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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50775

Title: Effect of hydrogen environment on the notched tensile properties of T-250 maraging steel annealed by laser treatment
Authors: L.W Tsay
W.C Lee
W.C Luu
J.K Wu
Contributors: 國立臺灣海洋大學:材料工程研究所
Keywords: Maraging steel
Hydrogen embrittlement (C)
Laser-annealed zone
Notched tensile strength
Hydrogen permeation (C)
Date: 2002-06
Issue Date: 2018-10-23T07:41:48Z
Publisher: Corrosion Science
Abstract: Abstract: In the present work, slow displacement rate tensile tests were performed to find out the influence of ageing condition and hydrogen-charging on the notched tensile strength and fracture characteristics of T-250 maraging steel aged at various conditions. The influence of embrittling species in the environment on the notched tensile strength was accessed by comparing the measured properties in air, gaseous hydrogen and H2S-saturated solution. The hydrogen diffusivity, permeation flux and apparent solubility of various specimens determined by electrochemical permeation method, were correlated well with the microstructures and mechanical property. The results indicated that the peak-aged (H900) specimen was highly sensitive to hydrogen embrittlement even in gaseous hydrogen. In contrast, the microstructures of over-aged (H1100) specimen comprising of reverted austenite and incoherent precipitates could trap large amount of hydrogen atoms, resulting in decreased hydrogen permeability and hydrogen embrittlement susceptibility. The solution-annealed specimen had the highest diffusion coefficient and the lowest quantity of trapped hydrogen among the specimens, showing high susceptibility to sulfide stress corrosion cracking. In the presence of notches, hydrogen atoms were prone to segregate and trap at grain boundaries, resulting in the formation of intergranular fracture.
Relation: 44(6) pp.1311-1327
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50775
Appears in Collections:[材料工程研究所] 期刊論文

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