The Effect of Hydrogen on Fatigue Properties of Metals used for Fuel Cell System |
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Authors: | Y Murakami |
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Affiliation: | (1) Department of Mechanical Engineering Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan |
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Abstract: | The effect of hydrogen on the fatigue properties of alloys which are used in fuel cell (FC) systems has been investigated.
In a typical FC system, various alloys are used in hydrogen environments and are subjected to cyclic loading due to pressurization,
mechanical vibrations, etc. The materials investigated were three austenitic stainless steels (SUS304, SUS316 and SUS316L),
one ferritic stainless steel (SUS405), one martensitic stainless steel (0.7C-13Cr), a Cr-Mo martensitic steel (SCM435) and
two annealed medium-carbon steels (0.47 and 0.45%C). In order to simulate the pick-up of hydrogen in service, the specimens
were charged with hydrogen. The fatigue crack growth behaviour of charged specimens of SUS304, SUS316, SUS316L and SUS405
was compared with that of specimens which had not been hydrogen-charged. The comparison showed that there was a degradation
in fatigue crack growth resistance due to hydrogen in the case of SUS304 and SUS316 austenitic stainless steels. However,
SUS316L and SUS405 showed little degradation due to hydrogen. A marked increase in the amount of martensitic transformation
occurred in the hydrogen-charged SUS304 specimens compared to specimens without hydrogen charge. In case of SUS316L, little
martensitic transformation occurred in either specimens with and without hydrogen charge. The results of S-N testing showed that in the case of the 0.7C–13Cr stainless steel and the Cr–Mo steel a marked decrease in fatigue resistance
due to hydrogen occurred. In the case of the medium carbon steels hydrogen did not cause a reduction in fatigue behaviour.
Examination of the slip band characteristics of a number of the alloys showed that slip was more localized in the case of
hydrogen-charged specimens. Thus, it is presumed that a synergetic effect of hydrogen and martensitic structure enhances degradation
of fatigue crack resistance. |
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Keywords: | Crack growth Cr-Mo steel ductility loss fatigue hydrogen medium carbon steel stainless steel slip behaviour |
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