5056铝合金圆锭表层偏析对挤压管材的影响  

Effect of surface segregation of 5056 Al-alloy billets on extruded pipes

作　　者：黎业生[1] 江亚龙 谢侃如 刘经发 邓直洪 罗杰 

机构地区：[1]江西理工大学,江西赣州341000 [2]广东和胜工业铝材股份有限公司,广东中山526463

出　　处：《轻合金加工技术》2016年第4期12-16,共5页Light Alloy Fabrication Technology

摘　　要：以热顶半连续铸造生产的5056铝合金圆锭为例,根据工业上铝合金管材实际生产工艺流程,使用金相分析、直读光谱分析及电子扫描分析,研究了铸锭表面偏析层对均匀化热处理、挤压加工及阳极氧化的影响。结果表明,铸锭的表层化学成分及相组成与心部的有较大差异;在对其进行520℃7 h均匀化退火后,铸锭心部均匀化效果较好,但是铸锭表层发生轻微的过烧;挤压生产过程中偏析层会卷入挤压制品表面,经过阳极氧化会产生氧化色差。The effects of surface segregation layer on homogeneous heat treatment,extrusion processing and anodizing were studied for 5056 Al-alloy billets cast by hot-top semi-continuous casting. Metallographic analysis,direct reading spectrometry and scanning electron microscope were used in the research based on the practical production process of Al-alloy pipes in the industry. The results show that the billet surface and core are quite different in chemical compositions; that the core is more homogeneous and the surface is slightly over burnt when the billet is homogenized at 520℃ for 7h; and that aberration appears on the surface after anodic oxidation,mainly due to the segregation layer squeezed into the product surface in extrusion.

关 键 词：5056铝合金 偏析 均匀化退火 挤压管材 阳极氧化 

分 类 号：TG146.21[一般工业技术—材料科学与工程]