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Temperature-dependent effect of deformation on microstructure and properties of TC4 titanium alloy
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Affiliation:

1.Jiangsu Key Laboratory of Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University;2.Jiangsu Tiangong Technology Co,Ltd

Clc Number:

TG146.4

Fund Project:

National Natural Science Foundation of China (No.51301038),Key R&D Program Funding of Zhengjiang(GZ2017011)

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    Abstract:

    In this paper, the effect of deformation temperature on the evolution of microstructure and properties of TC4 alloy has been studied by a constant-strain rate tensile test at high temperature. The results show that both the peak stress and required strain of peak stress decrease with increasing temperature in a α+β dual-phase field. The deformed microstructure exhibits a strong temperature-dependent evolution with temperature. Deformation leads to an accelarated recrystallization and refinement of primary α phase at a lower temperature of α+β phase field (below 900 °C), whereas results in a significant spheroidization of secondary α phase at a higher temperature (above 900 °C). Additionally, deformation also affects the nucleation and growth process of β→α transformation, resulting in a larger amount of secondary α phase. With increasing deformation temperature, the volume fraction of α phase firstly decreases and then increases, which shows a good consistence with hardness. However, the corrosion resistance displays a reverse evolution with the amount of α phase. TC4 alloy exhibits a lowest volume fraction of α phase of 57% at a deformation temperature of 900 °C, which corresponds to a lowest hardness and a best corrosion resistance in a NaCl solution.

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[Li Xumin, Fang Feng, Jiang Jianqing, Zhou Xuefeng, Hou Yuxin. Temperature-dependent effect of deformation on microstructure and properties of TC4 titanium alloy[J]. Rare Metal Materials and Engineering,2019,48(10):3379~3386.]
DOI:10.12442/j. issn.1002-185X.20180626

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History
  • Received:June 14,2018
  • Revised:July 20,2018
  • Adopted:August 30,2018
  • Online: November 01,2019
  • Published: