Evolution of boron segregation during tempering in B doped 9%Cr ferritic steel

Takumi Osanai; Nobuaki Sekido; Mitsuharu Yonemura; Kouichi Maruyama; Miyuki Takeuchi; Kyosuke Yoshimi

doi:10.1016/j.matchar.2021.111192

Evolution of boron segregation during tempering in B doped 9%Cr ferritic steel

Takumi Osanai, Nobuaki Sekido, Mitsuharu Yonemura, Kouichi Maruyama, Miyuki Takeuchi, Kyosuke Yoshimi

ENG - Materials Science

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Boron segregation behavior during tempering at 600 and 790 °C was examined in a boron-doped 9Cr-steel by using high-resolution SIMS imaging (nano-SIMS). Boron segregation that developed at prior austenite grain boundaries (PAGBs) during austenitizing was found to decrease reduced during tempering because the equilibrium concentration of B segregation for austenite is larger than that for ferrite so that the segregated boron atoms diffused into block and packet boundaries. The size and the volume fraction of the carbide precipitates at PAGBs were smaller than those at packet boundaries, suggesting that boron segregation at PAGBs suppresses the carbide precipitation upon tempering.

Original language	English
Article number	111192
Journal	Materials Characterization
Volume	177
DOIs	https://doi.org/10.1016/j.matchar.2021.111192
Publication status	Published - 2021 Jul

Keywords

Boron
Ferritic steel
Grain boundary segregation
Nano-SIMS
Tempering

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10.1016/j.matchar.2021.111192

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title = "Evolution of boron segregation during tempering in B doped 9%Cr ferritic steel",

abstract = "Boron segregation behavior during tempering at 600 and 790 °C was examined in a boron-doped 9Cr-steel by using high-resolution SIMS imaging (nano-SIMS). Boron segregation that developed at prior austenite grain boundaries (PAGBs) during austenitizing was found to decrease reduced during tempering because the equilibrium concentration of B segregation for austenite is larger than that for ferrite so that the segregated boron atoms diffused into block and packet boundaries. The size and the volume fraction of the carbide precipitates at PAGBs were smaller than those at packet boundaries, suggesting that boron segregation at PAGBs suppresses the carbide precipitation upon tempering.",

keywords = "Boron, Ferritic steel, Grain boundary segregation, Nano-SIMS, Tempering",

author = "Takumi Osanai and Nobuaki Sekido and Mitsuharu Yonemura and Kouichi Maruyama and Miyuki Takeuchi and Kyosuke Yoshimi",

note = "Funding Information: This work was supported by the ISIJ Research Promotion Grant ( 2018 ), JSPS KAKENHI Grant Number JP18K18930 , and the University of Tokyo Advanced Characterization Nanotechnology Platform, as a program of “Nanotechnology Platform” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan under the Grant Number JPMXP09A19UT0286 . Publisher Copyright: {\textcopyright} 2021 Elsevier Inc.",

year = "2021",

month = jul,

doi = "10.1016/j.matchar.2021.111192",

language = "English",

volume = "177",

journal = "Materials Characterization",

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T1 - Evolution of boron segregation during tempering in B doped 9%Cr ferritic steel

AU - Osanai, Takumi

AU - Sekido, Nobuaki

AU - Yonemura, Mitsuharu

AU - Maruyama, Kouichi

AU - Takeuchi, Miyuki

AU - Yoshimi, Kyosuke

N1 - Funding Information: This work was supported by the ISIJ Research Promotion Grant ( 2018 ), JSPS KAKENHI Grant Number JP18K18930 , and the University of Tokyo Advanced Characterization Nanotechnology Platform, as a program of “Nanotechnology Platform” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan under the Grant Number JPMXP09A19UT0286 . Publisher Copyright: © 2021 Elsevier Inc.

PY - 2021/7

Y1 - 2021/7

N2 - Boron segregation behavior during tempering at 600 and 790 °C was examined in a boron-doped 9Cr-steel by using high-resolution SIMS imaging (nano-SIMS). Boron segregation that developed at prior austenite grain boundaries (PAGBs) during austenitizing was found to decrease reduced during tempering because the equilibrium concentration of B segregation for austenite is larger than that for ferrite so that the segregated boron atoms diffused into block and packet boundaries. The size and the volume fraction of the carbide precipitates at PAGBs were smaller than those at packet boundaries, suggesting that boron segregation at PAGBs suppresses the carbide precipitation upon tempering.

AB - Boron segregation behavior during tempering at 600 and 790 °C was examined in a boron-doped 9Cr-steel by using high-resolution SIMS imaging (nano-SIMS). Boron segregation that developed at prior austenite grain boundaries (PAGBs) during austenitizing was found to decrease reduced during tempering because the equilibrium concentration of B segregation for austenite is larger than that for ferrite so that the segregated boron atoms diffused into block and packet boundaries. The size and the volume fraction of the carbide precipitates at PAGBs were smaller than those at packet boundaries, suggesting that boron segregation at PAGBs suppresses the carbide precipitation upon tempering.

KW - Boron

KW - Ferritic steel

KW - Grain boundary segregation

KW - Nano-SIMS

KW - Tempering

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SN - 1044-5803

VL - 177

JO - Materials Characterization

JF - Materials Characterization

M1 - 111192

ER -

Evolution of boron segregation during tempering in B doped 9%Cr ferritic steel

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Keywords

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