TI-6AL-4V ALLOY FABRICATED BY LASER DIRECT DEPOSITION: DYNAMIC MECHANICAL PROPERTIES, CONSTITUTIVE MODEL, AND NUMERICAL SIMULATION

Tao Wang, Weilin Qiao (), Sheng Wang (), Zhan Li (), Hao Wang () and Jianbo Lei ()
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Tao Wang: Department of Mechanical Engineering, Civil Aviation University of China, Tianjin 300300, P. R. China
Weilin Qiao: Department of Mechanical Engineering, Civil Aviation University of China, Tianjin 300300, P. R. China
Sheng Wang: Department of Mechanical Engineering, Civil Aviation University of China, Tianjin 300300, P. R. China
Zhan Li: Department of Mechanical Engineering, Civil Aviation University of China, Tianjin 300300, P. R. China
Hao Wang: CETO, Civil Aviation University of China, Tianjin 300300, P. R. China
Jianbo Lei: Research Center of Laser Technology, Tianjin Polytechnic University, Tianjin 300387, P. R. China

Surface Review and Letters (SRL), 2020, vol. 27, issue 08, 1-12

Abstract: The dynamic mechanical properties of Ti-6Al-4V alloy prepared by laser direct deposition (LDD) at different strain rates are of great significance for the application of LDD technology in the manufacture and repair of aero-engine parts. The quasi-static tensile test and dynamic compression test of Ti-6Al-4V alloy prepared by LDD (LDD-Ti-6Al-4V) were carried out under the quasi-static and high strain rate using INSTRON-5982 tensile test equipment and Split Hopkinson pressure bar (SHPB) equipment. The true stress–strain curve is obtained, which indicates that the LDD-Ti-6Al-4V has a strain rate strengthening effect. Moreover, the Johnson–Cook (J–C) constitutive model of LDD-Ti-6Al-4V was fitted based on experimental data, and the experimental process of SHPB was numerically simulated. The simulation results are basically the same as the experimental results, which proves the correctness of the J–C constitutive model of LDD-Ti-6Al-4V.

Keywords: Laser direct deposition; Ti-6Al-4V; dynamic mechanical properties; SHPB; Johnson–Cook constitutive model; numerical simulation (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19501919

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