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Two types of boron segregation at austenite grain boundaries and their mutual relation

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Abstract

The distribution of boron in 10 p.p.m. B-doped Fe-30 wt% Ni austenitic alloy was investigated by means of particle tracking autoradiography (PTA). It was shown that when quenched from a certain temperature between 750° C and 1220° C with medium cooling rates, both equilibrium and non-equilibrium grain boundary segregation of boron appeared in the alloy. The degree of segregation represented the sum of the two kinds of segregation of boron. A transition temperature, of approximately 950° C, was found below which the equilibrium grain-boundary segregation was dominant and above which the non-equilibrium grainboundary segregation was dominant. For the degree of segregation achieved by these two types of segregation of boron there exists a temperature from 1000° C to 1050° C at which a minimum amount of segregation is obtained. It was also shown that non-equilibrium segregation of boron can considerably promote the precipitation of boride at grain boundaries.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Wuhan Iron and Steel University, 430081, Wuhan, Hubei, China

    Xu Tingdong, Song Shenhua & Yuan Zhexi

  2. Department of Materials Physics, University of Science and Technology, Beijing, People's Republic of China

    Yu Zongsen

Authors
  1. Xu Tingdong
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  2. Song Shenhua
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  3. Yuan Zhexi
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  4. Yu Zongsen
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Tingdong, X., Shenhua, S., Zhexi, Y. et al. Two types of boron segregation at austenite grain boundaries and their mutual relation. J Mater Sci 25, 1739–1744 (1990). https://doi.org/10.1007/BF01045378

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  • DOI: https://doi.org/10.1007/BF01045378

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