【摘要】 为了提高高压开关壳体用铸造合金的材质水平以满足超高压大容量输变电设备对壳体材料性能的要求,进行了高强铸造铝合金的研究。试验在AlSi10Mg合金的基础上,主要考查了合金元素Cu及变质剂RE、Sr对合金热处理后力学性能的影响。试验结果表明:RE变质可同时提高AlSi10Mg合金热处理后的抗拉强度和伸长率;合金元素Cu提高合金的抗拉强度,但使得伸长率大大降低;在加入1%RE变质的同时复合加入Sr变质剂,可在进一步提高合金性能的同时,明显提高合金的伸长率。在含1%Zn、0.15%Ti的AlSi10Mg合金Cu含量3%时,复合加入1%RE和0.015%Sr变质,热处理后的力学性能可达到:σb=370MPa,δ5=2%,可以满足目前对高压开关壳体性能的要求。更多还原

【Abstract】 In order to enhance the property of cast alloys used on high voltage switch shells to meet the demand of extra-high voltage power transmission on shell materials’ property, study on high strength cast aluminum alloy was carried out. On the basis of AlSi10Mg alloy, effect of alloy element Cu and RE and Sr as modificators on alloy mechanical property after heat treatment was investigated. The result showed: addition of RE as modificator could increase the tensile strength as well as elongation of AlSi10Mg alloy after heat treatment;Cu enhanced the tensile strength and decreased the elongation greatly; Combined with 1%RE, addition of Sr as modificator could obviously improve the elongation and increase tensile strength further. With 1%Zn, 0.15%Ti, 3%Cu and the combined addition of 1%RE and 0.015%Sr as modificator included, mechanical property of AlSi10Mg alloy after heat treatment could be σb=370 MPa, δ5=2%, which can meet the demand on property of high voltage switch shell.更多还原