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Precipitation and austenite reversion behavior of a maraging steel produced by selective laser melting

机译：选择性激光熔化生产的马氏体时效钢的析出和奥氏体回复行为

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摘要

Materials produced by selective laser melting (SLM) experience a thermal history that is markedly different from that encountered by conventionally produced materials. In particular, a very high cooling rate from the melt is combined with cyclical reheating upon deposition of subsequent layers. Using atom-probe tomography (APT), we investigated how this nonconventional thermal history influences the phase-transformation behavior of maraging steels (Fe-18Ni-9Co-3.4Mo-1.2Ti) produced by SLM. We found that despite the "intrinsic heat treatment" and the known propensity of maraging steels for rapid clustering and precipitation, the material does not show any sign of phase transformation in the as-produced state. Upon aging, three different types of precipitates, namely (Fe,Ni,Co)_3(Ti,Mo), (Fe,Ni,Co)_3(Mo,Ti), and (Fe,Ni,Co)_7Mo_6 (μ phase), were observed as well as martensite-to-austenite reversion around regions of the retained austenite. The concentration of the newly formed phases as quantified by APT closely matches thermodynamic equilibrium calculations.
机译：通过选择性激光熔化（SLM）生产的材料经历的热历史与传统生产的材料所经历的热历史显着不同。特别地，来自熔体的非常高的冷却速率与在随后的层的沉积时的周期性再加热相结合。使用原子探针层析成像（APT），我们研究了这种非常规的热历史如何影响SLM生产的马氏体时效钢（Fe-18Ni-9Co-3.4Mo-1.2Ti）的相变行为。我们发现，尽管进行了“固有热处理”，并且已知马氏体时效钢具有快速聚集和析出的倾向，但该材料在生产状态下并未显示出任何相变迹象。随着时间的流逝，三种不同类型的析出物，即（Fe，Ni，Co）_3（Ti，Mo），（Fe，Ni，Co）_3（Mo，Ti）和（Fe，Ni，Co）_7Mo_6（μ相） ），以及在残余奥氏体区域附近的马氏体到奥氏体的回复。通过APT量化的新形成相的浓度与热力学平衡计算非常匹配。

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  • 来源
    《Journal of Materials Research》 |2014年第17期|2072-2079|共8页
  • 作者

    Eric A. Jaegle; Pyuck-Pa Choi; Jan Van Humbeeck; Dierk Raabe;

  • 作者单位

    Department Microstructure Physics and Alloy Design, Max-Planck-Institut fuer Eisenforschung GmbH, Duesseldorf 40237, Germany;

    Department Microstructure Physics and Alloy Design, Max-Planck-Institut fuer Eisenforschung GmbH, Duesseldorf 40237, Germany;

    Department of Metallurgy and Materials Engineering, KU Leuven, Leuven 3001, Belgium;

    Department Microstructure Physics and Alloy Design, Max-Planck-Institut fuer Eisenforschung GmbH, Duesseldorf 40237, Germany;

  • 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);
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  • 正文语种 eng
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