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Precipitation kinetics during aging of an alumina-forming austenitic stainless steel

机译：形成氧化铝的奥氏体不锈钢在时效过程中的沉淀动力学

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摘要

The microstructural evolution of DAFA26, an alumina-forming austenitic (AFA) stainless steel, was investigated during aging. The effect of aging at 750 ℃ and 800 ℃ on the growth of spherical γ'-Ni_3(Al, Ti) particles present in the as-processed state was studied extensively using X-ray diffraction, microhardness testing, scanning electron microscopy, transmission electron microscopy, and atom probe tomography. The γ' particles had a cube-on-cube orientation relationship with the matrix (i.e. ((010)_m//(010)_p, [100]_m// [100]_p)). The coarsening kinetics of γ'-Ni_3Al particles were in agreement with the Lifshitz, Slyozof-Wagner theory. Coarse Laves phase particles were also present in the as-processed state, and during the aging process both smaller Laves phase precipitates and B2-NiAl precipitates formed on both the grain boundaries and in the matrix. The γ' precipitates were determined to have the most impact on the room temperature hardness.
机译：研究了老化过程中形成氧化铝的奥氏体（AFA）不锈钢DAFA26的组织演变。利用X射线衍射，显微硬度测试，扫描电子显微镜，透射电子等研究了在750℃和800℃时效对加工后球形γ'-Ni_3（Al，Ti）颗粒生长的影响。显微镜和原子探针层析成像。 γ′粒子与基质具有立方对立方取向关系（即（（010）_m //（010）_p，[100] _m // [100] _p））。 γ'-Ni_3Al粒子的粗化动力学与Lifshitz，Slyozof-Wagner理论一致。粗拉夫斯相颗粒也以加工状态存在，在时效过程中，较小的拉夫斯相沉淀物和B2-NiAl沉淀物均在晶界和基体上形成。确定了γ'沉淀对室温硬度的影响最大。

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  • 来源
    《Materials Science and Engineering》 |2016年第14期|147-155|共9页
  • 作者

    Geneva Trotter; Bin Hu; Annie Y. Sun; Reed Harder; M.K. Miller; Lan Yao; Ian Baker;

  • 作者单位

    Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA;

    Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA;

    Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA;

    Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA;

    Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;

    Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;

    Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA, 14 Engineering Drive, Dartmouth College, Hanover, NH 03755, USA;

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  • 正文语种 eng
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  • 关键词

    Austenite; lntermetailics; Aging; Coarsening; Grain boundaries; Precipitation;

    机译：奥氏体内部细节;老化;粗化;晶界沉淀;

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