Mechanisms of strengthening of steel 12Kh1MF
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As-received, and also after prolonged aging under operating conditions, the long-term strength of steel 12Kh1MF depends on the quantity of bainite in the structure and the mean distance between vanadium carbide particles in structurally free ferrite, the mean distance between VC particles becoming smaller with increasing amounts of bainite.
In the process of aging at 813°K for 40–100 thousand h the mean distance between VC particles increases negligibly, which is explained both by the stability of the original structure and precipitation of new particles.
Strengthening of the solid solution of steel 12Kh1MF is due mainly to the increase of friction in the lattice with the solution of molybdenum, in which case lowering the molybdenum content of the solid solution to 0.14–0.10 wt.% has no essential effect on the long-term strength of the steel.
KeywordsPrecipitation Carbide Ferrite Solid Solution Vanadium
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