铌基合金高温强化的研究  

Study on High-Temperature Strengthening of Nb-Based Alloy

作　　者：付洁[1] 郑欣[1] 李中奎[1] 张廷杰[1] 

机构地区：[1]西北有色金属研究院新材料研究所,陕西西安710016

出　　处：《稀有金属》2008年第5期548-551,共4页Chinese Journal of Rare Metals

摘　　要：研究了一种用于高温结构材料的铌基合金及其高温强化方法。经过试验,总结出两种强化方法:一是固溶强化,通过添加高熔点的W,Mo元素,形成合金化固溶体,从而提高了材料的高温蠕变性能;二是时效强化,通过加入C和Zr元素生成碳化物强化相,并研究C,Zr元素含量、热处理工艺及压力加工方法对时效强化的影响,分析得知,C含量控制在0.01%～0.13%,可以得到适量的碳化物强化相,在1600～1900℃下保温6～18h热处理,可以使碳化物均匀分布,大变形量的压力加工方法可以使碳化物强化相进一步破碎,从而细化。经上述方法强化处理后的材料,其高温性能测试结果证实,此方法效果较为显著。A kind of Nb-based alloy was used as hightemperature structural materials and its high-temperature strengthening methods were mainly studied in present paper. Two methods were summarized depending on many experiments. One was called solid solution strengthening, i.e. W and Mo were added in the Nb based alloy to form alloying solid solution in order to improve its high-temperature creep properties. The other one was aging strengthening, i.e. C and Zr were added in the alloy to form carbide strengthening phase. And the effect of C and Zr content and processes of heat treatment and press-working on aging strengthening was also investigated. The results showed that proper carbide strengthening phases could be obtained, when C content was controlled in the range between 0. 01% and 0. 13%. The carbide would distribute uniformly, when heat treatment was carried out at 1600 - 1900 ℃ for 6 - 8 h. And carbide strengthening phases would be further broken by large deformation for refinement. The high-temperature performances of the materials strengthened by the two methods were tested to be remarkable.

关 键 词：铌合金 固溶强化 时效强化 高温性能 

分 类 号：TG146.416[一般工业技术—材料科学与工程]