Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)
- 2003.10b
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- Pages.123-126
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- 2003
Strength Evaluation of Aluminum Alloy Bolt by Nano-Indentation Hardness Test
- KUBOTA Yoshihiro (Daiichi Kogyo Co., LTD.) ;
- NAKAMURA Tamotsu (Shizuoka University) ;
- KOBAYASHI Mitsuo (Kogakuin University) ;
- FUKUDA Katsumi (University of Tokyo)
- Published : 2003.10.01
Abstract
A high strength aluminum alloy bolt (A7050, T7 temper treatment) has been developed by the authors. The bolt has a small grain size in the whole area of the bolt because of the large equivalent strain followed by thermo-mechanical treatment. As the bolt made of A 7050 has a risk of stress corrosion cracking, each grain should be strengthened the grain inside than the grain boundary in order to improve the stress corrosion cracking resistance. It has been confirmed that the nano-indentation hardness at each grain inside increased with the increasing equivalent strain by thermo-mechanical treatment processing.