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Ultrafine grain effect on pearlitic transformation in hypereutectoid steel

机译：超细晶粒对超共析钢珠光体转变的影响

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摘要

Pearlitic transformation in an ultrafine-grained (UFG) hypereutectoid steel was investigated. The steel was a plain carbon steel containing 1.0 wt% C and very few other elements. The UFG samples were prepared by thermomechanical treatment, and an average grain size of approximately 1 |im was achieved. The pearlitic transformation was conducted by heating the UFG samples at 1023 K for different times and then cooling in air. A new pearlitic transformation phenomenon was observed: traditional lamellar pearlite can be observed only when the grain size increases to a dimension larger than approximately 4 μm, which is a critical value. When grain size is smaller than this value, the pearlitic transformation occurs in the form of divorced eutectoid, and the microstructure is the ferrite matrix with granular cementite. This research indicates that grain size has a great influence on pearlitic transformation by shortening the diffusion distance and increasing the diffusion rate of carbon atoms in the UFG steel.
机译：研究了超细晶粒（UFG）超共析钢中的珠光体转变。该钢是含有1.0 wt％C和很少其他元素的普通碳素钢。 UFG样品是通过热机械处理制备的，平均晶粒尺寸约为1μm。通过在1023 K下加热UFG样品不同的时间，然后在空气中冷却，进行珠光体转变。观察到一种新的珠光体相变现象：仅当晶粒尺寸增加到大于约4μm的尺寸（临界值）时，才能观察到传统的层状珠光体。当晶粒尺寸小于该值时，珠光体转变以离析的共析形式出现，并且显微组织是具有颗粒渗碳体的铁素体基体。这项研究表明，晶粒尺寸通过缩短UFG钢中的扩散距离和增加碳原子的扩散速率，对珠光体相变有很大的影响。

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  • 来源
    《Journal of Materials Research》 |2013年第5期|757-765|共9页
  • 作者

    Fu Liang Lian; Hong Ji Liu; Jun Jie Sun; Xue Jiao Sun; Sheng Wu Guo; Yong Ning Liu; Lin Xiu Du;

  • 作者单位

    School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi'an Jiaotong University,XV an 710049, People's Republic of China;

    School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi'an Jiaotong University,XV an 710049, People's Republic of China;

    School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi'an Jiaotong University,XV an 710049, People's Republic of China;

    School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi'an Jiaotong University,XV an 710049, People's Republic of China;

    School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi'an Jiaotong University,XV an 710049, People's Republic of China;

    School of Materials Science, State Key Laboratory of Mechanical Behavior of Materials, Xi'an Jiaotong University,XV an 710049, People's Republic of China;

    State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang 110819,People's Republic of 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);
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  • 正文语种 eng
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