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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/23654

Title: Effect of austenite instability on the hydrogen-enhanced crack growth of austenitic stainless steels
Authors: L.W. Tsay;S.C. Yu;R.-T. Huang
Contributors: NTOU:Institute of Materials Engineering
Keywords: A. Austenitic stainless steel;C. Hydrogen embrittlement;C. Fatigue crack growth
Date: 2007-07
Issue Date: 2011-10-20T08:07:00Z
Publisher: Corrosion Science
Abstract: Abstract:Fatigue crack growth tests were performed to assess the fatigue behavior of AISI 316L and 254 SMO stainless steels (SSs) in air and gaseous hydrogen. 254 SMO SS generally exhibited a greater resistance to fatigue crack growth than 316L. Sensitization treatment had only a marginal effect on the fatigue crack growth behavior of both alloys in air. Moreover, 316L SS exhibited significant hydrogen-enhanced crack growth but 254 SMO, even sensitized 254 SMO specimens, did not. A thin layer of strain-induced martensite was formed on the fatigue-fractured surface of the 316L SS, and its content increased when raising the stress ratio. The thin martensite layer was responsible for the hydrogen-enhanced fatigue crack growth of the 316L SS. By contrast, the extremely stable austenite was responsible for the low susceptibility of 254 SMO SS to hydrogen-accelerated crack growth. The trapping of hydrogen at the grain boundaries and the transformed martensite in the sensitized 316L specimens led to increased fatigue crack growth rates and intergranular fracture of the material.
Relation: 49(7), pp.2973-2984
URI: http://ntour.ntou.edu.tw/handle/987654321/23654
Appears in Collections:[材料工程研究所] 期刊論文

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