铸造技术2026，Vol.47Issue(4)：434-441,8.DOI:10.16410/j.issn1000-8365.2026.5184
Zr元素对DD416单晶高温合金叶片疏松缺陷的影响
Effects of Zr on the Microporosity Defects of DD416 Single Crystal Superalloy Blades
摘要
Abstract
To simulate the microporosity defects of single-crystal blades with Zr contents of 0.001 wt.％,0.003 wt.％,0.007 wt.％and 0.012 wt.％,the first-generation nickel-based single crystal superalloy DD416 and its blades were used as the research objects.The simulation results reveal that the microporosity defects are distributed mainly at the blade edge plate and that their content decreases first but then increases with increasing Zr.The experimental results and simulation results show essentially the same trend,and the experiments reveal that when the Zr content is 0.007 wt.％,the porosity defects of the DD416 single-crystal blade are the lowest.An examination of the reasons for this phenomenon reveals that when the Zr content increases from 0.001 wt.％to 0.007 wt.％,the change in primary dendrite spacing is the main factor influencing the formation of microporosity defects.An increase in the Zr content leads to an increase in the diffusion activation energy of solutes during the solidification process of the blades and a decrease in the diffusion coefficient,thereby decreasing the primary dendrite spacing and ultimately lowering the content of microporosity defects.The porosity defect content in the experimental results decreases from 0.463％in 10Zr to 0.064％in 70Zr.However,when the Zr content increases from 0.007 wt.％to 0.012 wt.％,the main influencing factors for microporosity defects are the volume fraction of the γ/γ'eutectic phase and the solidification range.The content of the eutectic structure further increases,the solidus temperature of the alloy decreases,and the solidification range expands,resulting in an increase in microporosity.The porosity content in the experimental results increased to 0.493％.关键词
DD416高温合金/微量元素Zr/单晶叶片/疏松缺陷Key words
DD416 superalloy/minor alloying element Zr/single crystal blades/microporosity defect分类
矿业与冶金引用本文复制引用
胡生垚,杨文超,张彦超,张剑,郭敏,杨敏,苏海军,刘林..Zr元素对DD416单晶高温合金叶片疏松缺陷的影响[J].铸造技术,2026,47(4):434-441,8.基金项目
国家自然科学基金(52322410) （52322410）
中国航发北京航空材料研究院校企合作项目(2021-01-2805-WX) （2021-01-2805-WX）
