Analysis of Hydrogen Behavior in Sustained-Load Crack Growth of Lamellar TiAl by Means of Hydrogen Microprint Technique
Masakazu YOSHIOKA, Akira UENO and Hidehiro KISHIMOTO
Abstract:The hydrogen microprint technique is one of the candidate method for visualizing hydrogen in metallic materials. We can visualize the hydrogen in metal using the silver reduced by the hydrogen. In the present study, the hydrogen behavior in sustained-load crack growth of a lamellar TiAl intermetallic compounds has been studied by means of hydrogen microprint technique. The crack growth was accelerated by the hydrogen. The hydrogen accumulated region was well visualized by the hydrogen microprint technique. It was proven that large amount of hydrogen was accumulated in the high stress field at the crack tip. The hydrogen content at the crack tip depended on the crack arresting time. Also it was confirmed that hydrogen content was dependent on the hydrostatic stress. Key Words:Hydrogen, Hydrogen embrittlement, Crack growth, Hydrogen microprint technique, TiAl, Intermetallic compound