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金属学报  2013, Vol. 49 Issue (7): 845-852    DOI: 10.3724/SP.J.1037.2012.00712
  论文 本期目录 | 过刊浏览 |
GH4169G合金热处理期间的相转变特征与机理分析
田素贵1),王欣1),谢君1),刘臣1),郭忠革),刘姣2),孙文儒2)
1)沈阳工业大学材料科学与工程学院, 沈阳 110870
2)中国科学院金属研究所高温合金研究部, 沈阳 110016
 
CHARACTERISTIC AND MECHANISM OF PHASE TRANSFORMATION OF GH4169G ALLOY DURING HEAT TREATMENT
TIAN Sugui1), WANG Xin1), XIE Jun1), LIU Chen1), GUO Zhongge1),LIU Jiao2), SUN Wenru2)
1)School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870
2)Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
全文: PDF(2881 KB)  
摘要: 

通过组织形态观察和XRD分析, 研究了热处理对GH4169G合金相组成和分布规律的影响.结果表明, 在实验条件下, 合金的组织结构由γ基体、粒状γ′相、圆盘状γ相和δ相组成, 且各相之间保持共格界面, 其中,直接时效处理ITF-DA-GH4169G合金由少量γ相、大量γ相和γ基体组成, 而长期时效处理ITF-DA-LTA-GH4169G合金由少量γ相、大量γ相和γ相及针状δ相组成. 时效期间,随着合金中Nb原子扩散进入γ相, 使γ相(001)面的Nb和Ni原子沿1/2<110>方向迁移, L12结构的γ-Ni3Al相可转变成DO22结构的γ-Ni3Nb相. 随时效时间延长, γ相长大,γ相单胞中的平行六面体沿特定晶面发生1/6<112>位移,促使γ相转变成DOa结构的δ-Ni3Nb. 其中,γ相中的a, b轴与γ基体和γ相保持共格界面,可使其沿c轴生长成为圆盘状形态; 而δ-Ni3Nb相的{200}δ晶面与γ基体的{111}γ晶面保持共格界面, 是促使δ相沿(100)晶面生长成为针状的主要原因.

关键词 GH4169G合金热处理组织结构晶格常数相转变    
Abstract

By means of heat treatment at different regimes, microstructure observation and XRD analysis, an investigation has been made into the influence of heat treatment on the phases constitution and distribution regularity of GH4169G alloy. The results show that under the experimental conditions, microstructure of GH4169G alloy consists of γ matrix, particle-like γ′,disc-like γand δ phases, and the coherent interfaces are kept between the phases. Thereinto, microstructure of directional aging treatment ITF-DA-GH4169G alloy consists of a few γ′phase, lots of γ and γ phases, however, long-time aging treatment ITF-DA-LTA-GH4169G consists of a few γ′,lots of γ, γ and needle-like δ phases. As the Nb atom diffuses into the lattice of γ′  phase during the aging treatment,γ-Ni3Al phase with L12 structure is transformed intoγ-Ni3Nb phase with DO22 structure when the Nb and Ni atoms on (001) plane of γ′ phase migrate along 1/2<110> direction. With the growth of γ phase during the long term aging, the given crystal plane in the new parallelepiped migrates along the 1/6<112> direction, which makes the γ phase transform into δ-Ni3Nb phase with DOa structure. Moreover, the γ phase may grow up into the disc-like configuration along the c-axis direction due to the restriction of the a- and b-axis coherent interfaces. And it is a main reason that the δ-Ni3Nb phase grows into needle-like configuration along the (100) plane due to the {200}δ plane ofδ phase keeps coherent interface with {111}γ plane of γ matrix phase.

Key wordsGH4169G alloy    heat treatment    microstructure    lattice parameter    phase transformation
收稿日期: 2012-11-29     
基金资助:

国家自然科学基金重点基金项目50634030和国家自然科学基金项目51271125资助

通讯作者: 田素贵     E-mail: tiansugui2003@163.com
作者简介: 田素贵, 男, 1952年生, 教授

引用本文:

田素贵,王欣,谢君,刘臣,郭忠革,刘姣,孙文儒. GH4169G合金热处理期间的相转变特征与机理分析[J]. 金属学报, 2013, 49(7): 845-852.
TIAN Sugui, WANG Xin, XIE Jun, LIU Chen, GUO Zhongge, LIU Jiao, SUN Wenru. CHARACTERISTIC AND MECHANISM OF PHASE TRANSFORMATION OF GH4169G ALLOY DURING HEAT TREATMENT. Acta Metall Sin, 2013, 49(7): 845-852.

链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00712      或      https://www.ams.org.cn/CN/Y2013/V49/I7/845

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