近液相线锻造及部分重熔制备AM60镁合金半固态坯及触变成形研究  

Study on Thixoforging of AM60 Magnesium Alloy Semi-Solid Billet Prepared by Near-Liquidus Forging and Partial Remelting

作　　者：闫冬[1] 纪兴华[2,3] 陈文[2] 孙召瑞[2] 陈刚[3] 

机构地区：[1]枣庄科技职业学院机械工程系,山东滕州277500 [2]莱芜职业技术学院,莱芜市粉末冶金先进制造重点实验室,山东莱芜271100 [3]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《铸造》2014年第5期429-431,共3页Foundry

基　　金：国家自然科学基金资助项目(51175018);莱芜市高新区创新发展项目(201328);校教师科研基金项目(201308JC10、201308JX13)

摘　　要：采用近液相线锻造及部分重熔的方法获得了AM60镁合金球晶组织。通过近液相线锻造工艺得到具有细小枝晶组织的坯料,在固液温度区间保温处理得到球晶组织。研究了重熔过程中AM60镁合金的微观组织结构转变及触变成形件的拉伸力学性能。结果表明:保温时间和温度的增加能够加快球晶组织的转变,重熔处理过程中晶粒尺寸先减小后增大;采用近液相线锻造、部分重熔和触变成形制备的AM60镁合金制件具有较好的力学性能,屈服强度、抗拉强度和伸长率分别达到了180 MPa、200 MPa和15%。The AM60 magnesium alloy globular microstructures were prepared by near-liquidus forging plus partial remelting. A fine dendritic microstructure was obtained by near-liquidus forging, globular microstructure was produced by isothermal treatment at the semi-solid temperature range for a period of time. Microstructure evolution during partial remelting was studied and tensile mechanical properties of thixoforged components were determined. The results show that prolonging time and increasing temperature promote a faster spheroidization. Grain size decreases first and then increases. Good mechanical properties are obtained with yield strength of 180 MPa and the ultimate tensile strength of 200 MPa and elongation of 15%.

关 键 词：镁合金 近液相线锻造 部分重熔 触变成形 

分 类 号：TG146.22[一般工业技术—材料科学与工程]