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Acta Metall Sin  2020, Vol. 56 Issue (1): 53-65    DOI: 10.11900/0412.1961.2019.00146
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Preferential Distribution of Boron and its Effect on Microstructure and Mechanical Properties of (9~12)%Cr Martensitic Heat Resistant Steels
YANG Ke1,LIANG Ye1,2,YAN Wei1,3(),SHAN Yiyin1,3
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
3. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Abstract  

Addition of small amount of boron (B) in the (9~12)%Cr martensitic heat resistant steels can obviously prohibit the Ostwald ripening of M23C6 carbides so as to improve creep strength as well as creep rupture life. With the purpose of taking full advantages of B element, it is critical to make B preferentially distribute in (9~12)%Cr martensitic heat resistant steels. The mechanism of B preventing M23C6 carbides from ripening is also on the premise of clearly identifying the preferential distribution of B in the steels. Much concern has been growing over the preferential distribution of B in the research of (9~12)%Cr martensitic heat resistant steels. Therefore, this article gives a review on this aspect. Following a summary of the effect of B on mechanical properties, several commonly used characterizing methods for B segregation in the steels are introduced. Based on the physical metallurgy and the solution, diffusion mechanisms of B element, discussions on the preferential distribution of B element at prior austenite grain boundaries and in the M23C6 carbides as well as the related factors are emphasized. At last, two prevalent mechanisms of B restraining the coarsening of M23C6 carbides in (9~12)%Cr martensitic heat resistant steels are given by an intensive explanation so that the relationship between the preferential distribution of B and its advantage of increasing creep performance by suppressing the ripening M23C6 carbides are systematically elaborated, which gives a deep understanding of the role of B element in (9~12)%Cr martensitic heat resistant steels.

Key words:  martensitic heat resistant steel      B      segregation      M23C6 carbide      Ostwald ripening     
Received:  06 May 2019     
ZTFLH:  TG142.1  
Fund: National Key Research and Development Program of China(2017YFB0305201);National Natural Science Foundation of China(51971226)
Corresponding Authors:  Wei YAN     E-mail:  weiyan@imr.ac.cn

Cite this article: 

YANG Ke,LIANG Ye,YAN Wei,SHAN Yiyin. Preferential Distribution of Boron and its Effect on Microstructure and Mechanical Properties of (9~12)%Cr Martensitic Heat Resistant Steels. Acta Metall Sin, 2020, 56(1): 53-65.

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00146     OR     https://www.ams.org.cn/EN/Y2020/V56/I1/53

Fig.1  Distributions of B (a), V (b) and Cr (c) in G115 heat resistant steel after normalizing at 1100 ℃ for 1 h and tempering at 780 ℃ for 3 h
Fig.2  Boron distributions in G115 steel after normalizing at 1100 ℃ for 1 h and tempering at 780 ℃ for 3 h (a) and ageing at 650 ℃ (b), 700 ℃ (c) and 750 ℃ (d) for 1000 h
Fig.3  TEM image showing coarsed M23C6 carbide in G115 heat resistant steel after ageing at 700 ℃ for 1000 h
Fig.4  3-D reconstruction of a data set obtained by APT analysis on a M23C6 carbide distributed at prior austenite grain boundaries[8]
Fig.5  Schematic of M23(CB)6 formation process during heat treatment[10](a) nomalizing temperature 1100 ℃(b) tempering temperature 800 ℃ (G.B.—grainboundary)
Fig.6  Schematic mechanism of B restraining the Ostwald ripening of M23C6 carbides[9]
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