一种GH4169镍基合金的组织结构与蠕变性能

doi:10.11868/j.issn.1001-4381.2015.001145

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摘要

通过对一种等温锻造GH4169镍基合金进行直接时效处理，蠕变性能测试及组织形貌观察，研究了该合金的组织结构与蠕变行为。结果表明，GH4169合金的组织结构由γ基体，γ'相、γ"相和δ相组成，且各相之间保持共格界面。测定出合金在660℃/700MPa条件下的蠕变寿命为123h。合金在680℃/700MPa的蠕变寿命为39h，在实验温度和应力范围内，计算出直接时效合金的蠕变激活能为588.0kJ/mol。合金在蠕变期间的变形机制是位错滑移和孪晶变形，其中，沿晶界析出的粒状碳化物，可抑制晶界滑移，是使合金具有较好蠕变抗力的主要原因。随蠕变进行，开动的滑移系中位错运动至晶界受阻，并塞积于该区域引起应力集中，当应力集中值大于晶界的结合强度时，可促使其在与应力轴垂直的晶界处发生裂纹的萌生与扩展，直至断裂，是合金在蠕变期间的断裂机制。

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	刘臣
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关键词 ： GH4169合金, 组织结构, 蠕变, 变形机制, 损伤特征

Abstract：

By means of direct aging (DA) heat treatment, creep properties measurement and microstructure observation, the microstructure and creep behaviors of the GH4169 superalloy were investigated. Results show that the microstructure of the alloy consists of γ, γ', γ" and δ phases, and the coherent interfaces exist between the phases. The creep life of the alloy at 660℃/700 MPa is predicted to be 123h, and 39h at 680℃/700MPa. Under the testing temperature and stress range, the creep activation energy of the alloy is calculated to be 588.0 kJ/mol. The deformation mechanisms of the alloy during creep are dislocation slipping and twin deformation. The granular carbides precipitated along the grain boundaries may restrain the slipping of the boundary, which is thought to be the main reason of the good creep resistance. As the creep goes on, the slipping dislocations activated within the grains are hindered and blocked by the boundaries to cause the stress concentration, which may promote the initiation and propagation of the crack occurring along the boundaries perpendicular to the stress axis, when the value of stress concentration is higher than the bonding strength of the boundaries, up to the occurrence of creep fracture. This is thought to be the fracture mechanism of alloy during creep.

Key words： GH4169 superalloy microstructure creep deformation mechanism damage feature

收稿日期: 2015-09-18 出版日期: 2017-06-20

中图分类号:

TB35

基金资助:国家自然科学基金项目(50634030)

通讯作者: 田素贵 E-mail: tiansugui2003@163.com

作者简介: 田素贵 (1952-), 男, 教授, 博士, 主要从事高温合金的研究, 联系地址:辽宁省沈阳市经济技术开发区沈辽西路111号沈阳工业大学材料科学与工程学院 (110870), E-mail:tiansugui2003@163.com

引用本文:

刘臣, 田素贵, 王欣, 吴静, 梁爽. 一种GH4169镍基合金的组织结构与蠕变性能[J]. 材料工程, 2017, 45(6): 43-48.
Chen LIU, Su-gui TIAN, Xin WANG, Jing WU, Shuang LIANG. Microstructure and Creep Property of a GH4169 Nickel-based Superalloy. Journal of Materials Engineering, 2017, 45(6): 43-48.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.001145 或 http://jme.biam.ac.cn/CN/Y2017/V45/I6/43

Table 1 GH4169合金的化学成分 (质量分数/%)

Fig.1 直接时效GH4169合金在不同条件下测定的蠕变曲线
(a) 经不同温度施加700MPa测定的蠕变曲线；(b)660℃施加不同应力测定的蠕变曲线

Fig.2 ITF-DA-GH4169合金的组织形貌

Fig.3 ITF-GH4169合金经直接时效处理后的微观组织形貌 (a)δ相沿晶界析出形貌；(b)γ′，γ″相在γ基体的形貌

Fig.4 合金经660℃/700MPa蠕变100h的组织形貌

Fig.5 ITF-DA-GH4169合金在680℃/700MPa蠕变断裂后的微观组织形貌 (a) 粒状δ相沿晶界析出；(b) 孪晶和位错滑移；(c) 位错在晶界处聚集的形貌

Fig.6 ITF-DA-GH4169合金在680℃/700MPa蠕变断裂后的表面滑移迹线
(a) 试样表面的滑移迹线；(b) 试样的滑移机制

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