Effect of Heat Treatment on Tensile and Fatigue Properties of Al 3527 K Alloy Manufactured by Strip Casting

Abstract

This study investigated the effect of heat treatment on the tensile and fatigue properties of Al 3527 K alloy manufactured by the strip casting process. Al 3527 K alloy (as strip cast material, F) produced by twin roll strip casting and heat treated (480°C/6 h., H) alloy were examined and compared. Microstructure observation results revealed that both alloys (F and H) featured rapid solidification microstructures. In addition, both alloys were identified to be composed of Al, Al 6 (Mn, Fe) and AlFeMnSi phases. As heat treatment was applied, H alloy formed a more even phase distribution than F alloy. Tensile results showed F alloy to have a yield strength of 135.0 MPa, tensile strength of 194.7 MPa and elongation of 14.3%, while H alloy had a yield strength of 147.9 MPa, tensile strength of 235.2 MPa and elongation of 10.9%. The tensile properties showed that heat treatment resulted in an increase of strength and decrease of elongation. In tensile fracture surface observation, both alloys showed typical ductile fracture modes. The F alloy was measured to have a dimple size of 6.8 µm on average, and the H alloy measured 4.2 µm in tensile fracture surfaces. High-cycle fatigue results showed the F alloy to have a fatigue limit of 120 MPa, and the H alloy to have that of 145 MPa. Al 3527 K-F alloy featured a larger deviation in fatigue life in all identical stress conditions compared to the H alloy. This study also discussed the tensile and fatigue deformation behaviors of Al 3527 K alloy manufactured by strip casting through the abovementioned mechanical properties as well as the fractographies.

Effect of Post Heat-Treatment on the Microstructure, Tensile and Fatigue Properties of Al 3003 Alloy Manufactured by Strip Casting Process

“…후 열처리 이후 Chinese script 형상의 Al 6 (Mn,Fe) 상들은 침상 (needle) 형태로 바뀌거나 고루 분산된다고 언급되었다. 그 외 일부 strip casting 공정으로 제조된 금속 소재에 대해 서도 기계적 특성에 미치는 후 열처리 영향 [12][13][14], 균질 화 영향 [15]…”