近液相线法铸造非枝晶A356合金组织与成形性能  

NONDENDRITIC MICROSTRUCTURE OF A356 ALLOY OBTAINED BY THE NEARBY LIQUIDUS CASTING AND THIXOFORMED PROPERTIES

作　　者：王平[1] 崔建忠[1] 

机构地区：[1]东北大学材料电磁过程教育部重点实验室,沈阳110004

出　　处：《金属学报》2002年第9期952-955,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金 59974009;中国博士后科学基金No.29;沈阳市科学基金2001228-07-13资助项目

摘　　要：用近液相线半连续铸造法制备出具有等轴晶粒的半固态 A356合金坯料,合适的铸造工艺为铸造温度 615℃,保温 20min;铸造速度 120 mm/min,冷却水流量 0.086 m3/min.在电阻炉加热的条件下,半固态A356合金坯料的重熔加热温度场均匀,合适的加热温度为580-590℃.在模具温度 400-600℃的条件下,触变成形汽车发动机用轴瓦盖热处理后的σb值达到290.2 MPa,δ5达到12.9％.The A356 aluminum alloy castings with fine equiaxed nondendritic grains are obtained by means of the nearby liquidus semi-continuous casting method. Appropriate casting technical parameters are casting temperature-615 degreesC, holding time-20 min, casting speed-120 mm/min,cooling water amount-0.086 m(3)/min. The temperature field in the electric stove reheated to the liquid-solid zone is homogeneus and the proper reheating temperature is 580-590 degreesC; When the mould temperature is 400-600 degreesC, the head of bearing used in automobiles can be thixoformed successfully, its sigma(b) is 290.2 MPa and delta(5) 12.9%.

关 键 词：A356合金 等轴晶 近液相线半连续铸造 触变成形 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249[金属学及工艺—金属材料]