ラジカル窒化した軸受鋼における内部き裂の伝ぱ挙動

Translated title of the contribution: Propagation Behavior of an Internal Crack of a Radical-nitrided Bearing Steel

皮籠石 紀雄, 森野 数博, 田尻 康之, 陳 強, 王 清遠, 深田 一徳

Research output: Contribution to journalArticle

Abstract

In order to investigate the propagation behavior of an internal crack in surface treated steel, rotaing bending fatigue tests were carried out for a radical-nitrided bearing steel. The fracture occurred from a specimen surface under high stress levels, whereas a fish-eye fracture occurred under low stress levels. Consequently, <I>S-N</I> curve was duplex <I>S-N</I> one. A circular trace was observed inside the fish-eye when the fracture occurred under two-step variable stress amplitude test. It was suggested that the trace was formed by the change in stress amplitude. Moreover, from the change in the trace size depending on the stress level and the number of stress cycles, it was concluded that there is a fatigue limit for the internal fracture meaning the limit for crack propagation and most of fatigue life the internal fracture was occupied by the growth life of a small internal crack.
Translated title of the contributionPropagation Behavior of an Internal Crack of a Radical-nitrided Bearing Steel
Original languageJapanese
Pages (from-to)1362-1368
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume71
Issue number710
DOIs
Publication statusPublished - 2005

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