On the Development of Physically Based Life Prediction Models in the Thermo Mechanical Fatigue of Ni-Base Superalloys

摘要: In a world increasingly concerned with environmental factors and efficient use of resources, increasing operating temperatures high temperature machinery can play an important role in meeting these goals. addition, the cost failure such devices is rapidly becoming prohibitive. For example, airline crash airframe engine manufacturers are, on average, held liable for 1,000,000 euros per fatality excluding loss property. Thus there considerable pressure to make that operate much more safely at temperatures. This means old ways guarding against fatigue (e.g. factor safety, S/N curves, creep life) are no longer acceptable; reliable, accurate, needed manage life, durability risk. this paper, considered terms past successes current challenges. Particular emphasis placed understanding damage mechanisms their interactions both scientific interest technological importance. Materials used nuclear reactors selected steels solid solution Ni-base alloys) hot sections jet engines superalloys) as vehicles illustrate evolution interaction. Phenomenological life prediction models presented compared physics-based evolution/interaction which based observed physical processes creep/fatigue/environment interactions. It shown many cases, spite creep-fatigue interactions, most damaging forms occur under thermo-mechanical (TMF) loading result from interaction slip bands oxidized boundaries.