オーステンパ球状黒鉛鋳鉄の二段折れ曲り破壊機構

概要

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Very high cycle fatigue tests were conducted on austempered ductile iron finished by buffing (called material A) and that finished by electropolishing (called material EA) for comparison of what please clarity. An S-N curve of rotating bending fatigue of material A represented a characteristic of a two-stage bending resembling extremely high-strength materials. This phenomenon clarified the occurrence of different fracture mechanisms through the intermediary of nonpropagating cracks. In material EA, the structural sensitivity was lower owing to the removal of the work hardening layer on the material surface. Consequently, its S-N curve of rotating bending fatigue was unexceptional, because mechanical properties of its matrix structure resemble those of its pearlitic structure. Fatigue stress amplitudes of both materials were σ_w = 382 MPa.
一般社団法人日本機械学会の論文
1995-11-25