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14卷    第5期    总第62期    2004年5月

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文章编号:1004-0609(2004)05-0713-05
高温精炼处理对铸造镍基高温合金组织与
性能的影响
王建明1, 2, 袁  超3,牛建平1, 才庆魁1, 2, 胡壮麒3

( 1. 沈阳大学 机械工程学院, 沈阳 110044; 
2. 东北大学 材料与冶金学院,沈阳 110004;
3. 中国科学院 金属研究所,沈阳 110016
)

摘 要: 研究了高温精炼处理对铸造镍基高温合金组织与性能的影响。普通铸造镍基合金枝晶组织粗大, 晶界碳化物呈链状分布, 晶内碳化物呈草体汉字状密集分布于枝晶间, 是合金塑性低的主要原因。 经高温精炼处理后, 合金的枝晶组织细化,晶界及枝晶间的碳化物数量减少, γ+γ′共晶相数量增加, 晶界碳化物呈不连续质点状分布, 晶内碳化物的密集程度下降, 拉伸塑性和蠕变(持久)寿命得以明显提高。经1650℃, 5min高温熔体处理后, 合金室温延伸率由3.5%提高到9.2%, 700℃高温塑性由2.0%提高到8.0%, 900℃高温塑性由2.8%提高到9.6%, 蠕变寿命由34h提高到52h, 蠕变塑性由4.3%提高到6.11%。 推荐的最佳高温精炼处理制度为1650℃保温4h。 分析了高温精炼处理对合金液态结构、 凝固组织与性能的影响机理。 

 

关键字: 高温精炼处理; 铸造镍基高温合金; 组织; 力学性能

Effect of melt superheating treatment on microstructure and mechanical properties of cast nickel-base superalloy
WANG Jian-ming1, 2, YUAN Chao3, NIU Jian-ping1
CAI Qing-kui1, 2, HU Zhuang-qi3

1. School of Mechanical Engineering, Shenyang University, Shenyang 110044, China;
2. School of Materials and Metallurgy, 
Northeastern University, Shenyang 110004, China;
3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Abstract: The effects of the melt superheating treatment on the microstructure and mechanical properties of a cast nickel-base superalloy were investigated. A large amount of coarse or needle-like carbides within the grain interior or at grain boundary in this alloy as conventional cast, is very harmful to the mechanical properties. It is suggested that the melt superheating treatment at high temperature can be conducive to the improvement of the ductility of the alloy. The results show that the microstructure of the alloy can be significantly influenced by the melt superheating treatment, that is, the dendritic structure is refined, and the amount of carbides is reduced. Consequently, after treated at 1650℃ for 5min, tensile ductility of cast alloy is increased remarkably from 3.5% to 9.2% at room temperature, from 2.0% to 8.0% at 700℃ and from 2.4% to 9.6% at 900℃, respectively, without loss of its high strength. Meanwhile, the creep life of superalloy lower than 225MPa at 975℃ is also improved obviously.

 

Key words: melt superheating treatment; cast nickel-base superalloy; microstructure; mechanical property

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

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

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