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 journalArticle

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.
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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maraging steels
shot peening
Maraging steel
Shot peening
hardness
Hardness
Fatigue of materials
Fatigue strength
bending fatigue
cycles
Bending (deformation)
fatigue tests
shot
humidity
Atmospheric humidity
Aging of materials

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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. / 永野茂憲; 皮籠石紀雄; 森山三千彦; 陳強; 長島悦一.

In: Zairyo/Journal of the Society of Materials Science, Japan, Vol. 56, No. 12, 2007, p. 1126-1132.

Research output: Contribution to journalArticle

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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 cycles for surface fracture and 10<SUP>8 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.",
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AU - 皮籠石, 紀雄

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