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%.
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