Effect of cold deformation on precipitation after high temperature aging of an alumina forming austenitic steel

被引：1

作者：

Sun G. ^{[1
]}

Zheng J. ^{[2
]}

Zhou Z. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing

[2] Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 01期

基金：

中国国家自然科学基金;

关键词：

aging; alumina forming austenitic steel; cold deformation; mechanical property; precipitates;

D O I：

10.11817/j.issn.1672-7207.2023.01.006

中图分类号：

学科分类号：

摘要：

The effect of different cold deformation(0, 20% and 50%) on the microstructure and mechanical property evolution of a solid solution alumina forming austenitic(AFA) steel after aging at 650 ℃ for 120 h was investigated. The results show that as the amount of cold deformation increases from 0 to 20%, the dislocation density increases obviously. When the cold deformation further increases to 50%, the dislocation density increases slightly. NiAl precipitates in the grain interior for all the three aged samples. The increase of deformation level promotes the amount of NiAl precipitates. Cold deformation with 20% level can coarsen the size of NiAl phase slightly, and when the cold deformation increases to 50%, the size of NiAl phase is refined slightly. Coarse Cr23C6 precipitates at the grain boundary in the three aged samples. The cold deformation also promotes the precipitation of the Laves phase and NiAl phase in grain boundary, but the precipitation amount of Laves phase in the grain interior is less. The room temperature strength of the sample steel increases obviously with the increase of cold deformation, while the plasticity of steel sample decreases. At high temperature, the strength of 50% cold deformed sample is lower than that of 20% cold deformed sample, but it still maintains good plasticity. In conclusion, the 20% cold deformed alloy shows good tensile property. © 2023 Central South University of Technology. All rights reserved.

引用

共 27 条

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