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Studies Of Creep Damage In The Heat-Affected Zone Of 9cr-1mo-Vnb Steel Weldments, John William Bohling
Studies Of Creep Damage In The Heat-Affected Zone Of 9cr-1mo-Vnb Steel Weldments, John William Bohling
Doctoral Dissertations
Creep strength enhanced ferritic (CSEF) steels are used in power plants for high temperature, pressure-containing welded components such as steam headers. One CSEF steel, 9Cr-1Mo-VNb or Grade 91, often exhibits localized creep deformation and cavitation in the weld heat-affected zone (HAZ), identified as Type IV creep damage. Three Grade 91 weldments were evaluated by creep testing and microstructural characterization using optical and scanning electron microscopy, combined with image analysis, to investigate microstructure evolution and creep damage. Two weldments fabricated from dissimilar base metals were used for direct comparison of creep damage in two materials simultaneously during cross-weld testing. Longitudinal creep …