Influence of aging heat treatment on microstructure and hardness of single crystal Ni3Al-base superalloy IC21

被引：12

作者：

Wei, Li ^{[1
]}

Zhang, Zhigang ^{[1
]}

Zhang, Heng ^{[1
]}

Li, Shusuo ^{[1
]}

Gong, Shengkai ^{[1
]}

机构：

[1] Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

来源：

2011 CHINESE MATERIALS CONFERENCE | 2012年 / 27卷

关键词：

gamma' phase; high-temperature aging treatment; microstructure; hardness; 3RD-GENERATION;

D O I：

10.1016/j.proeng.2011.12.557

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of high-temperature aging heat treatment on microstructure and hardness of single crystal Ni3Al-base superalloy IC21 were investigated. The results showed that the temperature and time of aging treatment had significant effect on the shape and the average size of gamma' precipitate as well as the hardness of the alloy. The average size and volume fraction of gamma' precipitate after 1320 degrees C/10h/Ar cooling+870 degrees C/32h/air cooling(AC) treatment were about 270nm and 63% respectively. The experimental results showed that the two-step aging treatment following the solution treatment significantly influenced the size and volume fraction of gamma' phase, i. e., through the treatment of 1320 degrees C/10h/Ar cooling +1060 degrees C/2h/AC+870./32h/AC the moderate size (about 450nm) and volume fraction (about 70%) of cubic gamma' phase obtained and the hardness of the alloy reached the maximum value of about 370HV. However, with the increase of the aging temperature or time the size and the volume fraction of gamma' precipitate increased and the morphology of the gamma' precipitate gradually changed from cubic shape to rod shape. It has been found that after 1320 degrees C/10h/Ar cooling +1120 degrees C/2h/AC+870 degrees C/32h/AC or 1320 degrees C/10h/Ar cooling +1060 degrees C/6h/AC+870 degrees C/32h/AC treatment the morphology of the gamma' precipitates obviously changed from cubic shape to rod shape and the hardness of the alloy decreased significantly. (C) 2011 Published by Elsevier Ltd.

引用

页码：1081 / 1088

页数：8

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