铸造技术2017，Vol.38Issue(6)：1288-1291,4.DOI:10.16410/j.issn1000-8365.2017.06.008
大型镍基高温合金铸件中初生M6C碳化物的分布规律
Distribution of Primary M6C Carbide in Large Nickel-based Superalloy Casting
摘要
Abstract
A large scale nickel-based superalloy casting was prepared by vacuum induction melting method.The macro morphology of the casting section was observed by macrocorrosion.The microstrcture of the cross section were observed and analyzed by OM,SEM and EDS.The results show that the macro region of the casting section is divided to chilled crystal zone,the columnar zone,equiaxed zone and the fine grain zone.The primary M6C carbide is enriched in the cold zone and its volume fraction is as high as 40.2％,while the volume fraction of M6C is sharply decreased to 6.5％,1.3％ and 0 in the equiaxed zone,the fine grain zone and columnar zone,respectively.The M6C component is relatively fixed in different regions,which includes 73.8％～78.5％ (mass fraction) of W and a small amount of Ni,Co,Cr.MC carbides is rich in Nb,Ta and Ti,which has a slightly higher content of W closed to the riser region.The composition of eutectic γ'is stable,which is no obvious difference in different regions.关键词
初生M6C/铸件/镍基高温合金Key words
primary M6C/casting/nickel-based superalloy分类
矿业与冶金引用本文复制引用
赵会彬,冯微,周同金..大型镍基高温合金铸件中初生M6C碳化物的分布规律[J].铸造技术,2017,38(6):1288-1291,4.
