塩水腐食した熱間圧延鋼板の疲労郷土低下要因の検討

概要

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In order to inverstigate the corrision effect on the fatigue strength of steel used in automobile suspension members, plane bending fatigue tests were carried out. The materials used were 0.075%C and 0.15%C hot-rolled steel sheets. One group of specimens were intermittently dipped in 5% salt-water at room temperature and another group continously in 20% HCI aqueous solution at 50℃. The fatigue strength of the corroded specimens was correlated with the feature of the corroded surfaces. The main factors affecting the degradation of fatigue strength due to corrision were the reduction of the sectional area and the increase of surface roughness. The corrison products and charged hydrogen did not decrease the fatigue strength of the corroded specimen in a dry condition. The following equation was proposed for estimation of the bending fatigue strength σ_<wap> of the specimens after the corrosion products were removed. σ_<wap>=(Z_c/Z_0)・(1-ηΔd_<max>^<0.4>)・σ_<w0> where Z: section modulis, 0.45 for 0.075C steel and 0.65 for 0.15 steel, Δd_<max>: maximum deoth of roughness due to corrison, suffix 0: Electoropolished specimens, suffix C: Corroded specimens.
社団法人日本材料学会の論文
1985-10-15