Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第2期    总第203期    2016年2月

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文章编号:1004-0609(2016)02-0302-08
钽含量对Co-Al-W合金强化相和高温氧化行为的影响
徐仰涛1, 2,沙岐振1, 2,夏天东1, 2

(1. 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050;
2. 兰州理工大学材料科学与工程学院,兰州 730050
)

摘 要: Co-Al-W合金是一种由γ′-Co 3(Al,W)相沉淀强化的新型钴基高温合金,为了研究微合金化元素钽对Co-8.8Al-9.8W(摩尔分数,%)合金强化相和高温氧化行为的影响,运用d电子合金设计理论和XRD分析方法研究Co-8.8Al-9.8W-xTa (x=0、0.5、1、1.5、2)合金的相组成、γ′强化相的数量及μ相的析出行为;运用SEM和EDAX等方法研究合金高温氧化膜的组成、显微组织结构和元素分布,并计算合金的氧化激活能。结果表明:钽元素含量增加,合金中γ′强化相的数量增多,对μ相析出的抑制程度增加。Co-8.8Al-9.8W-xTa合金的氧化膜主要由3层组成,最外层主要为钴的氧化物,中间过渡层为钨、铝和钽的复杂氧化物,最内层主要为铝的氧化物。钽元素提高合金氧化膜最内层中铝氧化物的致密性和稳定性。1.5Ta合金的氧化膜具有最佳的致密度和稳定性,氧化激活能最高,抗氧化能力最强。

 

关键字: Co-Al-W合金;高温氧化;激活能;氧化膜;钽

Effects of tantalum content on strengthening phase and high temperature oxidation behavior of Co-Al-W superalloy
XU Yang-tao1, 2, SHA Qi-zhen1, 2, XIA Tian-dong1, 2

1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metal,
Lanzhou University of Technology, Lanzhou 730050, China;
2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Abstract:With the precipitation strengthening phase of ternary compound γ′-Co3(Al,W), Co-Al-W superalloy is a novel cobalt-based superalloy. In order to study the effects of alloying element tantalum on the strengthening phase and high temperature oxidation behavior of Co-8.8Al-9.8W superalloy, the phase composition, the amount of strengthening phase and precipitation behavior of μ phase of Co-8.8Al-9.8W superalloy with different tantalum contents were investigated with d electrons alloy design theory and XRD analysis. Then the composition, microstructure and element distribution of the high temperature oxide films of Co-8.8Al-9.8W superalloy with different tantalum contents were studied by SEM and EDAX methods. And the activation energy of Co-8.8Al-9.8W superalloy with different tantalum content was calculated. The results show that with tantalum content increasing, the number of γ′ strengthening phase of the Co-Al-W superalloy increases and the μ phase separation is inhibited. The oxide film of Co-8.8Al-9.8W-xTa (x=0, 0.5, 1, 1.5, 2) superalloy mainly consists of three layers, the outermost layer mainly is cobalt oxide, the intermediate layer is tungsten, aluminum and tantalum complex oxides, and the inner layer is made up of aluminum oxide. Tantalum element improves the density and stability of oxide film of aluminum oxide. The oxide film of 1.5Ta superalloy has the best compactness and stability, and the 1.5Ta superalloy has the highest oxidation activation energy and the strongest antioxidant capacity.

 

Key words: Co-Al-W superalloy; high-temperature oxidation; activation energy; oxide film; tantalum

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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