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

doi:10.11901/1005.3093.2022.596

Chinese Journal of Materials Research

2023, Vol. 37

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

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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

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LI Feng, WANG Jianqiang, CHEN Huiqin, SUN Mingyue, XU Bin, LIU Zhaohui. Effect of Si on Precipitation Behavior of Precipitated Phases and Mechanical Property of 9Cr-type Ferritic/Martensitic Steel. Chinese Journal of Materials Research, 2023, 37(11): 818-826.

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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

Received: 10 November 2022

ZTFLH:

TG142.1

Fund: National Key R&D Program(2018YFA0702900);CNNC Leads the Scientific Research Project(E24L809);Innovation Fund of Institute of Metal Research, Chinese Academy of Sciences(2022-PY12)

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

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	LIU Zhaohui

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.596 OR https://www.cjmr.org/EN/Y2023/V37/I11/818

Table 1 Chemical composition of F/M steel with different Si content (atomic fraction, %)

Fig.1 Backscattered electron images of F/M steel with different Si content (a) 0.9Si, (b) 1.2Si, (c) 1.5Si, (d) 1.8Si

Table 2 Laves phase element scan results (atomic fraction, %)

Fig.2 Secondary electron images of precipitated phases in F/M steel with different Si content (a) 0.9Si; (b) 1.2Si; (c) 1.5Si; (d) 1.8Si

Fig.3 TEM images in F/M steel with different Si content (a) 0.9Si; (b) 1.2Si; (c) 1.5Si; (d) 1.8Si

Fig.4 Typical EDS surface distribution of precipitation phase of steel with 1.2Si

Fig.5 Rod-like precipitation phase in 1.2Si (a) and high-resolution images of the selected area and electron diffraction of the selected area in which (b)

Fig.6 Average length and area fraction of M₂₃C₆ in F/M steel

Fig.7 Room temperature tensile propert of F/M steel

Fig.8 Room temperature impact properties of F/M steel

Fig.9 Secondary electron images of impact fracture of F/M steel with different Si content (a)、(b) 0.9Si; (c)、(d) 1.2Si; (e)、(f) 1.5Si; (g)、(h) 1.8Si

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