Abstract
In this work, the sources of the high creep resistance of martensitic steels containing 9% Cr were considered based on the results of studying the evolution of the dislocation structure of martensite in P92-type steel in creep at 650°C. The steel structure after tempering was characterized by significant elastic microstrains of the crystal lattice, which were produced by dislocations of the same sign and long-range stresses from the dislocation boundaries of laths. The high creep strength of martensitic steels containing 9% Cr is reached by the action of both threshold stresses from carbonitrides M(C,N) and by internal elastic stresses.
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