Microstructure and Properties of TA15 Titanium Alloy Fabricated with Laser Treatment and Heat Treatment
Yu-Hang Wang a, Peng-Fei Li b, Jun Yin c, Xiao-Dan Li c, Jia-Cheng Wu d, Yu-Chun Peng d and Hao Wang e
aGraduate Student, School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, PR China
bAssociate Professor, School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, PR China.
cSenior Engineer, Process Research Institute, Shenyang Aircraft Corporation, Shenyang 110000, China.
dGraduate Student, School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, PR China
eAssociate Professor, Shanghai Engineering Research Center of Laser Intelligent Manufacturing, Shanghai Institute of Laser Technology Co.,Ltd., Shanghai 200233, China.
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Abstract:
In this study, the microstructure evolution of
TA15 titanium alloy and its effect on the material
properties were investigated by laser quenching and
traditional heat treatment. Through the systematic
evaluation of three different heat treatment processes,
it is revealed that heat treatment has significant
effects on the microstructure, element distribution,
microhardness and tensile properties of the alloy. The
results show that the 780°C quenching treatment does
not improve the tensile properties of the alloy, but
causes a slight decrease in the ultimate tensile
strength, yield strength and maximum elongation,
which is closely related to the change of internal
structure. Laser quenching formed a hardened layer
about 20μm thick on the surface of the sample, which
increased the surface hardness but negatively affected
the elongation and yield strength of the material.
Comparatively speaking, the ultimate tensile strength
and yield strength of the alloy are significantly
enhanced by the aging treatment at 500°C, although
at the expense of a certain maximum elongation. By
X-ray diffraction (XRD) and X-ray photoelectron
spectroscopy (XPS) analysis, the surface and
microstructure changes of the samples after different
heat treatments were further confirmed.
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