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

OBRABOTKAMETALLOV Vol. 23 No. 1 2021 31 TECHNOLOGY References 1. Promakhov V., Zhukov A., Ziatdinov M., Zhukov I., Schulz N., Kovalchuk S., Dubkova Y., Korsmik R., Klimova-Korsmik O., Turichin G., PerminovA. Inconel 625/TiB2 metal matrix composites by direct laser deposition. Metals , 2019, vol. 9, iss. 2, p. 141. DOI: 10.3390/met9020141. 2. Zhang B., Bi G., Nai S., Sun C., Wei J. Microhardness and microstructure evolution of TiB2 reinforced Inconel 625/TiB2 composite produced by selective laser melting. Optics and Laser Technology , 2016, vol. 80, pp. 186–195. DOI: 10.1016/j.optlastec.2016.01.010. 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 : Milling Cutting parameters Tool life Cutting forces Composite Titanium diboride Laser sintering Funding This 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 metal-matrix composite based on Inconel 625 with the addition of NiTi-TiB 2 , obtained by laser sintering, is investigated. The composite 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 machinability has not been studied yet. The aim of the work is to determine the technological capabilities of milling with end 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 measured 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 following ratios are used: 1 : 1, 1 : 4; 1 : 16, while the volume of chips removed per unit of time remained constant for 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. For citation: Arlyapov A.Yu., Volkov S.Yu., Promakhov V.V., Zhukov A.S. Investigation of the machinability by milling of the laser sintered Inconel 625/NiTi-TiB 2 composite. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2021, vol. 23, no. 1, pp. 21–32. DOI: 10.17212/1994-6309-2021-23.1-21-32. (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