Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Atom Probe Tomography and Nano Secondary Ion Mass Spectroscopy Investigation of the Segregation of Boron at Austenite Grain Boundaries in 0.5 wt.% Carbon Steels

  • Seol, J.B. (Department of Materials Scence & Engineering, Pohang University Scence & Engineering (POSTECH)) ;
  • Lim, N.S. (Department of Materials Scence & Engineering, Pohang University Scence & Engineering (POSTECH)) ;
  • Lee, B.H. (National Center for Nanomaterials Technology (NCNT)) ;
  • Renaud, L. (CAMECA 29 Quai des Gresillons) ;
  • Park, C.G. (Department of Materials Scence & Engineering, Pohang University Scence & Engineering (POSTECH))
  • Published : 2011.06.20
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Abstract

The grain boundary segregation of boron atoms in high strength low alloy steels containing 50 ppm boron was accomplished using atom probe tomography (APT) and nano-beam secondary ion mass spectroscopy (SIMS). The formation of boro-carbides under an excessive addition of boron to the steels was identified through the SIMS and TEM. The APT was performed in order to evaluate the composition of the alloying elements, such as, boron and carbon, segregated at prior austenite grain boundaries. The boron contents at the prior austenite grain boundaries were approximately $1.7{\pm}0.2$ at.%, which was approximately 70 times more than the amount of boron added to the steels.

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