氢对TC4ELI钛合金焊接接头组织和性能的影响

doi:10.7527/S1000-6893.2024.31439

Abstract

Abstract:

TC4ELI titanium alloy has a great application prospect in hydrogen fuel engine， but there is a risk of hydrogen damage in the welded structure of hydrogen-related components. The tensile， fatigue and nanoindentation test pieces of welded TC4ELI with 0.2% hydrogen were obtained by electron beam welding and high temperature gas charging of hydrogen. Combined with X-ray diffraction， secondary ion mass spectrometry and other microscopic characterization methods， mechanical tests such as nanoindentation and low-cycle fatigue tests were carried out to deeply investigate the influence of hydrogen on the microstructure and mechanical properties of TC4ELI welded joints. The results show that hydrogen charging can promote the transformation of α phase into β phase and precipitate δ hydride in each zone of TC4ELI welded joints. More hydride precipitated in the weld metal， and the corresponding elastic modulus and hardness decreased the most， resulting in uniform microstructure and properties of welded joints. The elastic modulus and fracture strain of TC4ELI welded joints decreased significantly after hydrogen charging， and the fracture mode changed from transgranular dimple fracture to intergranular brittle fracture due to the influence of hydride. The low-cycle fatigue life of hydrogen-charged TC4ELI is significantly reduced due to stress-induced hydride cracking at low stress level； however， at high stress level， due to hydrogen-induced local plasticity， it exhibits better fatigue resistance.

Key words: TC4ELI titanium alloy, electron beam welding, hydrogen damage, microstructure, mechanical properties, nanoindentation

CLC Number:

V252.2

Riming YANG, Xiuli SHEN, Shaojing DONG. Influence of hydrogen on microstructure and mechanical properties of TC4ELI titanium alloy welded joints[J]. Acta Aeronautica et Astronautica Sinica, 2025, 46(15): 431439.

Figures/Tables 17

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References 27

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材料	含量/wt%
材料	Ti	Al	V	Fe	C	N	O
TC4ELI	Bal.	6.12	4.21	0.125	0.016	0.015	0.095
标准TC4	Bal.	5.5~6.8	3.5~4.5	≤0.30	≤0.10	≤0.05	≤0.20

区域	含量/wt%			相
区域	Ti	Al	V	相
点扫谱1	91.67	5.96	2.36	α
点扫谱2	91.83	5.92	2.25	α
点扫谱3	91.99	5.84	2.17	α
点扫谱4	91.55	5.81	2.63	α
点扫谱5	90.97	6.06	2.96	α
点扫谱6	86.54	4.71	8.75	β
点扫谱7	86.09	4.53	9.38	β
点扫谱8	87.01	4.48	8.51	β
点扫谱9	87.51	4.43	8.05	β
点扫谱10	86.53	4.44	9.03	β

区域	β相V含量平均值/wt%	下降比例/%
未充氢WM	8.74
未充氢HAZ	14.56
未充氢BM	15.72
充氢WM	6.00	31.4
充氢HAZ	6.79	53.4
充氢BM	6.85	56.4

区域	H^-		TH^-
区域	Cts	Max	Cts	Max
未充氢WM	103 995	12	1 703	2
未充氢HAZ	51 024	9	723	3
未充氢BM	72 554	12	1 592	3
充氢WM	374 512	19	9 278	4
充氢HAZ	314 016	18	7 480	4
充氢BM	317 732	19	7 891	4

Influence of hydrogen on microstructure and mechanical properties of TC4ELI titanium alloy welded joints

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