Abstract
Microcrack propagation behavior of Mod.9Cr-1Mo steel under high-temperature fatigue in vacuum and air conditions were periodically observed. Microcracks propagated in the direction normal to stress axis in vacuum while the microcracks propagated in the maximum shear direction in air condition. It was found that propagation rate in air was faster than that in vacuum until the crack grew 1 mm length due to oxidation effect which was insignificant for the crack larger than 1 mm. Acceleration of the crack propagation rate in the compression hold test was supposed to be caused by accumulation of tensile strain in the center of the specimen due to off-balance of strain distribution between tension and compression side.
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