Effects of Artificial Small Defect and Corrosive Environment on Torsional Fatigue Strength of High Strength Spring Steel
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- WAKITA Masami
- Chuo Spring Co., Ltd.
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- KUNO Takanori
- Chuo Spring Co., Ltd.
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- AMANO Ayamitsu
- Chuo Spring Co., Ltd.
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- NEMOTO Akihiko
- Meijo Univ.
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- SARUKI Katsushi
- Dept. of Material Sci. & Eng., Faculty of Sci. & Tech., Meijo Univ.
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- TANAKA Keisuke
- Dept. of Mech. Eng., Nagoya Univ.
Bibliographic Information
- Other Title
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- 高強度ばね鋼のねじり疲労強度に及ぼす微小欠陥および腐食環境の影響
- コウキョウド バネコウ ノ ネジリ ヒロウ キョウド ニ オヨボス ビショウ ケッカン オヨビ フショク カンキョウ ノ エイキョウ
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Abstract
Torsional fatigue tests were conducted for spring steels whose Vickers hardness were 430, 480, 550, and 620. The effects of corrosive environment and surface artificial pits on the fatigue strength were studied. The fatigue strength of smooth specimens was maximum at 550HV for fatigue in air and 480HV for corrosion fatigue. Intergranular fracture surfaces were observed on the fatigue fracture surface corresponded to the decrease in the fatigue strength of the high-hardness materials. The fatigue fracture of smooth specimens was generated from shear crack for fatigue in air and from corrosion pit in corrosion fatigue. The stress intensity factor for crack initiation from corrosion pit was nearly the same for all materials. The fatigue strength reduction factor was constant under fatigue loading in air, while decreased with increasing fatigue life and hardness in corrosion fatigue. For the case of long of the material with 620HV in corrosive environment, a significant influence of the artificial pit on the fatigue strength was not seen. Many small cracks were observed at the sites except for artificial pit on the surface of the 620HV specimens fatigued at low stress levels.
Journal
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- Journal of the Society of Materials Science, Japan
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Journal of the Society of Materials Science, Japan 56 (12), 1096-1102, 2007
The Society of Materials Science, Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390282680396367232
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- NII Article ID
- 130002085914
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- NII Book ID
- AN00096175
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- ISSN
- 18807488
- 05145163
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- NDL BIB ID
- 9309781
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed