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Materials Science and Engineering of Powder Metallurgy >

2022 , Vol. 27 >Issue 2: 171 - 179

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2021104

Engineering and Technology

Effects of confined hydrogen densification treatment on the density and mechanical properties of powder metallurgy Ti-6Al-4V alloy

  • DUAN Zhongyuan ,
  • CHEN Zoujun ,
  • ZHU Xianzhi ,
  • LIU Bin ,
  • LIU Yong ,
  • LIANG Xiaopeng ,
  • ZHOU Chengshang
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  • 1. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China;
    2. School of Materials Science and Engineering, Central South University, Changsha 410083, China

Received date: 2021-11-30

  Revised date: 2022-01-04

  Online published: 2022-03-05

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Abstract

Titanium hydride powder and 6Al-4V pre-alloyed powder were used as raw materials to prepare Ti-6Al-4V alloy by vacuum sintering. Then confined hydrogen densification treatment in a high-purity hydrogen atmosphere was carried out, and finally vacuum annealing was performed to remove the residual hydrogen in the alloy. The microstructure morphology of the alloy was observed by an optical microscope. The density and tensile properties of the alloy were determine, and the fatigue performance testing was tested using the MTS-810 hydraulic servo fatigue testing machine . The results show that the confined hydrogen densification treatment can reduce the residual porosity of the sintered Ti-6Al-4V alloy from 2.5% to 1.3%, and the relative density can reach (98.7±0.3)%. After confined hydrogen densification treatment, the tensile strength of the alloy increases from (936±18) MPa to (959±10) MPa, and the elongation increases from (6.7±1.6)% to (12±1.1)%. At the same time, the fatigue performance is improved, and the cycle times reach 4670 cycles under the condition of 0.5% cyclic strain amplitude.

Key words： titanium alloy; confined hydrogen densification; residual porosity; microstructure; low cycle fatigue

Cite this article

DUAN Zhongyuan , CHEN Zoujun , ZHU Xianzhi , LIU Bin , LIU Yong , LIANG Xiaopeng , ZHOU Chengshang . Effects of confined hydrogen densification treatment on the density and mechanical properties of powder metallurgy Ti-6Al-4V alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2022 , 27(2) : 171 -179 . DOI: 10.19976/j.cnki.43-1448/TF.2021104

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