FGH96合金静态再结晶过程的显微组织演化研究

doi:10.11900/0412.1961.2022.00540

金属学报 DOI: 10.11900/0412.1961.2022.00540

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FGH96合金静态再结晶过程的显微组织演化研究

彭子超¹ 罗俊鹏² 赵宇³ 周磊¹ 王旭青¹ 邹金文¹

1 中国航发北京航空材料研究院先进高温结构材料重点实验室北京 100095

2 中国航发南方工业有限公司株洲 412002

3 中国航发湖南动力机械研究所株洲 412002

The evolution of microstrucutre during static recrystallization in FGH96 superalloy

PENG Zichao ¹, LUO Junpeng ², ZHAO Yu ³, ZHOU Lei ¹, WANG Xuqing ¹, ZOU Jinwen ¹

1 Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, AECC, Beijing 100095, China

2 AECC South Industry Co., Ltd., Zhuzhou 412002, China

3 AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China

全文: PDF(2913 KB)

摘要: 在1100°C~1260°C范围内对锻态FGH96合金进行固溶处理，然后采用EBSD及TEM分析FGH96合金静态再结晶过程中的显微组织演化规律，揭示FGH96合金静态再结晶机制及Σ3孪晶界的形成机理。结果表明，固溶温度会影响FGH96合金的晶粒度及晶界特征（小角度晶界、大角度晶界和Σ3孪晶界），且随着固溶温度提高，晶粒度及晶界特征呈现出特定的演化规律。FGH96合金的静态再结晶机制以亚晶形核长大机制为主，且在静态再结晶过程中，平行于（11-1）密排面的原子堆垛出现错排而形成层错，为了降低体系的自由能，后续在（11-1）密排面上堆垛的原子要以与该层错呈晶面对称的方式进行堆垛，以提高体系的对称性，降低体系能量，从而形成了Σ3孪晶界。

关键词 ： FGH96高温合金, 固溶温度, 再结晶, Σ3晶界

Abstract：FGH96 alloy, one of powder metallurgy (PM) nickel-based superalloys, was widely used in turbine disks of aero engines due to the excellent mechanical properties. For nickel-based superalloy, the properties were decided by the microstructure, therefore, the evolution of microstructure in FGH96 was always investigated. However, most investigations were carried on FGH96 superalloy with HIP process or HIP+HIF process. Recently, Hot Extrusion was widely used in FGH96 superalloy manufacture, but the study in HEX allloy was rarely. In this study, FGH96 superalloy were solution heat-treated at 1100°C~1260°C, and the evolution of microstructure was studied by OM, EBSD and TEM. The mechanism of static recrystallization and formation mechanism of Σ3 twin boundary were also revealed. It was found that the static recrystallization grain size and grain boundary (including Small Angle boundary, Large Angle boundary and Σ3 twin boundary) were deeply influenced by the solution temperature, and there was a particular correlation between microstrucutre evolution and solution temperature. At 1100°C~1260°C, it was proved that the static recrystallization in FGH96 alloy was mainly through the nucleation and growth of sub-grain. At the same time, during static recrystallization process, a large number of stacking faults formed at (11-1) close-packed plane which improved the free energy. Therefore, in order to reduce the free energy, subsequent atoms were stacked symmetrical to the stacking faults, and formed Σ3 twin boundary.

收稿日期: 2022-10-24

通讯作者: 彭子超

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引用本文:

彭子超罗俊鹏赵宇周磊王旭青邹金文. FGH96合金静态再结晶过程的显微组织演化研究[J]. 金属学报, 10.11900/0412.1961.2022.00540.

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https://www.ams.org.cn/CN/Y0/V/I/0

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