The effect of chemical composition and heat treatment on mechanical properties of forgings from a pseudo-ß-titanium alloy

Metallurgy and Material Science

Metal science and thermal processing of metals and alloys


Аuthors

Egorova Y. B.1*, Davydenko L. V.2**, Chibisova E. V.3***, Shmyrova A. V.4****

1. ,
2. Moscow Polytechnic University, 38, Bolshaya Semenovskaya str., Moscow, 107023, Russia
3. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
4. Scientific-production enterprise Aerosila, 6, Zhdanov str., Stupino, Moscow region, 142800, Russia

*e-mail: egorova_mati@mail.ru
**e-mail: mami-davidenko@mail.ru
***e-mail: echibisova@mail.ru
****e-mail: shmyrovaalisa@mail.ru

Abstract

The article presents the results of statistical studies of mechanical properties of the deformed semi-finished products from Ti-10V-2Fe-3Al titanium alloy based on analysis of literature, experimental and commercial data, by the “Stadia 7” software package. The effect of reheat temperature for quenching Th, as well as ageing temperature Tag on mechanical properties was evaluated by method of regressive analysis of the published tе data. Equations for computing polymorphic transformation temperature beta-transus temperature βtr and the quantity of primary α-phase, formed while quenching process on the temperatures interval from 700 °C to βtr were obtained:

βtr = 890 + 22,3Al - 13,9V - 8,0Fe,

nα = (0,3 ± 0,02)·( βtr-Тh), %

.

1608 ingots and die forgings, manufactured by the industrial technology in 2007-2016 were also the subjects of research. All forgings were subjected to thermal treatment, consisted of quenching (763-798°C for three hours followed by water cooling) and ageing (500-515°C for 8 hours followed by air cooling).

The following factors were selected for statistical analysis: alloying elements’ and impurities’ content, beta-transus temperature, alloy structural equivalents in aluminum    and molybdenum, hardening temperature Th and the aging temperature Tag, the mechanical properties (offset yield strength σ0,2, tensile strength σв, elongation δ , reduction of area ψ , fracture toughness K1C). Primary statistical processing and correlation-regression analysis were performed.

Correlations between mechanical properties with deviations of the brand composition and heat treatment modes were established. At the first stage, pairwise correlations between the investigated factors were analyzed. The results of the analysis revealed that each element separately either does not affect, or affects weakly the level of mechanical properties of forgings, which is most likely stipulated by small intervals of their change. The joint action of the elements, which was evaluated by and , appeared to be more significant, the coefficient of multiple correlation was R=0.3-0.5, the fraction of the of the properties variation was γ ≈10-25%. Coefficients of multiple property correlation with quenching temperature and aging temperature were equal to R = 0,3-0,6 depending on the year of production. The joint effect on theproperties of all four factors (, ,Тh, Тag) is evaluated by the coefficients R = 0,35-0,67, γ ≈ 12-45 %. The rest of the variation is stipulated by factors that could not be determined based on the data studied. The generalized regression dependence of the tensile strength of Ti-10-2-3 forgings on the chemical composition and heat treatment modes is:

Keywords:

chemical composition, mechanical properties, heat treatment of Ti-10V-2Fe-3Al (Ti-10-2-3) alloy

References

  1. Kershenbaum V. Mezhdunarodnyi translyator sovremennykh stalei i splavov (International translator of modern steels and alloys), Moscow, Nauka i tehnika, 1992, vol. 3 – 650 p.

  2. Il'in A.A., Kolachev B.A., Pol'kin I.S. Titanovye splavy. Sostav, struktura, svoistva (Titanium alloys. Composition, structure, properties), Moscow, VILS–MATI, 2009, 520 p.

  3. Boyer R., Collings E.W., Welsch G. Materials Properties Handbook. Titanium Alloys. OH, USA, ASM International, Materials Park, 1994, 1176 p.

  4. Kondrashov E.N., Leder M.O., Rusakov K.A. Titan, 2017, no. 1(55), pp. 22-27.

  5. Egorova Yu.B., Uvarov V.N., Davydenko L.V., Davydenko R.A. Metallovedenie i termicheskaya obrabotka metallov, 2017, no. 6, рр. 52-58.

  6. Titanium Science and Technology. Proceedings, ed. by R.I. Jaffeе and H.M. Burte, 2nd International Conference on Titanium, New York, Plenum Press, 1973, vol. 3, pp. 1945-1956, pp. 1993-1995.

