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金属学报  2019, Vol. 55 Issue (9): 1211-1220    DOI: 10.11900/0412.1961.2019.00121
  研究论文 本期目录 | 过刊浏览 |
服役条件下镍基高温合金应力松弛微观机制
江河(),董建新,张麦仓,姚志浩,杨静
北京科技大学材料科学与工程学院 北京 100083
Stress Relaxation Mechanism for Typical Nickel-Based Superalloys Under Service Condition
JIANG He(),DONG Jianxin,ZHANG Maicang,YAO Zhihao,YANG Jing
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
全文: PDF(38878 KB)   HTML
摘要: 

以4种典型镍基高温合金(GH4169、GH4169D、GH4738、GH350)为研究对象,在600~780 ℃和260~510 MPa范围内对其进行应力松弛实验,并利用FESEM和TEM对应力松弛后的样品进行组织观察分析,系统研究了典型镍基高温合金服役条件下应力松弛的微观机制。结果表明,在应力松弛实验过程中应力在开始阶段快速下降后趋于稳定;合金的松弛稳定性随着温度的升高而降低。应力松弛实验中试样的形貌不发生明显改变,而TEM分析表明应力松弛的主要微观机制是位错的运动和析出相对位错运动的阻碍。合金中析出相的种类、尺寸、形态和分布影响了析出相对位错运动阻碍作用的大小,从而决定了合金的应力松弛性能。

关键词 高温合金应力松弛组织演变机制    
Abstract

Since nickel-based superalloys are more and more used as fasteners, it is necessary to investigate the stress relaxation behavior and mechanism of nickel-based superalloy. In present work, the stress relaxation mechanism for four typical nickel-based superalloys (GH4169, GH4169D, GH4738, GH350) for fasteners under service condition was investigated. The stress relaxation tests were carried out according to GB/T 10120-2013 in the temperature range of 600~780 ℃ and initial stress range of 260~510 MPa, and the stress relaxation curves were recorded. The microstructure was studied by FESEM and TEM. The results show that the stress decreases fast in the initial stage of stress relaxation test and then trends to be steady. The stress relaxation stability decreases with increasing temperature. There is no apparent change in the microstructure after stress relaxation test. TEM observation shows that the major mechanism of stress relaxation is the movement of dislocations, and the stress relaxation properties of different alloys depend on the inhibition of dislocation movement. The species, size, shape and distribution of phases determine the ability to hinder dislocation movement and the stress relaxation property of different alloys. GH4169 alloy gets the stress relaxation property mainly by γ' phase, γ'' phase and δ phase hindering the movement of dislocations. In GH4169D alloy, both γ' phase and η phase participate in the stress relaxation process. γ' phase in GH4738 alloy can effectively impede the movement of dislocations and provide good stress relaxation property. The combined effect of γ' phase and η phase guarantees the stress relaxation stability of GH350 alloy.

Key wordssuperalloy    stress relaxation    microstructure evolution    mechanism
收稿日期: 2019-04-18     
ZTFLH:  TG146.1  
基金资助:国家自然科学基金项目(51771016)
通讯作者: 江河     E-mail: jianghe@ustb.edu.cn
Corresponding author: He JIANG     E-mail: jianghe@ustb.edu.cn
作者简介: 江 河,女,1988年生,博士

引用本文:

江河,董建新,张麦仓,姚志浩,杨静. 服役条件下镍基高温合金应力松弛微观机制[J]. 金属学报, 2019, 55(9): 1211-1220.
He JIANG, Jianxin DONG, Maicang ZHANG, Zhihao YAO, Jing YANG. Stress Relaxation Mechanism for Typical Nickel-Based Superalloys Under Service Condition. Acta Metall Sin, 2019, 55(9): 1211-1220.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00121      或      https://www.ams.org.cn/CN/Y2019/V55/I9/1211

图1  应力松弛实验样品和典型应力松弛曲线
AlloyCoCrMoTiAlNbTaWCFeNi
GH4169-19.003.001.000.505.30--0.0518.20Bal.
GH4169D8.9819.122.810.751.655.51--0.0399.50Bal.
GH473812.9019.004.422.901.45---0.04-Bal.
GH35024.7716.902.992.201.081.203.951.97<0.02-Bal.
表1  实验用合金化学成分
图2  不同合金的应力松弛曲线
图3  应力松弛实验前后合金的典型显微组织
图4  GH4738合金应力松弛实验后TEM明场像
图5  GH4169合金应力松弛实验后TEM明场像
图6  GH4169D合金在700 ℃、510 MPa应力松弛实验后的TEM明场像
图7  GH350合金应力松弛实验后TEM明场像
图8  GH4169合金在650 ℃不同初应力条件下应力松弛实验后TEM明场像
图9  GH4169合金在650 ℃、1020 MPa条件下未达到稳态的应力松弛曲线及典型显微组织的TEM明场像
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