Analysis of the hydrogen absorption and its influence on mechanical behaviour of five iron alloys
DOI:
https://doi.org/10.3989/revmetalm.2008.v44.i2.100Keywords:
Cathodic charging, Hydrogen, Mechanical property, Glow discharge optical emission spectroscopy, Steels, Cast ironsAbstract
A study of the influence of hydrogen on the mechanical behaviour of five iron alloys with different carbon state, morphology and content (as spheroidal or lamellar graphite or combined as CFe3) is described here. Experimental observations from tensile (carried out at different crosshead speeds), Charpy impact resistance, hardness, fracture toughness tests and fractographic analysis show that internal or dissolved hydrogen, apart from producing a significant loss of ductility, hardens steels and softens cast irons. The results also provide convincing evidence of the important role that the strain rate plays in the mechanism of hydrogen induced cracking. Additionally, glow discharge optical emission spectroscopy (GDOES) technique is used to evaluate the concentration of hydrogen that has been absorbed by the samples as a function of depth and time. It can be deduced from the innovative use of this technique not only that diffusivity of hydrogen in ductile cast irons is greater than in steels or grey cast irons, but also that hydrogen interacts with different trapping sites.
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