Abstract
1. Isothermal treatment of steel 12Kh1MF at 350–500°C leads to the formation of a structure consisting of upper and lower bainite. At 500° the structure consists primarily of upper bainite, and at 350° of lower bainite. 2. With tempering of the steel with a structure of upper and lower bainite at 730° for 3 h the dislocations undergo redistribution of the polygonization type within ferrite needles, with development of a cellular substructure. The acicular structure of the matrix is retained in this case. The density and evenness of the distribution of carbides is higher in upper bainite than in lower bainite. 3. Steel 12Kh1MF with a structure of upper bainite is more susceptible to recrystallization as compared with a structure of lower bainite, which is responsible for the higher heat resistance of the latter.
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