Consolidation Efficiency of Noncompact Alloys by Diamond Burnishing

Active use of parts synthesized while using additive technologies from powders is limited due to presence of residual porosity contributing to a decrease in strength, ductility, fracture toughness, crack resistance, workability by cutting, as well as tribotechnical characteristics. It has been proposed in order to expand scope of parts application derived from non-compact alloys to use methods of surface layer hardening. Specific features of local surface-plastic deformation have been investigated by diamond smoothing of samples from a sintered titanium alloy ВT1-0, as well as an alloy based on titanium aluminides LMD ОX 45-3 (Ti–45Al–3Nb) synthesized by selective laser sintering. It has been established that diamond burnishing is an effective method of compacting surface layer of samples from low-plastic non-compact materials obtained by various methods. It has been shown that in order to eliminate effectively porosity and increase strength of a surface layer for bearing surfaces of parts made from these materials, processing must be performed in a narrow range of mode parameters taking into account mechanical properties of the material, residual porosity and tool parameters. For example, application of diamond smoothers with a sphere radius of 0.5 mm leads due to a small contact surface of a tool and low ductility of the material being processed to destruction of the surface layer, as the tool “fails” into large pores, which causes spalling of the material or uneven effect of the tool on the surface layer. It has been determined that for the effective application of the established regimes it is necessary to take into account an initial porosity which has a random distribution over the surface area of the studied samples. For maximum compaction efficiency of an alloy based on a sintered titanium alloy ВT1-0, as well as an alloy based on titanium aluminides LMD ОХ 45-3 (Ti–45Al–3Nb), a cumulative effect of smoothing parameters should be taken into account.

1. Manokhin A. I., Shornikov M. Kh. (1988) Development of Powder Metallurgy. Moscow, Nauka Publ. 77 (in Russian).

2. Nazarov A. P., Okunkova A. A. (2012) Type Specimens of Products Obtained while Using Method of Selective Laser Sintering. Vestnik Saratovskogo Gosudarstvennogo Tekhnicheskogo Universiteta = Vestnik Saratov State Technical University, 67 (3), 76–83 (in Russian).

3. Antsiferov V. N. (2014) Prospective Materials and Technologies of Powder Metallurgy. Perm, Perm State Technical University. 109 (in Russian).

4. Egorov M. S., Vernigorov Yu. M., Egorova R. V. (2017) Technology and Features of Manufacturing Parts by Powder Metallurgy. Rostov-na-Donu, Don State Technical University. 63 (in Russian).

5. Shoichi K., Takafumi I., Hiroki K., Yoshikazu N., Mie O., Akira U., Kei A. (2016) Effect of Harmonic Structure Design with Bimodal Grain Size Distribution on NearThreshold Fatigue Crack Propagation in Ti–6Al–4V Alloy. International Journal of Fatigue, 92, 616–622. https://doi.org/10.1016/j.ijfatigue.2016.02.038.

6. Pavlenko D. V. (2017) Gas Saturation Assessment of Sintered Titanium Alloy Synthesized from Powder while Using Screw Extrusion. Poroshkovaya Metallurgiya = Powder Metallurgy, (5/6), 46–59 (in Russian).

7. Kablov E. N., Lukin V. I. (2008) Intermetallides Based on Titanium and Nickel for Products Used in New Equipment. Avtomaticheskaya Svarka = Automatic Welding, (11), 76–82 (in Russian).

8. Kapustyan A. E., Ovchinnikov A. V., Pavlov V. V., Shul'ga K. S., Shevchenko V. G. (2015) Influence of Pressing and Sintering Modes on Porosity of Sintered Titanium Products. Obrabotka Materialov Davleniem: Sbornik Nauchnykh Trudov [Pressure Material Treatment: Collection of Scientific Papers]. Kramatorsk, 41 (2), 221–225 (in Russian).

9. Skrebtsov A. A., Ovchinnikov A. V., Shevchenko V. G., Mikhailyutenko O. A., Zhila T. A. (2017) Obtaining Products from Titanium Alloys while Using Additive Methods. Stroitel'stvo, Materialovedenie, Mashinostroenie: Sb. Nauch. Trudov [Construction, Material Science, Mechanical Engineering: Collection of Scientific Papers. Starodubovskiye Reading-2017). Dn?propetrovsk, 95, 118–122 (in Russian).

10. Petrik I. A., Ovchinnikov A. V., Seliverstov A. G. (2015) Development of Titanium-Alloy Powder for Additive Technologies with Regard to Gas-Turbine Engine Parts. Aviatsionno-Kosmicheskaya Tehnika i Tehnologiya [Aviation and Space Equipment and Technology], 125 (8), 11–16 (in Russian).

11. Pavlenko D. V., Ovchinnikov A. V. (2015) Influence of Deformation on Structure and Properties of ??1-0 Alloy in Various States while Using Method of Screw Extrusion. F?ziko-Kh?m?chna Mekhan?ka Mater?al?v [Physical and Chemical Mechanics of Materials], (1), 50–57 (in Russian).

12. Pavlenko D. V. (2015) Increase of technological Plasticity in Sintered Titanium Alloys. Protsesi Mekhan?chnoy Obrobki v Mashinobuduvann? [Processes of Mechanical Machining in Machine-Building], (15), 102–112 (in Russian).

13. Pavlenko D. V., Beygel’zimer Ya. E. (2016) Vortices in Noncompact Blanks During Twist Extrusion. Powder Metallurgy and Metal Ceramics. 54 (9–10). 517–524. https://doi.org/10.1007/s11106-016-9744-9.

14. Vishnepol'skii E. V., Pukhal'skaya G. V., Glikson I. L. (2009) Increase of Fatigue Resistance in Stress Concentration Zones of Cylindrical Shells while Using Diamond Burnishing. V?snik Dvigunobuduvannja = Herald of Aeroenginebuilding, (1), 90–94 (in Russian).

15. Eldarzade E. G., Kuliev A. A. (2016) Specific Features in polishing of Parts Made from Powder Materials Based on Iron. Aktualnye Problemy Gumanitarnykh i Estestvennykh Nauk [Current Problems of Humanitarian and Natural Sciences], 1 (12), 154–148 (in Russian).

16. Papshev D. D. (1978) Finish Machining and Strengthening Treatment while Using Surface Plastic Deformation. Moscow, Mashinostroenie Publ. 152 (in Russian).

17. Odintsov L. G. (1987) Strengthening and Finishing of Parts while Using Surface Plastic Deformation. Moscow, Mashinostroenie Publ. 328 (in Russian).

18. Granovsky E. G. (1968) Measuring of Wear in Diamond Smoothing Devices. Izvestiya Vuzov. Mashinostroenie [News of Higher Educational Institutions], (11), 128–131 (in Russian).

19. Kenel C., Dawson K., Barras J., Hauser C., Dasargyri G., Bauer T., Colella A., Spierings A. B., Tatlock G. J., Leinenbach C., Wegener K. (2017) Microstructure and Oxide Particle Stability in a Novel ODS ?-TiAl Alloyprocessed by Spark Plasma Sintering and Laser Additive Manufacturing. Intermetallics, 90, 63–73. https://doi.org/10.1016/j.intermet.2017.07.004.

20. Pavlenko D. V., Ovchinnikov ?. V. (2015) Effect of Deformation by the Method of Screw Extrusion on the Structure and Properties of ??1-0 Alloy in Different States. Materials Science, 51 (1), 52–60. https://doi.org/10.1007/s11003-015-9809-9.