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Vol.58, No.3, 151 ~ 162, 2020
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| Title |
| Effect of Post Heat-Treatment on the Microstructure, Tensile and Fatigue Properties of Al 3003 Alloy Manufactured by Strip Casting Process |
| 백민석 Min-seok Baek , 어광준 Kwangjun Euh , 정창열 Chang-yeol Jeong , 이기안 Kee-ahn Lee |
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| Abstract |
| Al 3003 alloy was manufactured by strip casting process, and the effect of post heat-treatment on tensile and fatigue properties was investigated. The strip cast Al 300 alloy exhibited a unique globular shaped rapid-cooled solidification structure, and the microstructural characteristic remained after heat-treatment. Asstrip cast (F) and heat-treated (O) alloys were commonly composed of Al matrix and strengthening phases such as Al6(Mn,Fe), α-Al(Mn,Fe)Si. In the phase analysis and Factsage simulation result, Al6(Mn,Fe) fraction increased while α-Al(Mn,Fe)Si fraction decreased after heat-treatment. Strengthening phases were more uniformly and finely distributed in the case of O alloy, than F alloy. In the Vickers hardness results, F alloy (measured 59.7 Hv) showed higher hardness than O alloy (measured 53.4 Hv). The yield strengths (YS) and ultimate tensile strengths (UTS) measured 124.8 MPa and 166.4 MPa (F alloy), and 111.2 MPa and 167.2 MPa (O alloy), respectively. F alloy exhibited superior YS compared to O alloy, while UTSs were similar in both alloys. For elongation, the F alloy (19.6%) had a lower value than the O alloy (23.0%). High cycle fatigue tests were performed at room temperature under a stress ratio (R) of 0.1 and frequency (F) of 10 Hz. The F alloy exhibited higher fatigue than the O alloy under all cyclic stress conditions. However, the deviation in the fatigue property of the F alloy was relatively broader than the O alloy. Tensile and fatigue fracture surfaces were examined, and the tensile and fatigue deformation mechanisms of the strip cast Al 3003 alloy were also discussed.
(Received September 18, 2019; Accepted December 16, 2019) |
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| Key Words |
| strip casting, Al 3003, Al-Mn alloy, tensile property, high cycle fatigue, heat treatment |
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