Abstract
We perform the detailed investigation of 10Kh2M and 12Kh1MF ferrite-pearlite steels operating in water-steam environments in different boilers and power plants in Poland and Ukraine for up to 240,000 h with an aim of evaluation of their susceptibility to hydrogen-induced cracking (blistering). For both types of steel, we establish similar regularities of the influence of operating conditions on the properties of materials. An abrupt deterioration of the mechanical properties of materials was observed after 110,000 h of operation. It was accompanied by an increase in the concentration of residual hydrogen and pronounced changes in the parameters of the crystal lattice of iron as well as in the volume fraction and morphology of the pearlite phase. The results of hydrogen-permeation tests were used to choose the parameters characterizing the susceptibility of steels to blistering. For both types of steel, we determine the correlation between their susceptibility to blistering and changes in the microstructure in the process of operation.
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