  7. Titan. Metallovedenie i tekhnologiya. Trudy 3-i mezhdunarodnoi konferentsii po titanu, Moscow, VILS, 1977-1978.

  8. Titanium'80. Science and Technology. Рroceedings of the Fourth International Conference on Titanium, Kyoto, Japan, May 19-22, 1980. Vol. 1 – pp. 469-475. Vol. 2 – pp. 1571-1581.

  9. Titanium'84. Science and Technology: Рroceedings of the Fifth International Conference on Titanium, FRG, Munich, 1984. Vol. 2 – pp. 1261-1267, 1307-1313.

  10. Titanium'95: Science and Technology: Рroceedings. 8th World Conference on Titanium, Birmingham, UK, London, 1996. Vol. 1 – pp. 948-955, 1147-1154. Vol. 2 – pp. 1243-1250, 1371-1378.

  11. Titanium'99. Science and Technology: Рroceedings 9th World Conference on Titanium, Saint-Petersburg, Russia, 7-11 July 1999. Vol. 1 – pp. 487-492, 529-536. Vol. 2 – pp. 1164-1170, 1187-1194, 1219-1226. Vol. 3 – pp. 1548-1552.

  12. Titanium'2003. Science and Technology. Рroceedings 10th World Conference on Titanium, Hamburg, Germany, 13-18 July 2003. Vol. 1 – pp. 470-477. Vol. 2 – pp. 1219- 1226. Vol. 3 – pp. 1895-1902. Vol 4 – pp. 2051-2057, 2615-2626, 2643-2653, 27 13-2717. Vol. 5 – pp. 3059-3066.

  13. Titanium'2007. Science and Technology. Рroceedings 11th World Conference on Titanium, Kyoto, Japan, 3-7 June 2007. Vol. 1 – pp. 95-98, 443-446, 529-536, 571-575. Vol. 2 – pp. 929-932, 1255-1262, 1295-1300.

  14. Yedla Natraj, Nagenswar Rao GVS, TK Nandy. Heattreatment-Microstructure and Tensile behavior of Ti-10V-3Fe-3Al. Germany, Saarbrucken, LAP Lambert Academic Publishing, 2011, 64 p.

  15. Tetyukhin V.V., Levin I.V., Musatov M.I., Chechulin S.M., Tarenkova N.Yu. Tekhnologiya legkikh splavov, 2007, no. 4, pp. 7-12.

  16. Soldatenko I.V. Vestnik Moskovskogo aviatsionnogo instituta, 2016, vol. 23, no. 4, pp. 189-194.

  17. Rosenberg H.W. Ti-10V-2Fe-3Al: A forging alloy development, Proceedings of the Metal Society Conference on Forging and Properties of Aerospace Materials, The Metals Society, London, 1978, pp. 279-299.

  18. Duerig T.W., Richter D.F., Albrecht J. Shape memory in Ti-10V-2Fe-3Al, Scripta Metallurgica, 1982, vol. 16, pp. 957 −961.

  19. Zhongquan D., Yuxiu C., Gaochao W., Yimin W. Study on optimizing Isothermal Forging Technological parameters of Ti-10V-2Fe-3Al by Way of Computer Programme, Advanced Technology of Plasticity, 1990, vol. 1, pp. 279-283.

  20. Boyer R.R., Kuhlman G.W. Processing Properties relationships of Ti-10V-2Fe-3Al, Metallurgical Transactions A, 1987, vol. 18, issue 12, pp. 2095–2103.

  21. Toyama K., Maeda T. The Effect of Heat Treatment on the Mechanical Properties of Ti-10V-2Fe-3Al, Transactions Iron and Steel Institute of Japan, 1986, vol. 26, pp. 814-821.

  22. Goken J., Fayed S., Skubisz P. Strain-dependent damping of Ti10V2Fe3Al at room temperature, Acta Physica Polonica A, 2016, vol. 130, no. 6, pp. 1352 – 1357. DOI: 10.12693/APhysPolA.130.1352

  23. Kulaichev A.P. Meto dy i sredstva kompleksnogo analiza dannykh (Methods and means of the complex analysis of data), Мoscow, FORUM, INFRA-M, 2006, 512 p.

  24. Aleksandrov V.K., Anoshkin N.F., Belozerov A.P. Polufabrikaty iz titanovykh splavov (Semi-finished products from titanium alloys), Мoscow, VILS, 1996, 581 p.

  25. Kalugina M.S., Remshev E.Yu., Danilin G.A., Vorob'eva G.A., Pekhov V.A. Vestnik Moskovskogo aviatsionnogo instituta, 2017, vol. 24, no. 2, pp. 185-196.

mai.ru — informational site of MAI

Copyright © 1994-2024 by MAI