【摘 要】
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Ni-base superalloys are widely used to manufacture blades and vanes in aerospace and power generation industries due to their excellent balance of creep and
【机 构】
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TokyoInstituteofTechnologyOokayama2-12-1,Meguro-ku,Tokyo,Japan,152-8552
【出 处】
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第五届先进材料与结构的力学中日双边学术研讨会(The 5th Joint-Symposium on Mechanics
论文部分内容阅读
Ni-base superalloys are widely used to manufacture blades and vanes in aerospace and power generation industries due to their excellent balance of creep and fatigue resistance at elevated temperature.In this study,fatigue crack initiation and propagation in single crystal and polycrystalline Ni-base superalloys were experimentally investigated at room temperature,450℃ and 700℃,employing originally designed miniature specimens.At first,effects of crystallographic orientation on crack propagation were investigated,using a single crystal(SC)Ni-base superalloy with different combinations of primary and secondary orientations.Based on the test result of the SC superalloy,influences of grain orientations and grain boundary on crack propagation were investigated employing a specially prepared by-crystal(BC)superalloy and polycrystalline(CC)superalloy.Here,special attentions were paid to the effects of grain boundary parameters,such as orientation difference between adjacent grains or inclination angles between crack planes and grain boundary,arranging the crack parameters associated with crack length or distance from crack front to grain boundary.A presentation will summarize a series of experimental results focusing on 1)effects of primary and secondary crystal orientations,2)temperature-dependent crack propagation mode and 3)crack retardation behavior near the grain boundary.
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