约束氢致密化处理对粉末冶金Ti-6Al-4V合金致密度与力学性能的影响

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

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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

Received: 30 November 2021 Published: 07 May 2022

ZTFLH:

TG146.23

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	DUAN Zhongyuan
	CHEN Zoujun
	ZHU Xianzhi
	LIU Bin
	LIU Yong
	LIANG Xiaopeng
	ZHOU Chengshang

Cite this article:

DUAN Zhongyuan,CHEN Zoujun,ZHU Xianzhi, et al. 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.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2021104 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I2/171

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