硬さレベルを変えたマルエージング鋼の疲労強度に及ぼすショットピーニングの影響

Translated title of the contribution: Influence of Shot Peening on Fatigue Strength of Maraging Steels with Different Hardness

永野 茂憲, 皮籠石 紀雄, 森山 三千彦, 陳 強, 長島 悦一

Research output: Contribution to journalArticlepeer-review

Abstract

In order to investigate the hardness dependence on the fatigue strengths for surface fracture and internal fracture, rotating bending fatigue tests were carried out for maraging steels using specimens with different hardness obtained by heat-treating at different under-aging conditions. Fatigue limit for surface fracture was evaluated in electro-polished specimens and the one for internal fracture was in shot-peened ones, where fatigue limits were defined as fatigue strengths at 10<SUP>7</SUP> cycles for surface fracture and 10<SUP>8</SUP> cycles for internal fracture, respectively. Fatigue limit for internal fracture increased with increase in hardness similar to the one for surface fracture. However, the proportional relationship between the fatigue limit and the hardness existed till higher hardness in the fatigue limit for internal fracture than in the one for surface fracture. This difference in the hardness dependence on fatigue limit was discussed from the viewpoint of the influence of humidity on the fatigue strength.
Translated title of the contributionInfluence of Shot Peening on Fatigue Strength of Maraging Steels with Different Hardness
Original languageJapanese
Pages (from-to)1126-1132
Number of pages7
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume56
Issue number12
DOIs
Publication statusPublished - 2007

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