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首页> 外文期刊>Fusion Engineering and Design >Microstructural evolution of high Cr ferrite/martensite steel after deformation in metastable austenite zone
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Microstructural evolution of high Cr ferrite/martensite steel after deformation in metastable austenite zone

机译：亚稳奥氏体区变形后高Cr铁素体/马氏体钢的组织演变

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摘要

Highlights•Deformation aboveMsresults in refinement and inhomogeneity of martensitic lath.•Deformation aboveMscauses increase ofMs, and extension of martensitic transformation time.•Decrease of deformation temperature leads to increase of recovery fraction.AbstractIn this paper, the influence of compressive deformation in metastable austenite zone (at 700, 600 and 500°C, respectively) on microstructural characteristics and martensitic transformation behavior for the high Cr ferrite/martensite steel is investigated by using high-resolution dilatometry and transmission electron microscopy (TEM) observation. The results show that compressive deformation in metastable austenite zone results in decrease of martensite lath width and increase of martensite starting temperature (Ms) due to increase of defection density for martensitic nucleation. The martensitic transformation time is extended by the pre-stress loading aboveMs, which is ascribed to decrease of interfacial migration rate during martensitic transformation by means of strain hardening. The results of tempering experiments indicate that decrease of deformation temperature leads to increase of recovery fraction. This is ascribed to that decrease of deformation temperature raises the residual strain energy and thus lowers the apparent activation energy for recovery. Hence, phenomenon of recovery occurs prematurely in the tempering specimen with the low deformation temperature.
机译： 突出显示 • M s 以上的变形会导致优化和马氏体板条的不均匀性。 • M s 以上的变形会导致 M < ce：inf loc =“ post”> s ，并延长了马氏体转变时间。 • 变形温度降低会导致温度升高恢复分数。 摘要 本文研究了亚稳奥氏体区（分别在700、600和500°C时）的压缩变形对高Cr铁素体/马氏体钢的显微组织特征和马氏体转变行为的影响通过使用高分辨率膨胀计和透射电子显微镜（TEM）观察进行了研究。结果表明，亚稳奥氏体区的压缩变形会导致马氏体板条宽度减小和马氏体起始温度升高（ M s ），因为马氏体形核的缺陷密度增加。马氏体转变时间因预应力载荷超过 M s 而延长，这归因于界面的减少马氏体转变过程中通过应变硬化的迁移速率。回火实验的结果表明，变形温度的降低导致采收率的增加。这归因于变形温度的降低提高了残余应变能，从而降低了用于恢复的表观活化能。因此，在变形温度低的回火试样中会过早出现恢复现象。

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  • 来源
    《Fusion Engineering and Design》 |2017年第12期|367-371|共5页
  • 作者

    Chenxi Liu; Qiuhong Zhao; Yongchang Liu; Chen Wei; Huijun Li;

  • 作者单位

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University;

    Tianjin Special Equipment Inspection Institute;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University;

    Tianjin Special Equipment Inspection Institute;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University;

  • 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

    High Cr ferrite/martensite steel; Deformation; Microstructure;

    机译：高铬铁素体/马氏体钢变形显微组织;

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