地熱蒸気下における鋼の腐食疲労について

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The exploitation of geothermal energy as one of new energy sources has been highlighted, and now it is mainly utilized for generating electric power. However, it has become a problem that the fatigue strength of stainless steels used for the turbine blades and other parts decreases due to corrosion by H_2S contained in geothermal steam. In order to solve this problem, the corrosion fatigue test on 13 Cr-Mo, 12 Cr-Mo-V, 3 Cr-Mo, Cr-Mo-V and 3.7 Ni-Cr-Mo steels was carried out in geothermal steam at the Onikobe Geothermal Power Station. The main results obtained are summarized as follows : (1) The fatigue strength of steels in geothermal steam was much lower than that in air. The rate of decrease in fatigue strength was smallest for 13 Cr-Mo steel, and was largest for 3. 7 Ni-Cr-Mo steel among five steels. (2) 13 Cr-Mo steel was corroded very little even if being exposed in geothermal steam for a very long period. (3) A method of estimating fatigue strength at 109-1012 number of cycles in geothermal steam from the corrosion fatigue strength of the specimen and the fatigue strength of the corroded specimen was established by separating the cycle-dependent effect of fatigue damage from the time dependent effect of corrosion damage. For this purpose the corrosion coefficient K_c=1+B・t_0^<n_1>・N_f^<n_2> where t_0 and N_f are corrosion time and number of cycles was defined. For 13 Cr-Mo Steel, B= 4.33×l0^<-3> n_1=0.11, n_2=0.22 were obtained.
社団法人日本材料学会の論文
1975-01-15

地熱蒸気下における鋼の腐食疲労について

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