Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Microstructures on Cleavage Fracture Strength in Bainitic and Martensitic Steels

베이나이트 - 마르텐사이트 복합조직강에서 미세조직이 벽개파괴강도에 미치는 영향

  • 이창훈 (한국기계연구원 부설 재료연구소)
  • Received : 2014.03.13
  • Accepted : 2014.03.31
  • Published : 2014.05.30
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Abstract

Cleavage fracture behaviors were investigated in Ni-Mo-Cr steels with mixed microstructure of lower bainite and martensite. As the size of carbide decreased, the cleavage fracture strength increased, which was independent of the sizes of grain and packet. The measured cleavage fracture strengths were in good agreement with cleavage fracture strengths calculated by Petch model rather than by modified Griffith model in micro-structures with fine carbides, the size of which were small below a few hundred nanometer.

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References

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