低合金鋼のクリープ損傷の非破壊診断に関する基礎検討

概要

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The changes in material properties caused by creep damage were observed with the test methods of electric resistance land hardness. The tested material was Cr-Mo-V steel for rotor in steam turbine. The test specimens were subjected to long term heating and creep damage before testing. The prepared conditions were in the temperature range of 450〜650℃, and the heating or loading period of 160〜8000 hours. The results obtained are summarized as follows, (1) Hardness and the ratio of electric resistivity decreased with increasing heating time or temperature. (2) Hardness and the ratio of electric resistivity remarkably decreased by creep damage. (3) Vickers hardness difference ΔH_v (H_v in the heated specimen-H_v in the creep damaged specimen) increased according to the creep damage culculated by the strain fraction rule. (4) Electric resistivity difference ΔR_ρ (R_ρ in the heated specimen-R_ρ in the creep damaged specimen) increased with increasing creep damage φ_<CL> up to φ_<CL>=0.5. (5) It is possible to estimate the material life and creep damage by measuring hardness and electric resistance.
社団法人日本材料学会の論文
1984-08-15