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首页> 外文期刊>ISIJ international >Effect of Pearlite Volume Fraction on Two-step Ductile to Brittle Transition in Ferrite + Pearlite Structure Steel Sheets
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Effect of Pearlite Volume Fraction on Two-step Ductile to Brittle Transition in Ferrite + Pearlite Structure Steel Sheets

机译：珠光体体积分数对铁素体+珠光体结构钢板两步延性至脆性转变的影响

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摘要

Multi structural steels exhibit high strength and good formability; however, their performance depends on the volume fraction of the secondary phase. In our previous study, ferrite + pearlite structural steel sheet showed the characteristic two-step ductile-to-brittle transition (DBT) with decreasing temperature, and the absorbed energy curve exhibited a distinct middle shelf. In this study, we evaluated the effect of pearlite volume fraction (V_P) on the DBT behavior by the Charpy impact test with sub-size specimens. For specimens without pearlite, the absorbed energy directly dropped from the upper shelf to the lower shelf with decreasing temperature. For samples with 2-3% pearlite, the absorbed energy corresponding to the transition temperature range was dispersed between the two shelves, and the transition behavior seemed to be the typical DBT behavior. When V_P was increased to 21%, the absorbed energy just above the transition-finish temperature became stable at a middle level between the two shelves; thus, the existence of a distinct middle shelf was confirmed. Although the transition-start temperature increased with increasing V_P, V_P did not affect the transition-finish temperature and the absorbed energy at the middle shelf. These results were analyzed with a simple model based on the Yoffee diagram.
机译：多种结构钢表现出高强度和良好的可成型性。但是，它们的性能取决于次级相的体积分数。在我们先前的研究中，铁素体+珠光体结构钢板显示出随着温度降低而发生的特征性的两步延性-脆性转变（DBT），并且吸收能曲线表现出明显的中间层架。在这项研究中，我们通过用小尺寸试样进行的夏比冲击试验评估了珠光体体积分数（V_P）对DBT行为的影响。对于没有珠光体的样品，随着温度降低，吸收的能量直接从上层架子降到下层架子。对于具有2-3％珠光体的样品，对应于转变温度范围的吸收能量分散在两个架子之间，转变行为似乎是典型的DBT行为。当V_P增加到21％时，刚好在过渡结束温度以上的吸收能量在两个架子之间的中间水平变得稳定；因此，证实存在明显的中间架子。尽管过渡开始温度随V_P的增加而增加，但V_P不会影响过渡结束温度和中间架子的吸收能量。使用基于Yoffee图的简单模型分析了这些结果。

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  • 来源
    《ISIJ international》 |2019年第7期|1344-1353|共10页
  • 作者

    Hiroyuki KAWATA; Osamu UMEZAWA;

  • 作者单位

    Steel Research Laboratories, Nippon Steel & Sumitomo Metal Corporation, 20-1 Shintomi, Futtsu, Chiba, 293-8511 Japan;

    Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa, 240-8501 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ductile to brittle transition; dual phase steel sheet; Charpy impact test; middle shelf;

    机译：韧性到脆性转变;双相钢板夏比冲击试验;中间架子;

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