タフトライド防止処理鋼の機械的性質と疲労強度

概要

論文の詳細を見る
The purpose of this research was to study the fatigue strength and mechanical properties of anti-tufftrided steel. The non-tufftrided, tufftrided and anti-tufftrided specimens of SS 41 and SM 50 A were used and their hardness, tensile strength and fatigue limit were measured. The relation between the tensile load on spot welded cross joints and the tufftriding time was investigated and the fracture surfaces were observed by scanning electron micrographs in order to study the effects of inorganic coating of the anti-tufftrided specimens. The results obtained are summarized as follows. The differences in microstructures, hardness, tensile strength and compressive residual stress were obviously recognized between the tufftrided and anti-tufftrided specimens. But the fatigue limits of both specimens were approximately the same. It is note-worthy that the anti-tufftrided mechanical parts maintains the mechanical properties similar to those of the non-tufftrided one and retains the fatigue strength equal to that of the tufftrided one. Against tensile load on spot welded cross joints, the tufftrided specimen markedly reduced its strength compared with the non-tufftrided specimen, but this strength reduction was not so much on the anti-tufftrided specimen. The effect of anti-tufftriding coating was confirmed also by the results of fractographical observation.
1982-11-15