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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50756

Title: Fatigue crack growth behavior of laser-processed 304 stainless steel in air and gaseous hydrogen
Authors: L.W.Tsay
M.C.Young
C.Chen
Contributors: 國立臺灣海洋大學:材料工程研究所
Keywords: AISI 304 stainless steel
Fatigue crack growth
Twin boundary separation
Quasi-cleavage fracture
Martensite
Date: 2003-09
Issue Date: 2018-10-22T08:53:19Z
Publisher: Corroison Science
Abstract: Abstract: Fatigue crack growth test was performed to evaluate fatigue behavior of 304 stainless steel specimens with or without laser processing (welding and surface treatment) in air and gaseous hydrogen. As the crack propagation normal to the laser welding or scan direction, the laser-processed specimens exhibited a higher resistance to crack growth in the low stress intensity factor range (ΔK) than the as-received steel plates regardless of testing environments. However, the marked retardation of crack growth behavior vanished for welded specimens subjected to a 850 °C/h stress relief treatment or with a shorter distance from notch tip to the weld centerline in the test.

Fatigue-fractured appearance of the steel plate tested in air was composed of mainly transgranular fatigue fracture and some flat facets, along with a small amount of intergranular fracture. While quasi-cleavage fracture and few twin boundary separations were observed for the same specimen in hydrogen. On the other hand, the lower crack growth rate of laser-processed specimens in both air and hydrogen was accompanied with rubbed areas on the fracture surfaces. It was found that the extent of quasi-cleavage fracture was related to the formation of strain-induced martensite, which would contribute to an increased fatigue crack growth rate of all specimens in gaseous hydrogen.
Relation: 45(9) pp.1985-1997
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50756
Appears in Collections:[材料工程研究所] 期刊論文

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