Service properties of ultrafine-grained Ti–6Al–4V alloy at elevated temperature
This study deals with investigation of mechanical properties and fatigue behavior of the ultra-fine grained (UFG) alloy Ti–6Al–4V at elevated temperatures. UFG samples were produced by means of combination of equal-channel angular pressing and thermomechanical treatments. Studies of the temperature dependence of mechanical properties of the UFG alloy demonstrated their thermal stability upto 175–350 °C. It was revealed that 100-hour creep rupture strength at 300 °C increased from 750 MPa in the conventional state to 890 MPa in the UFG state. The alloy demonstrates stability of the UFG structure at 300 and 370 °C in the conditions of long-term tests. The fatigue tests were conducted with axial loading applied on a sample at 175 °C, the asymmetry factor of the cycle was 0.1. The fatigue endurance limit of the UFG alloy was almost 50 % higher than that of the CG alloy.
KeywordsFatigue Severe Plastic Deformation Coarse Grained Creep Rupture Strength Coarse Grained Sample
The study has been conducted under the support of Federal Target Program within the state contract No 14.740.11.0134.
- 4.Stolyarov VV, Shestakova LO, Zharikov AI, Latysh VV, Valiev RZ, Zhu YT, Lowe TC (2001). In: Proceedings of 9th International Conference on Titanium-99, Nauka. 2001, vol 1, p 466Google Scholar
- 8.Boyer R, Welsch G, Collings E (1998) Materials properties handbook: titanium alloys. ASM International, OhioGoogle Scholar
- 11.Kolobov Yu, Grabovetskaya GN, Ivanov KV, Valiev RZ, Zhu Y.T (2004). In: Zhu YT, Langdon TG, Semiatin SL, Shin DH, Lowe TC (eds) Proceedings of ultrafine grained materials III, 2004, p 621Google Scholar
- 12.Method of thermomechanical treatment of two-phase titanium alloys. Patent RF No 2,285,740 RU C1, C22F 1/18, 20 Oct 2006Google Scholar
- 13.ASTM E8-01 Standard test methods for tension testing of metallic materialsGoogle Scholar
- 14.ASTM E139-11 Standard test methods for conducting creep, creep-rupture, and stress-rupture tests of metallic materialsGoogle Scholar
- 15.ASTM E468-11 Standard practice for presentation of constant amplitude fatigue test results for metallic materialsGoogle Scholar
- 16.GOST 25.502-79. Standard mechanical test methods. Fatigue tests methods. M. 34C (in Russian)Google Scholar
- 17.Semenova IP, Saitova LR, Islamgaliev RK, Dotsenko TV, Kilmametov AR, Demakov SL, Valiev RZ (2005) Phys Metallogr 100(1):77Google Scholar
- 20.Blum W, Eisenlohr P, Sklenička V (2009) Creep behavior of bulk nanostructured materials—time-dependent deformation and deformation kinetics. In: Zehetbauer MJ, Zhu T (eds) Bulk nanostructured materials. Wiley-VCH, WeinheimGoogle Scholar