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首页> 外文期刊>ISIJ international >Microstructural Characteristics with Various Finish Rolling Temperature and Low Temperature Toughness in Hot Rolled Nb-Ti Ferritic Steel
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Microstructural Characteristics with Various Finish Rolling Temperature and Low Temperature Toughness in Hot Rolled Nb-Ti Ferritic Steel

机译：热轧Nb-Ti铁素体钢在不同终轧温度和低温韧性下的组织性能

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摘要

In order to investigate the effects of finish rolling temperature on the microstructural characteristics and fracture mechanism of Nb-Ti ferritic steel, the samples with various finish rolling temperature have been observed by optical microscopy, scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy. The results indicated that both ferrite grain size and volume fraction of (Nb,Ti)C precipitates decreased with the decreasing finish rolling temperature, but the size of (Nb,Ti)C precipitates changed little with the finish rolling temperature. All of these factors caused the yield strength, tensile strength and elongation remained similar. However, the low temperature toughness was significantly influenced by the finish rolling temperature. Based on the observation results of fracture surface of samples tested at -40℃, the fracture type of steels with finish rolling temperature of 940℃ and 910℃ was brittle, while the fracture of steel with finish rolling temperature of 880℃ was ductile. At last, the crack initiation and propagation mechanism is elucidated in details. At -40℃, both intergranular cracks and transgranular cracks existed in the steels finish rolled at 940℃ and 910℃, and only microvoides were observed in the steel finish rolled at 880℃ with high toughness.
机译：为了研究终轧温度对Nb-Ti铁素体钢组织和断裂机理的影响，通过光学显微镜，扫描电子显微镜，电子背散射衍射和透射电子显微镜观察了不同终轧温度的样品。结果表明，随着终轧温度的降低，铁素体晶粒尺寸和（Nb，Ti）C析出物的体积分数均降低，但随着终轧温度的降低，（Nb，Ti）C析出物的尺寸变化不大。所有这些因素引起的屈服强度，拉伸强度和伸长率保持相似。但是，低温韧性受精轧温度的影响很大。根据在-40℃下测试的试样的断面观察结果，精轧温度为940℃和910℃的钢的脆性为脆性，而精轧温度为880℃的钢的断口为延性的。最后，详细阐述了裂纹的萌生和扩展机理。在-40℃下，在940℃和910℃下轧制的钢中均存在晶间裂纹和晶间裂纹，在880℃下轧制的高韧性钢中仅观察到微孔。

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  • 来源
    《ISIJ international》 |2016年第4期|602-609|共8页
  • 作者

    Fengqin JI; Chengning LI; Shuai TANG; Guo YUAN; Guodong WANG;

  • 作者单位

    The State Key Laboratory of Rolling and Automation, Northeastern University, P.O. Box. 105, No. 11, Lane 3, Wenhua Road, Heping District, Shenyang, 110819 China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, P.O. Box. 105, No. 11, Lane 3, Wenhua Road, Heping District, Shenyang, 110819 China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, P.O. Box. 105, No. 11, Lane 3, Wenhua Road, Heping District, Shenyang, 110819 China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, P.O. Box. 105, No. 11, Lane 3, Wenhua Road, Heping District, Shenyang, 110819 China;

    The State Key Laboratory of Rolling and Automation, Northeastern University, P.O. Box. 105, No. 11, Lane 3, Wenhua Road, Heping District, Shenyang, 110819 China;

  • 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

    microstructural characteristics; finish rolling temperature; fracture mechanism; Nb-Ti steel;

    机译：微观结构特征终轧温度断裂机理铌钛钢;

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