RRA 처리가 AA 7039 Al 합금의 기계적 성질과 내응력 부식성에 미치는 영향

• 영문명: The Effect of the Retrogression and Reaging Treatments on the Mechanical Properties and Susceptibility to Stress Cracking of AA 7039 Al Alloy
• 발행기관: 강원대학교 산업기술연구소
• 저자명: 전상조(Sang Jo Jun) 김준수(Jun Soo Kim) 김송희(Song Hee Kim)
• 간행물 정보: 『산업기술연구』vol.7, 49~58쪽, 전체 10쪽
• 주제분류: 공학 > 공학일반
• 파일형태: PDF
• 발행일자: 1987.09.30

영문 초록

To investigate the effect of the Retrogression and Reaging(RRA) treatment on the strength and the stress corrosion cracking in AA 7039 the measurement of hardness, tensile properties and the time to failure in a constant rate method were measured. Transmission electron microscope was used to examine the microstructural changes within graln and grain boundary. The results show that the RRA treatment of the T6 condition results in a significnat increase in the time to failure without sacrifying the original T6 strength. It is believed that high density and even distribution of precipitates in RRA condition were observed within grain so that the RRA condition could have similar strength to the T6 condition. The presence of fine dispersion of semicohernt η’ transition phase is also believed to contribute to that effect. Examination of the grain boundary microstructure shows that the RRA treatments increases significantly the average size of the grain boundary preciptates. It is suggested that the benificial effect of the RRA treatment on the susceptibility to SCC be due to the increase in the size of grain boundary precipitates obtained during the retrogression treatment.

목차

ABSTRACT

Ⅰ. 서론

Ⅱ. 실험방법

Ⅲ. 실험결과 및 고찰

Ⅳ. 결론

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