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Study on Hot Deformation Behaviors and Optimization of Process Parameters for Titaniumalloy of Forging TB6

Author: WuLin
Tutor: WangKeLu
School: Nanchang University of Aeronautics and
Course: Materials Processing Engineering
Keywords: TB6 titanium alloy Microstructure Deformation mechanism Processing map Process optimization
CLC: TG319
Type: Master's thesis
Year: 2010
Downloads: 190
Quote: 0
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Abstract


TB6 titanium alloy near-β titanium alloy characterized by high strength, high toughness, high hardenability, etc., are widely used in the fields of aviation and aerospace. The alloy embarrass deformed material, its organization and performance of thermodynamic parameters are very sensitive to deformation, not easy to guarantee access to the actual production process organization and consistent performance. TB6 titanium alloy forging state isothermal constant strain rate compression tests to study the thermal deformation behavior and the use of the alloy thermal process parameters were optimized based on the processing of dynamic material model Figure technology, research results on the rational development and optimization TB6 titanium alloy thermal processing parameters have important theoretical significance and practical value. The main contents are as follows: the thermal simulation machine Themecmater-Z, of forging state TB6 titanium alloy deformation temperature of 800 1 150 ° C and strain rate of 0.001 1 0 s -1 , the maximum reduction of 60% forging state TB6 titanium alloy isothermal constant strain rate compression test, and draw out the true stress under different temperatures and different strain rates - true strain curve. Curve analysis can be seen that the flow stress during hot deformation temperature and strain rate sensitivity is relatively high flow stress with lower strain temperature and strain rate, a downward trend. Dynamic material model theory and Prasad criterion, such as temperature and constant strain rate compression test data, draw out under different strain forging state TB6 titanium alloy processing map. Analysis processing map, combined with the observation of the microstructure analysis of the mechanism of the microstructure of the of forging state TB6 instability area. The results show that: the distortion temperature of 800 8 75 ° C, the strain rate range of 0.1 1 0s -1 adiabatic shear and local plastic flow; deformation temperature range 875 1 150 ℃, strain rate range of 0.18 1 0s -1 mechanical instability. More suitable range of thermal processing parameters can determine by analyzing the processing map, combined with the observation of the microstructure of three, were: ① deformation temperature of 835 8 80 ° C, the strain rate of 0.001 .01 s -1 ; ② distortion temperature of 975 1 030 ° C and strain rate of 0.0016 0 .032 s - 1 ; ③ deformation temperature of 1130 1 150 ° C and a strain rate of 0.001 0 .0312 s -1 , deformation mechanism for dynamic recrystallization.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Forging, forging and blacksmith > Non-ferrous metal forging
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