Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Heat Treatment on the Micro-structures and the Mechanical Properties of 0.002% Boron-added Low Carbon Steel

0.002% 보론첨가 저탄소강의 미세조직 및 기계적 성질에 미치는 열처리의 영향

  • 임종호 ((재)포항금속소재산업진흥원) ;
  • 김종식 ((재)포항금속소재산업진흥원) ;
  • 박병호 ((재)포항금속소재산업진흥원) ;
  • 이진현 ((재)포항금속소재산업진흥원) ;
  • 최정묵 ((주)진합)
  • Received : 2011.04.21
  • Accepted : 2011.05.09
  • Published : 2011.06.27
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Abstract

The effect of heat treatment on the micro-structures and the mechanical properties of 0.002% boron added low carbon steel was investigated. The tensile strength reached the peak at about $880-890^{\circ}C$ with the rising quenching temperature and then the hardness decreased sharply, but the tensile strength hardly decreased. The tensile and yield strength decreased and the total elongation increased with a rising tempering temperature, but the tensile and yield strength sharply fell and the total elongation prominently increased from above a $400-450^{\circ}C$ tempering temperature. Tempered martensite embrittlement (TME) was observed at tempering condition of $350-400^{\circ}C$. In the condition of quenching at $890^{\circ}C$ and tempering at $350^{\circ}C$, the boron precipitates were observed as Fe-C-B and BN together. The hardness decreased in proportion to the tempering temperature untill $350^{\circ}C$ and dropped sharply above $400^{\circ}C$ regardless of the quenching temperature.

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References

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