Si对9Cr型铁素体/马氏体钢析出相和力学性能的影响

doi:10.11901/1005.3093.2022.596

材料研究学报

2023, Vol. 37

Issue (11): 818-826 DOI: 10.11901/1005.3093.2022.596

研究论文

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Si对9Cr型铁素体/马氏体钢析出相和力学性能的影响

李峰¹^,²^,³, 汪建强¹^,², 陈慧琴³, 孙明月¹^,²(

), 徐斌¹^,², 刘朝晖¹^,²

^1.中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳 110016
^2.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
^3.太原科技大学材料科学与工程学院太原 030024

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

LI Feng¹^,²^,³, WANG Jianqiang¹^,², CHEN Huiqin³, SUN Mingyue¹^,²(

), XU Bin¹^,², LIU Zhaohui¹^,²

^1.Key Laboratory of Nuclear Materials and Safety, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.Shenyang National Research Center for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Taiyuan University of Science and Technology, School of Materials Science and Engineering, Taiyuan 030024, China

引用本文:

李峰, 汪建强, 陈慧琴, 孙明月, 徐斌, 刘朝晖. Si对9Cr型铁素体/马氏体钢析出相和力学性能的影响[J]. 材料研究学报, 2023, 37(11): 818-826.
Feng LI, Jianqiang WANG, Huiqin CHEN, Mingyue SUN, Bin XU, Zhaohui LIU. Effect of Si on Precipitation Behavior of Precipitated Phases and Mechanical Property of 9Cr-type Ferritic/Martensitic Steel[J]. Chinese Journal of Materials Research, 2023, 37(11): 818-826.

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摘要:

研究了Si含量对9Cr型铁素体马氏体 (F/M) 钢析出相和力学性能的影响。结果表明：在不同Si含量的9Cr型F/M钢中析出相均为M₂₃C₆、MX和Laves相，Si能促进Laves相和M₂₃C₆型碳化物的析出。Si含量为0.9%~1.2%的这种钢其拉伸强度和延伸率略有降低，冲击性能维持稳定；Si含量为1.2%~1.8%时，Si的固溶强化和析出相的沉淀强化使钢的拉伸强度提高。但是，随着Si含量的进一步提高Laves相和M₂₃C₆型碳化物大量析出，使其冲击功显著衰退。

关键词 ：金属材料, 铁素体/马氏体钢, Si含量, 析出相, 拉伸强度, 冲击性能

Abstract：

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℃ for 30 min, and then air cooling after tempering at 760℃ 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 M₂₃C₆, MX and Laves phases, and the presence of Si can promote the precipitation of Laves phase and M₂₃C₆ 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 M₂₃C₆ type carbide precipitates a lot, and the impact energy decreases significantly.

Key words： metallic materials ferritic martensitic steel Si content precipitates tensile strength impact property

收稿日期: 2022-11-10

ZTFLH:

TG142.1

基金资助:国家重点研发计划(2018YFA0702900);中核集团领创科研项目(E24L809);中国科学院金属研究所创新基金(2022-PY12)

通讯作者: 孙明月，研究员，mysun@imr.ac.cn，研究方向为金属构筑成形技术

Corresponding author: SUN Mingyue, E-mail: mysun@imr.ac.cn

作者简介: 李峰，男，1997年生，硕士生

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表1 不同Si含量F/M钢的实测化学成分

图1 不同Si含量F/M钢的背散射电子图像

表2 Laves相元素扫描结果

图2 不同Si含量F/M钢中析出相的二次电子图像

图3 F/M钢中析出相的TEM图像

图4 1.2Si钢中典型析出相的EDS面分布

图5 1.2Si钢的中杆状析出相和其中选定区域的高分辨图像和选区电子衍射

图6 F/M钢中M23C6的平均长度和面积分数

图7 F/M钢的室温拉伸性能

图8 F/M钢的室温冲击性能

图9 不同Si含量F/M钢冲击断口的二次电子图像

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