真空浇注过程中高温合金锭表面气孔产生原因分析  

Cause Analysis on the Surface Porosity in Superalloy Ingots During Vacuum Casting

作　　者：张凤祥 马国宏 万旭杰 马秀萍 吴柯汉 张华霞 ZHANG Feng-xiang;MA Guo-hong;WAN Xu-jie;MA Xiu-ping;WU Ke-han;ZHANG Hua-xia(Superalloy Casting Division,Beijing Institute of Aeronautical Materials Co.,Ltd.,Beijing 100095,China)

机构地区：[1]北京航空材料研究院股份有限公司高温合金熔铸事业部,北京100095

出　　处：《真空》2023年第4期80-84,共5页Vacuum

摘　　要：通过对真空感应熔炼工艺生产的高温合金锭表面气孔缺陷进行组织观察,对钢锭模内附着物进行热重分析,研究了真空感应熔炼高温合金锭表面气孔缺陷的形成机理。结果表明,真空浇注期间,钢锭模内壁附着的少量铁锈(Fe_(2)O_(3))会在高温作用下分解为Fe3O4,并在此过程中发生放气,产生的气体在高温下膨胀是导致合金锭表面孔洞缺陷的主要原因。The formation mechanism of air hole defects on the surface of superalloy ingots produced by vacuum induction melting process was studied through microstructure observation of the superalloy ingots and thermogravimetric analysis of the attachments in the ingot mold.The results show that during pouring,a small amount of rust(Fe_(2)O_(3))attached to the inner wall of the ingot mold decomposes into Fe3O4 under the action of high temperature,during which gas outgassing occurs.The expansion of the generated gas at high temperature is the main reason for the formation of holes on surface of alloy ingot.

关 键 词：真空感应熔炼 高温合金锭 表面质量 锭模 气孔 

分 类 号：TG27[金属学及工艺—铸造]