摘要
分析了铌基高温合金的显微组织,研究了该合金的时效强化机理及其高温性能。按设计成分配制的合金粉末在"V"形混料桶中混合,冷等静压成型,压坯在真空烧结炉中烧结后,经一次电子束熔炼和二次真空自耗电弧熔炼的铸锭再经挤压得到棒材,最后轧制成板材。通过金相、SEM和TEM分析,及高温拉伸、蠕变试验分析的结果表明:Zr和C元素生成碳化物沉淀相对铌基体有时效强化作用,热塑性加工在很大程度上改变了碳化物的分布,Zr元素的加入对改善合金组织结构和提高合金的高温性能起到了重要的作用。
This paper analysed the microstructure of Niobium-base super-alloys, and studied their age hardening mechanism and high temperature properties. The alloy-powder were mixed in ＂V＂ shape barrel according to designed composition, by cold isostatic pressing, sintering in the vacuum sintering furnace, one time electron beam melting and two time vacuum self-consuming arc melting; the obtained ingots were extruded bars, and finally obtained plates by rolling. Through metallography, SEM, TEM, high temperature tensile test and creep test analysis, the results show that Zr and C elements generate carbide deposit phases, which can age harden the Nb-matrix; thermoplastic processing, to a great extent, can change the carbide distribution; Zr elements has played an important role to improve the microstructure and high temperature properties of the alloy.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A04期618-621,共4页
Rare Metal Materials and Engineering
关键词
铌基高温合金
时效强化
碳化物
高温性能
Niobium-base super-alloys age hardening carbide high temperature properties
