Effect of Thermal Aging on Mechanical Properties of Silicon-containing Ferritic/Martensitic Steel

被引：0

作者：

Liu X. ^{[1
]}

Wang H. ^{[1
]}

Xiao J. ^{[1
]}

Sun Y. ^{[1
]}

Liu S. ^{[2
]}

Zhang J. ^{[2
]}

机构：

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

[2] State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an

来源：

Hedongli Gongcheng/Nuclear Power Engineering | 2023年 / 44卷

关键词：

Ferritic/Martensitic (F/M) Steel; Laves phase; Mechanical properties; Microstructure; Thermal aging;

D O I：

10.13832/j.jnpe.2023.S1.0147

中图分类号：

学科分类号：

摘要：

Four kinds of 9Cr-ferritic/martensitic (F/M) steels with different Si contents were heat aged at 550°C (the longest time was 5000 h), and their mechanical properties such as yield strength (Rp0.2), tensile strength (Rm) and elongation (A) were tested. The relationship between microstructure and mechanical properties was studied by means of scanning electron microscope/energy dispersive spectrometer (SEM/EDS) and transmission electron microscope (TEM). The results show that the strength of 9Cr-F/M steel can be improved by adding a small amount of Si, and when the Si content (mass fraction) is 0.7%, Rp0.2 and Rm reach the maximum, but the addition of Si will promote Laves phase precipitation. Aging time (t) has a significant effect on the plasticity of 9Cr-F/M steel. When t < 2500 h, the plasticity of 9Cr-F/M steel has little change, but when the Si content is increased to 1.0%, the plasticity decreases greatly after aging for 5000 h, which is attributed to the precipitation and growth of Laves phase at the grain boundary. © 2023 Yuan Zi Neng Chuban She. All rights reserved.

引用

页码：147 / 151

页数：4

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