Effect of Si on Precipitation Behavior of Precipitated Phases and Mechanical Property of 9Cr-type Ferritic/Martensitic Steel

被引：0
|
作者：
Li F. [1 ,2 ,3 ]
Wang J. [1 ,2 ]
Chen H. [3 ]
Sun M. [1 ,2 ]
Xu B. [1 ,2 ]
Liu Z. [1 ,2 ]
机构：
[1] Key Laboratory of Nuclear Materials and Safety, Institute of Metal Research, Chinese Academy of Sciences, Shenyang
[2] Shenyang National Research Center for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang
[3] Taiyuan University of Science and Technology, School of Materials Science and Engineering, Taiyuan
来源：
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2023年 / 37卷 / 11期
关键词：
ferritic martensitic steel; impact property; metallic materials; precipitates; Si content; tensile strength;
D O I：
10.11901/1005.3093.2022.596
中图分类号：
学科分类号：
摘要：
Ferritic martensitic (F/M) steel is one of the main candidates for structural components of lead-bismuth fast reactors. Increasing the Si content can enhance the resistance of the material to Pb-Bismuth corrosion, but it also affects the precipitation behavior of precipitates and mechanical properties of the material. In this paper, four ingots of F/M steels with different Si contents (0.9%, 1.2%, 1.5% and 1.8% by mass fraction) were vacuum melted and cast, and then forged to generate blocks, afterwards, the steels were subjected to the following heat treatment process: water cooling after solution treatment at 1050°C for 30 min, and then air cooling after tempering at 760°C for 90 min. The effect of the Si addition on the precipitation behavior of precipitates and mechanical properties of 9Cr type F/M steel was carefully examined. The results show that the precipitated phases of 9Cr type F/M steel with different Si contents are М23C6, МХ and Laves phases, and the presence of Si can promote the precipitation of Laves phase and М23C6 carbide. When the Si content is 0.9%~1.2%, the tensile strength and elongation of the steel are slightly reduced, and the impact performance remains stable; when the Si content is 1.2%~ 1.8%, the solid solution strengthening of Si and the precipitation strengthening of the precipitates make the strength of the steel increase, but with the increase of Si content, Laves phase and М23C6 type carbide precipitates a lot, and the impact energy decreases significantly. © 2023 Chinese Journal of Materials Research. All rights reserved.
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页码：818 / 826
页数：8
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