Effect of Substructure on Toughness of Lath Martensite/Bainite Mixed Structure in Low-Carbon Steels

LUO Zhi-jun;SHEN Jun-chang;SU Hang;et al

钢铁研究学报(英文版) ›› 2010, Vol. 17 ›› Issue (11) : 40-48.

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钢铁研究学报(英文版) ›› 2010, Vol. 17 ›› Issue (11) : 40-48.
材料

Effect of Substructure on Toughness of Lath Martensite/Bainite Mixed Structure in Low-Carbon Steels

  • LUO Zhi-jun, SHEN Jun-chang, SU Hang, et al
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Effect of Substructure on Toughness of Lath Martensite/Bainite Mixed Structure in Low-Carbon Steels

  • LUO Zhi-jun, SHEN Jun-chang, SU Hang, et al
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摘要

Substructure of M/B mixed structure in a low carbon NiCrMoV steel obtained through different cooling mode were quantitative analysis by optical microscope, SEM, EBSD and TEM to investigate the effect of the substructure on toughness. The results indicated that with the same prior austenite grain size and mixed by different ratio of M and B, toughness of steel enhanced with decrease of packet and block size and the lath width was about 0.38um. Calculation showed that packet and block boundary have the same effect on delaying crack extension, furthermore, effect of block width on impact energy was notably bigger than packet one. Therefore, block could work as a contributing microstructure controlled substructure in low carbon martensite steels, which means that block size was “the effect grain size controlling toughness”.

Abstract

Substructure of M/B mixed structure in a low carbon NiCrMoV steel obtained through different cooling mode were quantitative analysis by optical microscope, SEM, EBSD and TEM to investigate the effect of the substructure on toughness. The results indicated that with the same prior austenite grain size and mixed by different ratio of M and B, toughness of steel enhanced with decrease of packet and block size and the lath width was about 0.38um. Calculation showed that packet and block boundary have the same effect on delaying crack extension, furthermore, effect of block width on impact energy was notably bigger than packet one. Therefore, block could work as a contributing microstructure controlled substructure in low carbon martensite steels, which means that block size was “the effect grain size controlling toughness”.

关键词

toughness / EBSD / crack extension / lath martensite/bainite mixed structure

Key words

toughness / EBSD / crack extension / lath martensite/bainite mixed structure

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SHEN Jun-chang, SU Hang, et al, . Effect of Substructure on Toughness of Lath Martensite/Bainite Mixed Structure in Low-Carbon Steels[J]. 钢铁研究学报(英文版), 2010, 17(11): 40-48
SHEN Jun-chang, SU Hang, et al, et al. Effect of Substructure on Toughness of Lath Martensite/Bainite Mixed Structure in Low-Carbon Steels[J]. Journal of Iron and Steel Research International, 2010, 17(11): 40-48

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