[ICACE2019] Effect of cooling rate on the corrosion resistance and mechanical property of AlSi10MnMg alloy
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AlSi10MnMg (AA365) is widely used in automobile parts owing to excellent castability and high corrosion resistance. Heat treatments are used to obtain the highest mechanical property of the alloy. The mechanical and corrosion properties of AA365 aluminum alloy in 0.3 M/L H2SO4 and 3.5 wt.% NaCl solution according to the different cooling rates were investigated to understand the effects of cooling rates and the type of heat treatments on the performance of the alloy. The lowest corrosion rates in H2SO4 and NaCl, were 1.01 and 53.7 mpy, respectively. They were investigated when the specimen treated T4 and cooled at the fastest cooling rate at 9000 K/min after each step among all the cooling rates. It was revealed that the fewer amount of detrimental needle-shaped β-Al5FeSi phases on corrosion property can be suppressed by the fast cooling rates. With respect to the mechanical property of AA365 alloy, the mechanical strengths of T4 heat-treated alloy cooled at 9000 K/min increased by 76.6 MPa of the ultimate tensile strength and 49.8 MPa of the yield strength more than the alloy cooled at 16 K/min. The mechanical strengths of T6 heat-treated AA365 alloy strengthened mean 11 MPa of the tensile strength and 16 MPa of the yield strength rather than the only solution-treated alloys, owing to age hardening.
Abstract
AlSi10MnMg (AA365) is widely used in automobile parts owing to excellent castability and high corrosion resistance. Heat treatments are used to obtain the highest mechanical property of the alloy. The mechanical and corrosion properties of AA365 aluminum alloy in 0.3 M/L H2SO4 and 3.5 wt.% NaCl solution according to the different cooling rates were investigated to understand the effects of cooling rates and the type of heat treatments on the performance of the alloy. The lowest corrosion rates in H2SO4 and NaCl, were 1.01 and 53.7 mpy, respectively. They were investigated when the specimen treated T4 and cooled at the fastest cooling rate at 9000 K/min after each step among all the cooling rates. It was revealed that the fewer amount of detrimental needle-shaped β-Al5FeSi phases on corrosion property can be suppressed by the fast cooling rates. With respect to the mechanical property of AA365 alloy, the mechanical strengths of T4 heat-treated alloy cooled at 9000 K/min increased by 76.6 MPa of the ultimate tensile strength and 49.8 MPa of the yield strength more than the alloy cooled at 16 K/min. The mechanical strengths of T6 heat-treated AA365 alloy strengthened mean 11 MPa of the tensile strength and 16 MPa of the yield strength rather than the only solution-treated alloys, owing to age hardening.
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