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 10 April 2020 Revised: 15 April 2020 Accepted: 19 December 2020 Available online: 15 March 2021 Keywords : M illing C utting parameters To ol life C utting forces C omposite Ti tanium diboride La ser sintering F unding T his work was carried out with partial fi nancial support from the Russian Science Foundation No. 20-79-10086. ABSTRACT Introduction. The processing capability of milling a met al-matrix comp osite based on Inconel 625 with the addition of NiTi-TiB 2 , obtained by laser sintering, is investiga ted. The com posite is intended for turbine blades manufacture and has strength characteristics close to Inconel 625 , however, due to the addition of TiB 2 , its’ heat- and wear resistance is higher. This material is new; its machinabili ty has not been studied yet. The aim of the work is to determine the technological capabilities of milling with en d mills of this composite. Investigations. The new composite is milled with end mills, and recommendations on the selection of cutting speed, milling depth and width are obtained. Experimental Methods. Measuring end mill wear and cutting force. Wear is assessed by the fl ank chamfer using a microscope, and cutting forces are measure d with a Kistler 9257B dynamometer. Milling is carried out at three speeds: 25, 35 and 50 m/min. To determine the optimal parameters of the depth and width of milling, the fo llowing ratios are used: 1 : 1, 1 : 4; 1 : 16, while the volume of chips removed per unit of time remained constant fo r all ratios. Results and Discussion. The back surface of the cutter teeth wears out more intensively. After reaching the wear chamfer along the fl ank surface of a value equal to 0.11...0.15 mm, there is a sharp increase in forces and brittle destruction of the tooth. Milling at a speed of 25 m/min guaranteed 28 minutes of stable operation, after which the amount of wear quickly approached the critical value of 0.11 mm, at a cutting speed of 50 m/min, critical wear occurred already after 14 minutes. The dependences of the cutting force on time for all selected cutting speeds, throughout the test time, have an increasing character, which indicates the effect of wear of cutters on cutting forces. It is found that the durability of cutters increases with increasing width and decreasing the depth of milling. F or citation: Arlyapov A.Yu., Volkov S.Yu., Promakhov V.V., Zhukov A .S. Investigation of the machinability by milling of the laser sintered I nconel 625/NiTi-TiB 2 composite. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2 021, vol. 23, no. 1, pp. 21–32. DOI: 10.17212/1994-6309-2021-23.1-2 1-32. (In Russian). ______ * Corresponding author Arlyapov Alexey Yu. Ph.D. (Engineering), Associate Professor National Research Tomsk Polytechnic University, 30 Lenin Avenue, 634050, Tomsk, Russian Federation Tel.: +7-906-947-5044 , e-mail: arlyapov@tpu.ru Introduction Currently, metal alloys and composites obtained using additive technologies are becoming increasingly common. Such materials may have higher parameters of strength, hardness, and wear resistance in comparison with materials obtained by classical fusion. At the moment, about 29 metals and alloys are produced in the form of powders, including stainless and tool steels, aluminum alloys, as well as heat- resistant steels [1]. The creation of powder materials allows for obtaining new properties of alloys by changing the structure of the material in a certain way.