ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In order to investigate the hydrogen effect on fatigue crack growth (FCG) behavior in a fewkinds of practical alloys; austenitic stainless steels (solution-treated metastable type 304 and stabletype 316L), an aluminum alloy (age-hardened 6061) and a low carbon steel (annealed 0.13%C-Fe),FCG tests were carried out in hydrogen gas and in nitrogen gas. The FCG rates of these materials areenhanced by hydrogen, though the acceleration degrees are different. A crack grows across grains byslip-off in 316L stainless steel and in age-hardened 6061 aluminum alloys even in hydrogen. Facetedarea increases in 304 stainless steel and in low carbon steel in hydrogen. In 304 stainless steel, theratio of facets to the entire fracture surface was not so large. Thus, the FCG rate is not significantlyaffected through the facets in 304 stainless steel. In low carbon steel, facets were increasedconsiderably, though a crack grows step by step or after a large number of loading cycles even alonggrain boundaries. Anyhow hydrogen enhances the FCG rate of these materials through the influenceon slip behavior. Based on above-mentioned results, the effect of loading frequency on FCG rate inhydrogen of the age-hardened 6061 aluminum alloy was also investigated. The FCG rate increases asthe testing frequency decreases, though the FCG rate in hydrogen shows the tendency to saturate
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.329.pdf
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