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

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9 Citations (Scopus)


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 languageEnglish
Article number111192
JournalMaterials Characterization
Publication statusPublished - 2021 Jul


  • Boron
  • Ferritic steel
  • Grain boundary segregation
  • Nano-SIMS
  • Tempering


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