Abstract
Creep rupture behavior of Grade 91 heat-resistant martensitic steel under multiaxial state of stress was investigated. Creep tests were conducted at 923K with stress ranging from 125 to 200MPa. The notch root radii (r) of doubled circumferentially U-notched specimens is 0.6 mm. The test results show that the creep rupture life of Grade 91 steel decreases with the increasing of applied stress. The creep rupture behavior was investigated based on the scanning electron microscope and optical microscope analysis.
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