低成本二代镍基单晶高温合金的研究进展
Research progress of low cost second-generation Ni-based single crystal superalloys
艾诚 1李凯文 1郭敏 2黄太文 2刘林2
作者信息
- 1. 长安大学 材料科学与工程学院,西安 710064
- 2. 西北工业大学 凝固技术国家重点实验室,西安 710072
- 折叠
摘要
镍基单晶高温合金因其优异的高温力学性能,目前已广泛应用于制备航空发动机中的单晶涡轮叶片.Re元素的添加在显著提高单晶高温合金蠕变性能的同时,也显著增加了合金的成本.因此,研发新型低Re含量(低成本)和蠕变性能优异的单晶高温合金具有重要的意义.本文对比了几种低成本二代单晶高温合金与典型二代单晶高温合金CMSX-4的中温与高温蠕变性能,并从γ相和γ'相的固溶强化程度、γ/γ'错配度和有效扩散系数三个参量,探讨了二代单晶高温合金中温与高温蠕变性能的主控因素,发现高温蠕变性能的主控因素是γ相的固溶强化程度与γ/γ'错配度,而中温蠕变性能的主控因素是γ'相的固溶强化程度.以此为基础,提出了低成本二代单晶高温合金的成分设计策略.
Abstract
Due to their excellent high temperature mechanical properties,Ni-based single crystal superalloys have been widely used in the preparation of single crystal turbine blades in aeroengines.The addition of Re element significantly improves creep properties of single crystal superalloys.However,Re addition significantly increases the cost of single crystal superalloys.Therefore,it is of great significance to design new type single crystal superalloys with low Re content(low cost)and excellent creep properties.In this paper,the medium temperature and high temperature creep properties of several low-cost second-generation single crystal superalloys and typical second-generation single crystal superalloy CMSX-4 were compared.Meanwhile,main controlling factors of medium temperature and high temperature creep properties of second-generation single crystal superalloys were analyzed from three aspects:solid solution strengthening degree of γ and γ' phases,γ/γ' misfit and effective diffusion coefficient.The main controlling factors of high temperature creep properties are solid solution strengthening degree of γ phase and γ/γ' misfit,while the main controlling factors of medium temperature creep properties are solid solution strengthening degree of γ' phase.Based on this rule,the alloy design strategy for low-cost second-generation single crystal superalloys was proposed.
关键词
低成本单晶高温合金/蠕变性能/固溶强度程度/γ/γ'错配度/有效扩散系数Key words
low cost Ni-base single crystal superalloy/creep property/solid solution strengthening degree/γ/γ'misfit/effective diffusion coefficient引用本文复制引用
基金项目
国家自然科学基金资助项目(51701020)
陕西省重点研发计划资助项目(2024GX-YBXM-345)
中央高校基本科研业务费资助项目(300102313101)
出版年
2024
NETL
NSTL
万方数据