合金成分对含铼镍基单晶合金高温持久及断裂性能的影响  

Effects of Composition on High Temperature Rupture and Fracture Feature of Recontaining Nibased Single Crystal Superalloys

作　　者：魏朋义[1] 钟振刚[1] 桂钟楼 刘荣敏 劳日玲 李嘉荣[1] 

机构地区：[1]北京航空材料研究院

出　　处：《材料工程》1999年第4期3-6,46,共5页Journal of Materials Engineering

摘　　要：通过研究含铼镍基单晶合金主要合金化元素Ｗ，Ｒｅ，Ｔａ，Ａｌ，ＲＥ等含量变化对其高温（９８０～１１００℃）持久性能和持久断裂特征的影响，探索优化合金元素配比的基本原理，并分析其对持久断裂行为的影响。结果发现：适当提高Ｒｅ，Ｗ，Ｎｂ，Ｔａ，Ａｌ含量有利于高温持久性能改善，这些元素间存在互相抵消或补偿的效用，必须进行各元素含量匹配才能综合优化。适量添加稀土对改善合金持久蠕变的性能效果独特，从而证明利用其它合金元素部分代替铼的合理性。初步分析表明：以上效用归因于元素对合金相强化、相体积含量以及对持久蠕变动力学特别是γ′相熟化综合作用的结果。本文初步设计出含铼小于２．A new secondary generation Nibased single crystal superalloy containing only 2wt%Re was developed Effects of main alloying elements, W,Re,Ta,Al,RE ,on high temperatures(9801100)rupture properties and fracture surface characteristics of Recontaining Nibased single crystal superalloys were investigated to explore the principle for improving alloying and understand the fracture behavior in this series of alloy It is found that: increasing the contents of Re,W,Nb,Ta,Al,RE, to certain extent will contribute to improvement of high temperature rupture properties, and then it is turned out to be reasonable to decrease the necessary Re contents by matching of contents of elements other than Re, especially minor addition of RE Those results are due to individual and mutual effect on strengthening and volume fraction of alloy phases(,) and coarsening dynamics of phase during creep process

关 键 词：单晶 高温合金 持久蠕变 断裂 合金成份 铼镍基 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TG146.418[金属学及工艺—合金]