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首页> 外文期刊>Journal of Materials Research >The influence of fine ferrite formation on the γ/α interface, fine bainite and retained austenite in a thermomechanically-processed transformation induced plasticity steel
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The influence of fine ferrite formation on the γ/α interface, fine bainite and retained austenite in a thermomechanically-processed transformation induced plasticity steel

机译：热变形相变诱发塑性钢中细铁素体的形成对γ/α界面，细贝氏体和残余奥氏体的影响

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摘要

An Fe-0.26C-1.96Si-2Mn with 0.31Mo (wt%) steel was subjected to a novel thermomechanical processing route to produce fine ferrite with different volume fractions, bainite, and retained austenite. Two types of fine ferrites were found to be: (ⅰ) formed along prior austenite grain boundaries, and (ⅱ) formed intragranularly in the interior of austenite grains. An increase in the volume fraction of fine ferrite led to the preferential formation of blocky retained austenite with low stability, and to a decrease in the volume fraction of bainite with stable layers of retained austenite. The difference in the morphology of the bainitic ferrite and the retained austenite after different isothermal ferrite times was found to be responsible for the deterioration of the mechanical properties. The segregation of Mn, Mo, and C at distances of 2-2.5 nm from the ferrite and retained austenite/martensite interface on the retained austenite/martensite site was observed after 2700 s of isothermal hold. It was suggested that the segregation occurred during the austenite-to-ferrite transformation, and that this would decrease the interface mobility, which affects the austenite-to-ferrite transformation and ferrite grain size.
机译：对具有0.31Mo（wt％）钢的Fe-0.26C-1.96Si-2Mn进行新颖的热机械加工，以生产具有不同体积分数的细铁素体，贝氏体和残余奥氏体。发现两种类型的细铁素体：（ⅰ）沿先前的奥氏体晶界形成，和（ⅱ）在奥氏体晶粒内部的晶内形成。细铁素体的体积分数的增加导致优先形成具有低稳定性的块状残余奥氏体，并且导致具有稳定奥氏体层的贝氏体的体积分数降低。发现在等温铁素体时间不同之后，贝氏体铁素体和残余奥氏体的形貌差异是导致机械性能下降的原因。等温保持2700 s后，观察到Mn，Mo和C在距铁素体2-2.5 nm处和残留奥氏体/马氏体界面上的偏析。建议在奥氏体-铁素体相变过程中发生偏析，这会降低界面迁移率，从而影响奥氏体-铁素体相变和铁素体晶粒尺寸。

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  • 来源
    《Journal of Materials Research》 |2016年第6期|806-818|共13页
  • 作者

    Iiana B. Timokhina; Michael K. Miller; Hossein Beladi; Peter D. Hodgson;

  • 作者单位

    Institute for Frontier Materials, Deakin University, Geelong, Victoria 3217, Australia;

    Oak Ridge National Laboratory, Center for Nanophase Materials Sciences, Oak Ridge, Tennessee 37831-6139, USA;

    Institute for Frontier Materials, Deakin University, Geelong, Victoria 3217, Australia;

    Institute for Frontier Materials, Deakin University, Geelong, Victoria 3217, Australia;

  • 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
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