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Research on Hot Deformation Microstructure Evolution of Titanium Alloy TB6

Author: QiuWei
Tutor: LuShiQiang
School: Nanchang University of Aeronautics and
Course: Materials Processing Engineering
Keywords: TB6 titanium alloy Flow stress Microstructure Dynamic recrystallization
CLC: TG146.23
Type: Master's thesis
Year: 2010
Downloads: 253
Quote: 1
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Abstract


TB6 titanium alloy is a near-β titanium alloy with a high specific strength, good fracture toughness, deep hardenability characteristics, suitable for the manufacture of high-strength and high-toughness aviation forgings. For TB6 titanium alloy microstructure evolution of hot deformation behavior of β single-phase region, is relatively scarce. In this paper, the cast and wrought-state two states TB6 titanium alloy as the main object of study, and other temperature and constant strain rate compression tests to study the law of the deformation behavior and microstructure evolution of the alloy in the β forging process. On this basis, build TB6 titanium alloy dynamic recrystallization prediction model. This guidance TB6 titanium alloy forging production, and extensive experience in senior wrong can metal dynamic recrystallization theory has important theoretical significance and practical value. The main findings are as follows: cast TB6 titanium alloy forging state stress - strain curve was liquidity shocks and flow softening features of both. TB6 titanium alloy flow stress of the two initial organizations are subject to more significant influence of strain rate; distortion temperature of the alloy flow stress at higher strain rate lower strain rate is small. Cast TB6 titanium alloy in the strain rate is greater than the 0.001s-1, all deformation temperature dynamic recrystallization are underdeveloped; When the strain rate of 0.001s-1 and deformation temperature greater than 1050 ° C, dynamic the crystallization development more fully. Forging state TB6 titanium alloy deformation temperature of 800 ℃ ~ 950 ℃, the grain size has been refined, small volume fraction of recrystallization; dynamic recrystallization more fully in the 950 ℃ ~ 1150 ℃, corresponding tissue uniformity be improved, but the temperature exceeds 1050 ° C, grains overly grow, alloy roughened serious. The strain rate increases grain refinement and dynamic recrystallization volume fraction decreases leaving the non-uniform grain size increased, but the strain rate is too low, the grain will be too grown up leaving the organization coarsening . Based on experimental data and quantitative measurement data for thermal compression, calculated cast TB6 titanium alloy forging state average deformation activation energy: Q1 = 217.5 kJ / mol, Q2 = 194.2 kJ / mol. Cast TB6 titanium alloy and dynamic recrystallization critical strain model and forging state TB6 titanium alloy dynamic recrystallization critical strain model, the model of the volume fraction and the grain size model. Considering organizational homogeneity and grain refinement angle, forging state TB6 alloy thermal parameters to the strain rate of 0.01 s-1, the deformation temperature of 950 ℃ ~ 1050 ℃ appropriate; cast TB6 titanium alloy small uniform tissue strain rate should 0.001s-1 and the optimum temperature range of not more than of 1050 ° ~~ 1150 ° C.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Titanium
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