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首页> 外文期刊>Metallurgical and Materials Transactions A >Retained Austenite Decomposition and Carbide Formation During Tempering a Hot-Work Tool Steel X38CrMoV5-1 Studied by Dilatometry and Atom Probe Tomography
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Retained Austenite Decomposition and Carbide Formation During Tempering a Hot-Work Tool Steel X38CrMoV5-1 Studied by Dilatometry and Atom Probe Tomography

机译：用热膨胀法和原子探针层析成像技术研究热作工具钢X38CrMoV5-1回火过程中的残余奥氏体分解和碳化物形成

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摘要

The microstructural development of a hot-work tool steel X38CrMoV5-1 during continuous heating to tempering temperature has been investigated with the focus on the decomposition of retained austenite (Stage II) and carbide formation (Stages III and IV). Investigations have been carried out after heating to 673.15 K, 773.15 K, 883.15 K (400 °C, 500 °C, 610 °C) and after a dwell time of 600 seconds at 883.15 K (610 °C). Dilatometry and atom probe tomography were used to identify tempering reactions. A distinctive reaction takes place between 723.15 K and 823.15 K (450 °C and 550 °C) which is determined to be the formation of M3C from transition carbides. Stage II could be evidenced with the atom probe results and indirectly with dilatometry, indicating the formation of new martensite during cooling. Retained austenite decomposition starts with the precipitation of alloy carbides formed from nanometric interlath retained austenite films which are laminary arranged and cause a reduction of the carbon content within the retained austenite. Preceding enrichment of substitutes at the matrix/carbide interface in the early stages of Cr7C3 alloy carbide formation could be visualised on the basis of coarse M3C carbides within the matrix. Atom probe tomography has been found to be very useful to complement dilatational experiments in order to characterise and identify microstructural changes.
机译：已经研究了热作工具钢X38CrMoV5-1在连续加热至回火温度期间的显微组织发展，重点是残余奥氏体的分解（阶段II）和碳化物的形成（阶段III和IV）。在加热到673.15 K，773.15 K，883.15 K（400°C，500°C，610°C）之后以及在883.15 K（610°C）停留600秒之后，进行了研究。使用膨胀计和原子探针层析成像来确定回火反应。在723.15 K和823.15 K（450°C和550°C）之间发生了明显的反应，这被确定是由过渡碳化物形成M3 。第二阶段可以用原子探针的结果证明，而间接用膨胀法可以证明，表明冷却过程中新的马氏体的形成。残留奥氏体的分解开始于由纳米层间层状残留奥氏体膜形成的合金碳化物的沉淀，这些碳化物呈层状排列并导致残留奥氏体中碳含量的降低。在基体内部较粗的M3C碳化物的基础上，可以直观地看到Cr7C3C3合金碳化物形成初期在基体/碳化物界面处的替代物富集。已发现原子探针断层扫描对于补充扩张实验以表征和识别微结构变化非常有用。

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    《Metallurgical and Materials Transactions A》 |2012年第13期|p.4989-4998|共10页
  • 作者

    Christoph Lerchbacher; Silvia Zinner; Harald Leitner;

  • 作者单位

    Christian Doppler Laboratory of Early Stages of Precipitation, University of Leoben, Franz-Josef-Straße 18, 8700, Leoben, Austria;

    Böhler Edelstahl GmbH &amp Co. AG, Mariazellerstraße 25, 8605, Kapfenberg, Austria;

    Department of Physical Metallurgy and Materials Testing, University of Leoben, Franz-Josef-Straße 18, 8700, Leoben, Austria;

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