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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50750

Title: Fatigue crack growth behavior of laser-annealed IN 718 alloy in hydrogen
Authors: L.W.Tsay
Contributors: 國立臺灣海洋大學:材料工程研究所
Keywords: IN 718
Hydrogen-enhanced crack growth
Laser-annealed treatment
Date: 2004-11
Issue Date: 2018-10-22T08:23:44Z
Publisher: Corrosion Science
Abstract: Abstract: The effect of hydrogen embrittlement on the fatigue crack growth of IN 718 plate and laser-annealed specimens in hydrogen containing environment were investigated. Although the differences in tensile strength and impact toughness between solution-annealed (S) and aged (A) IN 718 specimens were significant, the experimental results indicated that both specimens within the low ΔK regime exhibited a similar fatigue behavior. As the ΔK increased above 30 MPa m , the solution-annealed specimen revealed a higher fatigue crack growth rate (FCGR) than the aged one. In general, the IN 718 alloy had a low sensitivity to hydrogen-enhanced fatigue crack growth, independent of hydrogen sources. Residual compressive stresses ahead of the crack tip were responsible for the improved resistance to fatigue crack growth in a laser-annealed specimen. For alloys with similar strength, IN 718 alloy trapped a huge amount of hydrogen in the matrix showing a less susceptibility to hydrogen-enhanced fatigue crack growth in comparison with the maraging steel. Additionally, fatigue-fractured appearance near crack initiation sites reveals quasi-cleavage fracture in embrittled specimens.
Relation: 46(11) pp.2651-2662
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50750
Appears in Collections:[材料工程研究所] 期刊論文

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