大规格7A04铝合金铸锭裂纹缺陷的研究  

Study on Crack Defects of Large-Sized 7A04 Aluminum Alloy Ingots

作　　者：崔晓晴 孙小涵 贺永东[1] 赵亿坤[1] CUI Xiao-qing;SUN Xiao-han;HE Yong-dong;ZHAO Yi-kun(School of Physical Science and Technology,Xinjiang University,Urumqi 830046,Xinjiang,China;Shandong Energy Digital Technology Co.,Jinan 250000,Shandong,China)

机构地区：[1]新疆大学物理科学与技术学院,新疆乌鲁木齐830046 [2]山东能源数字科技有限公司,山东济南250000

出　　处：《铸造》2024年第8期1116-1122,共7页Foundry

基　　金：新疆科技厅重点研发任务专项资助:航空航天用7系铝合金的制备技术研发与应用(20231108B)。

摘　　要：采用电磁铸造法制备880 mm规格直径的7A04铝合金铸锭,通过工业CT扫描、SEM和EDS等检测分析手段研究了该铝合金铸锭中裂纹缺陷的形成原因和抑制措施,同时对缺陷附近区域微小缺陷的数量与分布进行了分析。结果表明,该铸锭出现裂纹的实质为Al_(2)O_(3)(氧化物)和少量Fe元素富集,位置靠近铸锭中心区域。观察微小缺陷其数量随半径尺寸的增大而略有减少,且大于40μm的缺陷占比最大。通过分析,微小缺陷的形成与裂纹缺陷的形成有关。在铸造前从合金熔体中去除夹杂物和气体氢,完善除气、扒渣等工艺过程是避免这些缺陷的方法。The 880 mm diameter 7A04 aluminum alloy ingot was prepared by electromagnetic casting method,and the formation causes and inhibition measures of the crack defects in this aluminum alloy ingot were investigated by industrial CT scanning,SEM&EDS and other inspection and analysis means,and the number and distribution of the tiny defects in the region near the defects were analyzed at the same time.The results showed that the essence of cracks in this ingot was the enrichment of Al_(2)O_(3)(oxide)and a small amount of Fe elements,and the location was close to the center of the ingot.It is observed that the number of micro defects decreased slightly with the increase of radius size and the largest percentage of the defects was more than 40μm.The analysis showed that the formation of micro defects was related to the formation of crack defects.Removal of inclusions and gaseous hydrogen from the alloy melt before casting,perfecting the process of degassing and slag removal are ways to avoid these defects.

关 键 词：7A04铝合金铸锭 裂纹 Al_(2)O_(3) Fe元素富集 

分 类 号：TF807[冶金工程—有色金属冶金] TG245[金属学及工艺—铸造]