Fatigue crack growth of electron beam melted TI-6AL-4V in high-pressure hydrogen
Journal article, 2020

Titanium-based alloys are susceptible to hydrogen embrittlement (HE), a phenomenon that deteriorates fatigue properties. Ti-6Al-4V is the most widely used titanium alloy and the effect of hydrogen embrittlement on fatigue crack growth (FCG) was investigated by carrying out crack propagation tests in air and high-pressure H2 environment. The FCG test in hydrogen environment resulted in a drastic increase in crack growth rate at a certain DK, with crack propagation rates up to 13 times higher than those observed in air. Possible reasons for such behavior were discussed in this paper. The relationship between FCG results in high-pressure H2 environment and microstructure was investigated by comparison with already published results of cast and forged Ti-6Al-4V. Coarser microstructure was found to be more sensitive to HE. Moreover, the electron beam melting (EBM) materials experienced a crack growth acceleration in-between that of cast and wrought Ti-6Al-4V.

Electron beam melting (EBM)

Fatigue crack growth (FCG)

Hydrogen embrittlement (HE)

Ti-6Al-4V

Author

M. Neikter

University West

Luleå University of Technology

Magnus Hörnqvist Colliander

Chalmers, Physics, Materials Microstructure

C. de Andrade Schwerz

GKN Aerospace

T. Hansson

University West

GKN Aerospace

Pia Åkerfeldt

Luleå University of Technology

Robert Pederson

University West

Marta-Lena Antti

Luleå University of Technology

Materials

1996-1944 (ISSN)

Vol. 13 6 1287

Subject Categories

Applied Mechanics

Other Materials Engineering

Metallurgy and Metallic Materials

DOI

10.3390/ma13061287

More information

Latest update

5/19/2020