中南大学学报（自然科学版）2025，Vol.56Issue(2)：478-486,9.DOI:10.11817/j.issn.1672-7207.2025.02.007
第三代单晶高温合金WZ30的凝固组织研究
Study on solidification microstructure of a third generation single crystal superalloy WZ30
摘要
Abstract
The single crystal(SC)bars of the third-generation SC superalloy WZ30 were prepared by spiral grain selector method.The as-cast microstructure was examined.The element segregation in castings was analyzed by scanning electron probe(EPMA)across a dendritic arm.The segregation coefficients of various alloying elements in WZ30 castings were evaluated and compared with that of the second-generation alloy CMSX-4.The results show that in alloy WZ30 the freckling extent becomes more pronounced and the eutectic fraction is significantly higher than that in alloy CMSX-4.According to EBSD detection result,the crystal orientation of γ/γ'eutectic islands is consistent with that of γ matrix,indicating that the eutectic nucleates on the γ dendrite as matrix.The distribution of elements in the dendrite arms is not a continuous gradient,but a stepped abrupt variation,indicating that the growth of dendrite arms during solidification is carried out in stages.Due to the more addition of refractory element Re,the segregation tendency of the most alloying elements in WZ30 becomes more severe,leading to an increase in eutectic fraction and a higher freckling tendency.关键词
第三代单晶高温合金/定向凝固/微观组织/共晶/元素偏析Key words
the third generation single crystal superalloy/directional solidification/microstructure/eutectic/element segregation分类
矿业与冶金引用本文复制引用
赵运兴,马德新,魏剑辉,员莹莹,徐维台,李侣,邓阳丕..第三代单晶高温合金WZ30的凝固组织研究[J].中南大学学报（自然科学版）,2025,56(2):478-486,9.基金项目
深圳市科技计划项目(JSGG20220831092800001) （JSGG20220831092800001）
广东省引进创新创业团队项目(607264877417)(Project(JSGG20220831092800001)supported by the Shenzhen Science and Technology Program （607264877417）
Project(607264877417)supported by Guangdong Innovative and Entrepreneurial Research Team Program) （607264877417）
