引張予ひずみを受けたアルミ合金の腐食疲労強度に及ぼす試料表面層の影響

概要

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In order to investigate the influence of tensile prestrain on the corrosion fatigue strength of metal, high cycle fatigue tests were carried out on aluminum alloy (2017) sheet specimens under completely reversed plane bending stress in laboratory air and in salt water (3.0% NaCl). The specimens were prestrained and the surface layer was removed by an electrochemical process. The results of these specimens were compared with those without surface removal. It is evident that the corrosion fatigue life of the specimen without surface layer is independent of the degree of tensile prestrain and is longer than that of the specimen with surface layer. In corrosion fatigue, the presence of surface layer is expected to decrease fatigue fracture resistance because the specimen becomes more sensitive to environment with increasing dislocation density and furthermore the rate of crack propagation through the surface is high in the presence of surface layer. On the other hand, the fatigue life in air is increased by the presence of surface layer because the work-hardening appears on the surface layer and in the inner part of the specimen by tensile prestrain.
社団法人日本材料学会の論文
1979-08-15