7050铝合金软接触连铸扁锭裂纹抑制原因分析  

Analysis on Hot Cracking Depression Reasons for 7050 Aluminum Alloy Slab by Soft-Contact Continuous Casting

作　　者：曹志强[1] 李廷举[1] 张红亮[1] 刘吉东[1] 王家淳[2] 

机构地区：[1]大连理工大学,辽宁大连116024 [2]苏州有色金属加工研究院,江苏苏州215026

出　　处：《稀有金属材料与工程》2010年第12期2222-2226,共5页Rare Metal Materials and Engineering

摘　　要：7050铝合金软接触电磁连铸过程中的电磁场能促使熔体产生受迫流动,改善铸坯质量,抑制微裂纹。电磁场一方面通过均匀温度场降低内应力或应变,使金属高温脆性区主要处于受压状态,减少了热裂纹形成的外部诱因;另一方面,通过细化组织,减小不可补缩区间,减少晶界低熔点化合物数量,降低了合金铸锭的热裂倾向性,从而达到了抑制铸造裂纹的目的。In the process of soft-contact electromagnetic continuous casting of 7050 aluminum alloy, the forced flow of molten melt is produced by the intermediate magnetic field, which can improve the microstructure and eliminate hot cracks. On one hand, the electromagnetic filed can reduce the external factors for hot cracking through improving the casting condition to decrease the temperature gradient, to release the thermal stress and strain and to make alloying brittleness zone mainly in the state of being compressed. On the other hand, it also can decrease the hot cracking tendency of alloys by reducing the size of unfeeding zone and decreasing the quantities of eutectic compounds of low melting point. As a result of the two facts above, the cracking of electromagnetic continuous casting slab is eliminated.

关 键 词：7050铝合金 软接触 连铸过程 扁锭 裂纹抑制 原因分析 Continuous Casting Slab Aluminum Alloy Hot Cracking 电磁场 低熔点化合物 热裂倾向性 均匀温度场 铸造裂纹 铸坯质量 细化组织 外部诱因 受压状态 受迫流动 

分 类 号：TG249.7[金属学及工艺—铸造]