作　　者： ; ; ; ;

机构地区： 广州有色金属研究院

出　　处： 《材料研究与应用》 2012年第3期153-158,共6页

摘　　要： 对低温浇注A356铝合金的组织和二次加热组织转变规律及半固态锻造铝合金轮毂的组织与力学性能进行了研究.结果表明:在635～655℃下浇注,可获得具有细小均匀、近球形晶粒的A356铝合金圆棒坯,圆棒坯在600℃下加热60 min,晶粒进一步球化;在750 kN锻压力下可锻造成铝合金轮毂,经T6热处理后,轮毂的抗拉强度、屈服强度和伸长率分别为327.6 MPa,228.3 MPa和7.8%.表明,低温浇注法制备半固态坯料与半固态锻造工艺相结合,可生产出高性能的铝合金轮毂. The as-cast microstructures, the microstructure evolution during reheating and the mechanical proper- ties of forged wheels of semisolid A356 aluminum alloy prepared by pouring at low temperature were studied. The results show that the A356 aluminum alloy round billet with fine, uniform and near-globular grains can be ob- tained when the melt is poured in the temperature range of 635-655 ~C. When the round billet is reheated at 600 ~C for 60 min, the near-globular grains change into globular ones and the round billet can be easily forged in- to wheels. The tensile strength, yield strength and elongation of forged wheels with T6 heat treatment are 327.6 MPa, 228.3 MPa and 7.8%. The present experimental results indicate that the semisolid forging combining with the pouring at low temperature is an effective technique to produce aluminum alloy wheels with high mechanical DroDerties at low production cost.

关 键 词： 铝合金轮毂 半固态金属 锻造 低温浇注

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]