ABSTRACT

In assessing the strength of structures operating at high temperatures, one of the main challenges is to determine the duration of the work of these structures to fracture. Many studies deal with the problems of creep and rupture strength metals from the standpoint of the physical mechanisms of the processes. Intragranular creep rupture usually occurs at short-term destruction that is at relatively high stresses. Study presented the map of the high-temperature deformation mechanisms in the conditions of creep mechanisms and the map of long-term fracture of pure nickel was composed. To avoid the negative impact of grain boundaries on creep, instead polycrystals should be replaced by single crystals. When studying the creep of metals up to destruction by using the phenomenological approach there are usually two main fracture mechanisms: ductile and brittle. Many researchers explain the course of the creep process by the accumulation of creep pores and formation of microcracks.