Radiation induced grain boundary segregation in ferritic/martensitic steels

L. D. Xia; Y. Z. Ji; W. B. Liu; H. Chen; Z. G. Yang; C. Zhang; L. Q. Chen

doi:10.1016/j.net.2019.07.009

Radiation induced grain boundary segregation in ferritic/martensitic steels

L. D. Xia, Y. Z. Ji, W. B. Liu, H. Chen, Z. G. Yang, C. Zhang, L. Q. Chen

Materials Science and Engineering

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

16 Scopus citations

Abstract

The radiation induced segregation of Cr at grain boundaries (GBs) in Ferritic/Martensitic steels was modeled assuming vacancy and interstitialcy diffusion mechanisms. In particular, the dependence of segregation on temperature and grain boundary misorientation angle was analyzed. It is found that Cr enriches at grain boundaries at low temperatures primarily through the interstitialcy mechanism while depletes at high temperatures predominantly through the vacancy mechanism. There is a crossover from Cr enrichment to depletion at an intermediate temperature where the Cr:Fe vacancy and interstitialcy diffusion coefficient ratios intersect. The bell-shape Cr enrichment response is attributed to the decreasing void sinks inside the grains as temperature rises. It is also shown that low angle grain boundaries (LAGBs) and special Σ coincidence-site lattice (CSL) grain boundaries exhibit suppressed radiation induced segregation (RIS) response while high angle grain boundaries (HAGBs) have high RIS segregation. This different behavior is attributed to the variations in dislocation density at different grain boundaries.

Original language	English (US)
Pages (from-to)	148-154
Number of pages	7
Journal	Nuclear Engineering and Technology
Volume	52
Issue number	1
DOIs	https://doi.org/10.1016/j.net.2019.07.009
State	Published - Jan 2020

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Nuclear Energy and Engineering

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10.1016/j.net.2019.07.009

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title = "Radiation induced grain boundary segregation in ferritic/martensitic steels",

abstract = "The radiation induced segregation of Cr at grain boundaries (GBs) in Ferritic/Martensitic steels was modeled assuming vacancy and interstitialcy diffusion mechanisms. In particular, the dependence of segregation on temperature and grain boundary misorientation angle was analyzed. It is found that Cr enriches at grain boundaries at low temperatures primarily through the interstitialcy mechanism while depletes at high temperatures predominantly through the vacancy mechanism. There is a crossover from Cr enrichment to depletion at an intermediate temperature where the Cr:Fe vacancy and interstitialcy diffusion coefficient ratios intersect. The bell-shape Cr enrichment response is attributed to the decreasing void sinks inside the grains as temperature rises. It is also shown that low angle grain boundaries (LAGBs) and special Σ coincidence-site lattice (CSL) grain boundaries exhibit suppressed radiation induced segregation (RIS) response while high angle grain boundaries (HAGBs) have high RIS segregation. This different behavior is attributed to the variations in dislocation density at different grain boundaries.",

author = "Xia, {L. D.} and Ji, {Y. Z.} and Liu, {W. B.} and H. Chen and Yang, {Z. G.} and C. Zhang and Chen, {L. Q.}",

note = "Funding Information: The authors acknowledge the financial support from The National Natural Science Foundation of China (Grant 51771097 , Grant 11705173 ), The National Magnetic Confinement Fusion Energy Research Project of China (Grant 2015GB118001 ), The National Key Research and Development Plan (Grant 2017YFB0305201 ), The Science Challenge Project (Grant TZ2018004 ), The National Basic Research Programs of China (Grant 2015CB654802 ). Publisher Copyright: {\textcopyright} 2019",

year = "2020",

month = jan,

doi = "10.1016/j.net.2019.07.009",

language = "English (US)",

volume = "52",

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journal = "Nuclear Engineering and Technology",

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T1 - Radiation induced grain boundary segregation in ferritic/martensitic steels

AU - Xia, L. D.

AU - Ji, Y. Z.

AU - Liu, W. B.

AU - Chen, H.

AU - Yang, Z. G.

AU - Zhang, C.

AU - Chen, L. Q.

N1 - Funding Information: The authors acknowledge the financial support from The National Natural Science Foundation of China (Grant 51771097 , Grant 11705173 ), The National Magnetic Confinement Fusion Energy Research Project of China (Grant 2015GB118001 ), The National Key Research and Development Plan (Grant 2017YFB0305201 ), The Science Challenge Project (Grant TZ2018004 ), The National Basic Research Programs of China (Grant 2015CB654802 ). Publisher Copyright: © 2019

PY - 2020/1

Y1 - 2020/1

N2 - The radiation induced segregation of Cr at grain boundaries (GBs) in Ferritic/Martensitic steels was modeled assuming vacancy and interstitialcy diffusion mechanisms. In particular, the dependence of segregation on temperature and grain boundary misorientation angle was analyzed. It is found that Cr enriches at grain boundaries at low temperatures primarily through the interstitialcy mechanism while depletes at high temperatures predominantly through the vacancy mechanism. There is a crossover from Cr enrichment to depletion at an intermediate temperature where the Cr:Fe vacancy and interstitialcy diffusion coefficient ratios intersect. The bell-shape Cr enrichment response is attributed to the decreasing void sinks inside the grains as temperature rises. It is also shown that low angle grain boundaries (LAGBs) and special Σ coincidence-site lattice (CSL) grain boundaries exhibit suppressed radiation induced segregation (RIS) response while high angle grain boundaries (HAGBs) have high RIS segregation. This different behavior is attributed to the variations in dislocation density at different grain boundaries.

AB - The radiation induced segregation of Cr at grain boundaries (GBs) in Ferritic/Martensitic steels was modeled assuming vacancy and interstitialcy diffusion mechanisms. In particular, the dependence of segregation on temperature and grain boundary misorientation angle was analyzed. It is found that Cr enriches at grain boundaries at low temperatures primarily through the interstitialcy mechanism while depletes at high temperatures predominantly through the vacancy mechanism. There is a crossover from Cr enrichment to depletion at an intermediate temperature where the Cr:Fe vacancy and interstitialcy diffusion coefficient ratios intersect. The bell-shape Cr enrichment response is attributed to the decreasing void sinks inside the grains as temperature rises. It is also shown that low angle grain boundaries (LAGBs) and special Σ coincidence-site lattice (CSL) grain boundaries exhibit suppressed radiation induced segregation (RIS) response while high angle grain boundaries (HAGBs) have high RIS segregation. This different behavior is attributed to the variations in dislocation density at different grain boundaries.

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Radiation induced grain boundary segregation in ferritic/martensitic steels

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