Fatigue Strength-Hardness Relationship High Carbon Low Alloy Steel

Fish-eye shape prediction with gigacycle fatigue failure

“…This bright region, with a dark region (the defect) inside, may be observed on the fracture surface by the naked eye or a microscope after fatigue failures. This typical fractography feature is known as fish‐eye, which was discovered in 1968 by Ohuchida 1 on the fracture surface of Cr–Ni–Mo high carbon alloy steel under rotating bending fatigue loading.…”

Fatigue Failure Assessment in Ultrasonic Test Based on Temperature Evolution and Crack Initiation Mechanisms

“…It is imperative to point out that the fish-eye feature was reported by Ohuchida for the first time in 1961. He suggested that fish-eye appear in the fracture surface of metallic materials which possess higher hardness on the surface [38]. He related in his experiments that the fish-eye could not appear in the fracture surface for specimens with hardness below 550 HV.…”

Comportamento Do Aço Din 34crnimo6 Em Fadiga De Altíssimo Ciclo

“…37 Figura 16: Diferentes estágios da evolução da trinca no UHCF [15,16]. 39 Figura 17: Curva S-N e relação de dureza obtida por Ohuchida [18]. 40 Figura 18: a) Fish-eye numa superfície de fratura.…”