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Vol.47, No.3, 175 ~ 182, 2009
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| Title |
| The Effect of Solution Heat Treatment and Aging Treatment on the Mechanical Properties of Backward Extruded A6061 Alloy for Pressure Vessels |
| 강덕수 Duck Soo Kang , 우기도 Kee Do Woo , 유계형 Gye Hyoung Yoo , 문민석 Min Seok Moon , 권의표 Eui Pyo Kwon , 남궁천 Gung Cheon Nam |
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| Abstract |
| Mechanical properties and precipitation behavior of backward extruded 6061 Al alloy for pressure vessel were investigated using tensile test, transmission electron microscopy (TEM) and differential scanning calorimeter (DSC). In this study, solution heat treatment (SHT) was performed at 535℃ for 30~90 min and aging treatment was conducted at 177 and 190℃ for 1~7 h. Maximum tensile strength of 36.6 kgf/mm2 and yield strength of 33.29 kgf/mm2 were achieved at the aging time of 5 h at 190℃. TEM observation showed that fine needle-like β'' phase which has 35~45 nm of length was uniformly distributed in the aged 6061 Al alloy specimen. From tensile test, TEM and DSC analysis, it is expected that aging time of 2~5 h at 190℃ is suitable for the extruded A6061 used as pressure vessels. |
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| Key Words |
| A6061 alloy, precipitation, aging, needle-Like β″ phase |
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