대한용접접합학회:학술대회논문집 (Proceedings of the KWS Conference)
- 대한용접접합학회 2002년도 Proceedings of the International Welding/Joining Conference-Korea
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- Pages.59-64
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- 2002
EFFECTS OF AGING TREATMENT ON MICROSTRUCTURE AND STRENGTH OF WELD HEAT AFFECTED ZONE OF 6N01-T5 ALUMINUM ALLOY
- Yoshida, Naoharu (Department of Manufacturing Science, Graduate School of Engineering, Osaka University) ;
- Shibao, Masami (Department of Manufacturing Science, Graduate School of Engineering, Osaka University) ;
- Ema, Mitsuhiro (Technical Department, Aluminum & Copper Company) ;
- Sasabe, Seiji (Technical Department, Aluminum & Copper Company) ;
- Hirose, Akio (Department of Manufacturing Science, Graduate School of Engineering, Osaka University) ;
- Kobayashi, Kojiro F. (Department of Manufacturing Science, Graduate School of Engineering, Osaka University)
- 발행 : 2002.10.01
초록
Effects of the aging treatments on the microstructure and strength of heat affected zone(HAZ) in the welds of a age-hardened Al-Mg-Si alloy, 5N01-T5, were investigated. The base metal aging treatments before MIG welding were conducted at 423K to 473K for 28.8ks Post weld heat treatment(PWHT) to recover the HAZ strength was performed at 448K for 28.8ks. Microstructure observations, hardness measurements and tensile tests were conducted to study properties of the MIG weld joints. The position of the softest region in HAZ where the hardness insufficiently recovered after natural aging and PWHT was at a distance of approximately 15mm from the center of the fusion zone. Hardness of the softest regions after natural aging and PWHT decreased with increase in the base metal aging temperature. TEM observation clarified that strengthening