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Simulation Study of Al-5.5Cu-0.3Mg Alloy During Multi-pass Hot Compression Process

Author: ChenJinZe
Tutor: LinQiQuan
School: Xiangtan University
Course: Materials Processing Engineering
Keywords: Al - Cu -Mg alloy Multi-pass hot compression Simulation Study DEFORM Secondary development
CLC: TG146.21
Type: Master's thesis
Year: 2011
Downloads: 77
Quote: 1
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Abstract


High Cu / Mg ratio (Cu / Mg ≥ 8) of the Al-Cu-Mg alloy is heat strengthened aluminum alloy with excellent mechanical properties, ballistic resistance, weldability and resistance to stress corrosion, the rolled plate has been applied in aviation, aerospace, military and other fields. With the continuous upgrading of the product, the product performance requirements are also getting higher and higher, it is necessary to optimize the production process. In order to optimize the rolling process parameters to obtain good performance rolling, that type of alloy multi-pass heat distortion deformation behavior and microstructural evolution of great significance. In this paper, the Gleeble 1500 thermal simulation machine axisymmetric compression, the Al-5.5Cu-0.3Mg alloy cylindrical specimens of the alloy in the multi-channel thermal compression process flow stress behavior. Data regression analysis of the thermal deformation of the alloy material constants and flow stress constitutive equation; softening method, double-inferior temperature compression experimental flow curves are calculated, the Al-5.5Cu-0.3Mg alloy hot-rolled recrystallization kinetics model; In addition, we designed four different experimental program, the alloy four thermal compression simulation, collected four times hot compression flow curves, obtained different options softening between passes. Experimental results show that the programs softening rate increases with increasing passes; softening rate gradually increased as the initial deformation temperature rises. The use of the means of the metallurgical, transmission electron microscopy and hardness testing, hot compression deformation of the specimen microstructure and mechanical properties were analyzed. The results show that: the alloy the first deformation process, not dynamic recrystallization; while in the second pass and subsequent deformation process, part of the dynamic recrystallization; specimen occurs four times the deformation process static recrystallization; hardness values ??increasing as the deformation ending temperature rises. The constitutive equations obtained by introducing hot deformation, recrystallization mathematical models, as well as the use of FORTRAN DEFORM-2D finite element software secondary development, the Al-5.5Cu-0.3Mg alloy multi-channel thermal compression process heat - force - organization coupled analysis. Stress, simulation results show that: the equivalent strain, equivalent strain rate, uneven deformation temperature, the core section of the sample, and the value in the vicinity of the diagonal positions is significantly higher than the other location; recrystallization of the central portion of the sample percentage BET near recrystallization percent; entire sample recrystallization percentage gradually increased with increasing deformation passes.

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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 > Aluminum
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