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Strengthening mechanism and thermal stability of severely deformed ferritic/martensitic steel

机译：严重变形的铁素体/马氏体钢的强化机理和热稳定性

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摘要

The strengthening mechanism of the ultrafine-grained ferritic/martensitic steel (T91) prepared by equal-channel angular pressing (ECAP) is studied by microhardness measurement, transmission electron microscopy and internal friction. The results show that dislocation strengthening rather than grain boundary strengthening plays a dominant role in the increase in microhardness. Upon annealing at different temperatures, it is found that there is an evident decrease in microhardness between 650 and 700 ℃ for the ECAPed specimens processed by 1 pass and 4 passes. An internal friction peak is also observed in the vicinity of 670 ℃ for the ECAPed specimens during the first heating but disappears during the second heating. The TEM observations indicate that there is no evident change in the grain size for the ECAPed specimens before and after the annealing at 700 ℃ for 1 h. It is concluded that the softening around 670 ℃ stems mainly from the dislocation annihilation.
机译：通过显微硬度测量，透射电子显微镜和内摩擦研究了等通道角向压制（ECAP）制备的超细铁素体/马氏体钢（T91）的强化机理。结果表明，位错强化而不是晶界强化在显微硬度的增加中起主要作用。在不同温度下进行退火后，发现经过1道和4道处理的ECAPed试样在650至700℃之间的显微硬度明显降低。在第一次加热期间，ECAPed试样在670℃附近还观察到内部摩擦峰，但在第二次加热期间消失。 TEM观察表明，在700℃退火1 h之前和之后，ECAPed试样的晶粒尺寸没有明显变化。结论是670℃附近的软化主要是由位错an没引起的。

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  • 来源
    《Materials Science and Engineering》 |2014年第24期|244-249|共6页
  • 作者

    T. Hao; Z.Q. Fan; S.X. Zhao; G.N. Luo; C.S. Liu; QF. Fang;

  • 作者单位

    Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031, China;

    Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031, China;

    Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP), P.O. Box 1126, Hefei 230031, China;

    Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP), P.O. Box 1126, Hefei 230031, China;

    Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031, China;

    Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031, China;

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  • 正文语种 eng
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  • 关键词

    Ferritic/martensitic steel; Severe plastic deformation; Equal-channel angular pressing; Internal friction;

    机译：铁素体/马氏体钢;严重的塑性变形;等通道角压;内摩擦;

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