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Effect of Carbon Additives on the Mechanical Properties of a Titanium Near-α Alloy

  • METAL SCIENCES. METALLURGY
  • Published:
Inorganic Materials: Applied Research Aims and scope

Abstract

The effect of carbon added at 0.008 to 0.18 wt % on the temperature of complete polymorphic transformation, microstructure, and mechanical properties of the titanium near-α alloy of the system Ti–6.2Al–Sn–Zr–(2.19–3.53) Moeq–(0.18–0.28) Si–(0.008–0.18)C has been studied. TGU-type titanium sponge or industrial ligatures of AMNTU and AVTU grades can be used to introduce carbon into the alloy. Studies of six experimental forgings performed on bimodal microstructured ingots (globular-lamellar structure) enabled the assessment of the optimal level of carbon in the alloy. An increase in carbon content to the limit of solubility in an α-solid solution (up to 0.08 wt %) led to an increase in the heat resistance of the material, but the effect of an increase in silicon content was more pronounced. Carbon added at concentrations within the solubility range had an insignificant effect on the short-term strength of the titanium near-α alloy at room temperature, whereas the effect of carbon on impact toughness was detrimental. The impact viscosity remained at an acceptable level of KCU = 330–381 kJ/m2 at the strength \(\sigma _{{\text{u}}}^{{20}}\) = 1165–1180 MPa at the carbon concentration selected. Hot deformation of the alloys of the system studied by free forging on a hammer at relatively low temperatures of the biphasic area is allowable.

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Funding

The study was supported by the Russian Foundation for Basic Research as part of the project entitled “A Study of the Regularities Underlying the Formation of Recrystallization Texture in Titanium Pseudo-Alpha and Alpha+Beta Alloys of the Ti–Al–Sn–Zr–Si System + Beta Stabilizers for the Development of a Thermomechanical Processing Technology” within the Comprehensive Research Direction 8: Light, Strong, Corrosion-Resistant Weldable Alloys and Steels, Including Those with a High Fracture Toughness (“Strategic Directions of Development of Materials and Technology of Their Processing through the Year 2030”) [31].

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Authors and Affiliations

  1. All-Russian Scientific Research Institute of Aviation Materials (VIAM), 105005, Moscow, Russia

    O. S. Kashapov, T. V. Pavlova & V. S. Kalashnikov

  2. Samara National Research University, 443086, Samara, Russia

    I. P. Popov

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  1. O. S. Kashapov
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  2. T. V. Pavlova
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  3. V. S. Kalashnikov
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  4. I. P. Popov
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Correspondence to O. S. Kashapov.

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Translated by S. Semenova

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Kashapov, O.S., Pavlova, T.V., Kalashnikov, V.S. et al. Effect of Carbon Additives on the Mechanical Properties of a Titanium Near-α Alloy. Inorg. Mater. Appl. Res. 11, 1291–1298 (2020). https://doi.org/10.1134/S2075113320060088

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  • DOI: https://doi.org/10.1134/S2075113320060088

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