铸造技术2018，Vol.39Issue(1)：58-62,5.DOI:10.16410/j.issn1000-8365.2018.01.014
成分优化对617和740镍基合金铸态组织的影响
Effects of Composition Optimization on Microstructure of As-cast 617 and 740 Nickel-based Alloy
寇金凤 1聂义宏 1金嘉瑜 1王宝忠1
作者信息
- 1. 天津重型装备工程研究有限公司,天津300457
- 折叠
摘要
Abstract
Effects of composition optimization on microstructure of as-cast 617 and 740 nickel-based alloys were studied by OM,SEM and EDS.The results show that the dendrite arm spacing decreases for the 617 alloy after composition optimization while that increases for the 740 alloy,due to the change of the cooling rate derived from composition supercooling.The segregation coefficient of main positive segregation elements in 617 alloy has little change,while segregation of Nb and Si reduces in 740 alloys after composition optimization.The precipitated phase of 617 alloy is still ~ after optimization,the form becomes more dispersed and fine and the carbide precipitates primarily along the grain boundary.While G phase decreases obviously in 740 alloys after optimization and precipitated carbides at the grain boundary increase.The change of supercooling degree and precipitates of carbide derived from the composition optimization refine the grains greatly in both 617 and 740 alloys.关键词
617镍基合金/740镍基合金/成分优化/铸态组织Key words
617 nickel-based alloys/740 nickel-based alloy/composition optimization/casting microstructure分类
矿业与冶金引用本文复制引用
寇金凤,聂义宏,金嘉瑜,王宝忠..成分优化对617和740镍基合金铸态组织的影响[J].铸造技术,2018,39(1):58-62,5.
