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首页> 外文期刊>Materials Science and Engineering >Precipitation sequence and its effect on age hardening of alumina-forming austenitic stainless steel
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Precipitation sequence and its effect on age hardening of alumina-forming austenitic stainless steel

机译：析出顺序及其对形成氧化铝的奥氏体不锈钢的时效硬化的影响

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摘要

The precipitation sequence during ageing of Fe-14Cr-20Ni-0.9Nb-2.5Al based alumina-forming austenitic (AFA) steel was explored through a transmission electron microscopy analysis and a small angle neutron scattering experiment. The samples were aged at 700 ℃ for up to 504 h. Particles of NbC, M_(23)C_6 and Ni_3Al-type L1_2 were observed in the early stage of ageing. Metastable L1_2 particles were formed both in grain interior and along grain boundary. M_(23)C_6 carbides precipitated along grain boundary accompanied with precipitation of L1_2 particles. After ageing for longer than 48 h, particles of B2-NiAl and Laves-Fe_2Nb were newly formed. We suggest the possibility of phase transition from L1_2 to B2 with increase in ageing time. Finally, this study examined the change of mechanical properties during ageing through a Gleeble hot tension test and a Vickers hardness test, and then the relationship between precipitation behavior and mechanical properties was carefully investigated and discussed in terms of precipitation behavior.
机译：通过透射电子显微镜分析和小角度中子散射实验，探索了Fe-14Cr-20Ni-0.9Nb-2.5Al基氧化铝形成奥氏体（AFA）钢在时效过程中的析出顺序。样品在700℃时效达504 h。在老化的早期阶段观察到NbC，M_（23）C_6和Ni_3Al型L1_2的颗粒。在晶粒内部和沿晶界都形成了亚稳态的L1_2粒子。 M_（23）C_6碳化物沿晶界析出，伴随有L1_2粒子的析出。老化超过48小时后，新形成了B2-NiAl和Laves-Fe_2Nb颗粒。我们建议随着老化时间的增加从L1_2到B2相变的可能性。最后，本研究通过Gleeble热拉伸试验和维氏硬度试验研究了老化过程中力学性能的变化，然后仔细研究了沉淀行为与力学性能之间的关系，并就沉淀行为进行了讨论。

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  • 来源
    《Materials Science and Engineering》 |2015年第1期|72-81|共10页
  • 作者

    Joonoh Moon; Tae-Ho Lee; Yoon-Uk Heo; Young-Soo Han; Jun-Yun Kang; Heon-Young Ha; Dong-Woo Suh;

  • 作者单位

    Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, Changwon, Gyeongnam 642-831, Republic of Korea;

    Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, Changwon, Gyeongnam 642-831, Republic of Korea;

    Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Gyeongbuk 790-784, Republic of Korea;

    Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Republic of Korea;

    Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, Changwon, Gyeongnam 642-831, Republic of Korea;

    Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, Changwon, Gyeongnam 642-831, Republic of Korea;

    Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Gyeongbuk 790-784, Republic of Korea;

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  • 正文语种 eng
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  • 关键词

    Alumina-forming austenitic (AFA) steel; Ageing; Precipitation behavior; Cleeble hot tension test;

    机译：氧化铝形成奥氏体（AFA）钢;老化;降水行为;球囊热张力测试;

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