Conclusion
An increase in the ultimate breaking strength, stress-rupture strength, and fatigue limit of alloy VT3-1 with a lamellar structure may be achieved as a result of refining any parameter of the structure, particularly α-phase platelet thickness, and increasing the volume fraction of secondary α-phase. An increase in ductility characteristics, toughness, and creep resistance may be provided by increasing the dimensions of α-colonies and primary α-phase particles (up to 2.5–3.5 μm) and reducing the volume fraction and dispersivity of secondary α-phase lamellar precipitates. Coarsening of β-grains leads to an increase in ac, kQ, and refinement leads to an increase in ψ and an.
Qualitative dependences for mechanical properties of alloy VT3-1 on lamellar structure parameters made it possible to isolate those structural parameters which have the most marked effect on properties.
The properties of alloys with a finely lamellar structure (d≤25 μm, bαI, αII<2 μm) are most sensitive to structure. In this case a change in α-colony size by 10 μm and α-platelet thickness by 1 μm affects the properties 3–20 times more strongly than a change in β-grain size by 100 μm. The effect of finely dispersed secondary α-phase precipitates is greater, the coarser the primary α-phase structure. Refinement of primary α-phase structure with an increase in secondary phase platelet thickness to 1 μm or more reduces the sensitivity of alloy mechanical properties to the effect of secondary α-phase.
With coarsening of the intragranular structure (d>25 μm, bαI, αII≥2 μm) the effect of structural parameters d and b on properties is markedly weakened: on strength properties (σf, σ 450100 ) by a factor of 100, on ductility (σ, ψ), by a factor of 10 to 20, and on impact strength and fracture toughness (an, ac, KQ) by a factor of five.
The qualitative relationships obtained between structure and mechanical properties of alloy VT3-1 are fundamental for controlling the structure of semifinished titanium alloy products.
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Literature cited
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 52–55, July, 1986.
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Brun, M.Y., Shakhanova, G.V. & Soldatenko, I.V. Effect of lamellar structure parameters on the properties of titanium alloy VT3-1. Met Sci Heat Treat 28, 519–522 (1986). https://doi.org/10.1007/BF00780646
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DOI: https://doi.org/10.1007/BF00780646