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Microstructure and mechanical properties of high-Mn-ODS steels

机译：高MN-ODS钢的微观结构和力学性能

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摘要

The contribution of dislocation density to strength of Cr-Ni containing austenitic ODS steels is assumed to be limited by dynamic recovery during consolidation of mechanically alloyed powder [Seils et al. Materials Science and Engineering A 786 (2020) 139452]. In order to prevent the reduction in dislocation density by dislocation annihilation subsequent to thermally activated cross slip during recovery, Cr and Ni were replaced by 24 and 34 wt% of Mn in the present study. The comparably lower stacking fault energy leads to larger stacking fault widths and, hence, lower probability of cross slip. The Mn-ODS steels were successfully manufactured by mechanical alloying and subsequent field assisted sintering. X-ray diffraction analysis revealed increased dislocation densities for both Mn-ODS alloys compared to a previously reported Cr-Ni-ODS steel. Formation of additional E-phase was observed in the lower Mn alloy. Compression and hardness tests confirmed an improved strength and hardness of the Mn-ODS steels. Less thermal stability was found compared to the Cr-Ni-ODS steels due to pronounced ripening of oxide particles as well as grain coarsening in both investigated alloys.
机译：假设在机械合金粉末固结期间，假设脱位密度对Cr-Ni含Cr-Ni强度的强度的贡献受到动态恢复的限制[Seils等人。材料科学与工程A 786（2020）139452]。为了防止在恢复过程中在热活化的交叉滑移后通过脱位湮灭的脱位密度降低，在本研究中，Cr和Ni被24和34wt％的Mn取代。相对较低的堆叠故障能量导致较大的堆叠故障宽度，因此，较低的交叉滑移概率。通过机械合金化和随后的现场辅助烧结成功制造MN-ODS钢。与先前报道的CR-Ni-ODS钢相比，X射线衍射分析显示了MN-ODS合金的增加的脱位密度。在下部Mn合金中观察到额外的E相的形成。压缩和硬度测试证实了Mn-ODS钢的改善的强度和硬度。与氧化物颗粒的明显成熟以及两种研究合金中的粗粗化相比，发现与Cr-Ni-ODS钢相比，发现较少的热稳定性。

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  • 来源
    《Materials Science and Engineering》 |2021年第21期|141859.1-141859.10|共10页
  • 作者

    S. Seils; A. Kauffmann; W. Delis; T. Boll; M. Heilmaier;

  • 作者单位

    Institute for Applied Materials (IAM-WK) Karlsruhe Institute of Technology (KIT) Engelbert-Amold-Str. 4 D 76131 Karlsruhe Germany Karlsruhe Nano Micro Facility (KNMF) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 D 76344 Eggenstein Leopoldshafen Germany;

    Institute for Applied Materials (IAM-WK) Karlsruhe Institute of Technology (KIT) Engelbert-Amold-Str. 4 D 76131 Karlsruhe Germany;

    Institute for Applied Materials (IAM-WK) Karlsruhe Institute of Technology (KIT) Engelbert-Amold-Str. 4 D 76131 Karlsruhe Germany;

    Institute for Applied Materials (IAM-WK) Karlsruhe Institute of Technology (KIT) Engelbert-Amold-Str. 4 D 76131 Karlsruhe Germany Karlsruhe Nano Micro Facility (KNMF) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 D 76344 Eggenstein Leopoldshafen Germany;

    Institute for Applied Materials (IAM-WK) Karlsruhe Institute of Technology (KIT) Engelbert-Amold-Str. 4 D 76131 Karlsruhe Germany;

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  • 正文语种 eng
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  • 关键词

    ODS steel; High-Mn steel; Mechanical alloying; Microstructure characterization; Strengthening mechanisms;

    机译：ODS钢;高Mn钢;机械合金化;微观结构特征;加强机制;

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