熔炼工艺对GH690-Re组织和成分的影响  

Effects of Melting Processes on Microstructure and Composition of GH690-Re Alloys

作　　者：李滔[1] 李家华[2] 周海涛[1] 刘克明[3] 张振栋[2] 邵兴明 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]东北大学材料与冶金学院,辽宁沈阳110016 [3]江西省科学院江西省铜钨新材料重点实验室,江西南昌330029 [4]江苏新华合金电器有限公司,江苏泰州225700

出　　处：《热处理技术与装备》2013年第4期9-13,共5页Heat Treatment Technology and Equipment

基　　金：国家火炬计划项目(2011GH30513);江苏省科技支撑计划(SBE20100527)

摘　　要：采用真空感应(VIM)+电渣重熔(ESR)技术制备GH690-Re镍基高温合金,通过AAS、OM、SEM等手段对合金组织成分进行检测分析。结果表明,GH690-Re高温合金经VIM熔炼后,显微组织为粗大枝晶,大量Cr23C6在晶界处析出。而再经ESR熔炼后,表层晶粒细化,组织为等轴奥氏体晶粒,心部为细短枝晶,晶界处无明显析出物,合金成分被优化,基本达到脱碳效果,热加工性能得到改善。The GH690-Re high temperature alloy was prepared by the VIM and ESR technology. Detection analysis was conducted to investigate the composition and microstructure by AAS, OM, SEM. The results showed that there was coarse dendritic crystal and a large number of Cr23 C6 precipitations in the grain boundary after VIM of GH690-Re high temperaure alloy. The surface grain sizes became smaller and the microstructure was equiaxed austenite after ESR. The central area microstructure was small and short den- dritic crystal. The compositon was optimized by ESR. Further, the alloys reached a lower C content and Crz3C6 precipitation was not found in the grain boundary. So the hot-working character was improved.

关 键 词：熔炼工艺 组织和成分 枝晶 GH690合金 

分 类 号：TG243[金属学及工艺—铸造]