铸造工艺对C19400铜合金带缺陷的影响  

Effects of Casting Processes on Defects of C19400 Alloy Strip

作　　者：赵健 章丽艳 向朝建 Zhao Jian;Zhang Liyan;Xiang Chaojian(China Copper Huazhong Copper Alloy Co.,Ltd,Huangshi 435004;Chinalco Research Institute of Science and Technology Co.,Ltd.,Beijing 102209)

机构地区：[1]中铜华中铜业有限公司,黄石435004 [2]中铝科学技术研究院有限公司,北京102209

出　　处：《特种铸造及有色合金》2024年第1期84-88,共5页Special Casting & Nonferrous Alloys

摘　　要：采用光学显微镜(OM)、场发射扫描电镜(FESEM)观察了C19400合金常规铸造与改进铸造方式制备铸锭及铜带缺陷形貌,通过工业CT V/Tome x m以20μm的扫描分辨率进行缺陷的3D检测分析。结果表明,通过采用双水冷环的改进铸造工艺方式,铸锭晶粒细化明显,晶粒尺寸约为15 mm,柱状晶区占比较少,而等轴晶区占比较大;铸锭心部等轴晶区试样的工业CT 3D缺陷检测分析和微观组织观察表明,常规铸造方式铸锭中缺陷数量较多,分布呈现网络状,缺陷尺寸达0.599 mm;改进双水冷环铸造中,铸锭中缺陷数量明显较少,分布较为分散,缺陷尺寸约0.161 mm;铜带起泡、起皮和分层缺陷内部颗粒相及条纹和铸态缺陷内部颗粒相和条纹基本一致,该类铜带缺陷由铸锭中的缩松缺陷所致,需要减少铸锭中缩松缺陷。The defect morphology of ingots and alloy strip fabricated by different casting methods were investigated by optical microscopy(OM) and field emission scanning electron microscopy(FESEM). 3D detection of defects were analyzed by CT V/Tome x m with resolution of 20 μm. The results indicate that the grain of ingot by the modified casting process of double water-cooled ring is obviously refined with dimension of 15 mm, and fraction of columnar crystal region is relatively low, while that of equiaxed crystal region is large. CT3D detection and microstructure observation reveal that large quantities of defects are distributed in network by conventional casting method, with dimension of 0. 599mm, while those by improved casting are dipersively distributed with dimension of 0. 161 mm. The particle phases and stripe in defects of copper strip foaming, peeling and delamination are basically the same as those in as-cast defects, which are caused by shrinkage defects in the ingot, indicating the necessity to reduce shrinkage defects in the ingot.

关 键 词：C19400合金 铸造工艺 缺陷形貌 

分 类 号：TG146.11[一般工业技术—材料科学与工程]