Thermomechanical investigation of the production process of a creep resistant martensitic steel
Thermomechanical investigation of the production process of a creep resistant martensitic steel
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抗蠕变马氏体钢生产过程的热机械研究
DOI：
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发表时间：
2017
期刊：
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通讯作者：
B. Sonderegger
中科院分区：
文献类型：
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作者：
Bernadette Gsellmann;D. Halici;B. Krenmayr;C. Poletti;B. Sonderegger
在抗蠕变马氏体钢的生产过程中，材料的微观结构由于热机械载荷而经历许多转变。最终的显微组织特征对合金的机械性能有直接影响，例如蠕变、疲劳和耐腐蚀性以及韧性。为了研究每个生产步骤的效果，在实验室规模下以受控方式再现材料的热机械历史，以详细检查热变形期间的流动曲线。此外，在模拟生产过程的每个步骤之后，对样品进行微观结构研究。该程序概述了加工参数对材料微观结构的影响，并允许改进加工步骤。这项工作的目的是复制的生产和制造过程中的锻造零件和管的控制方式，并研究显微组织演变的现象，如再结晶和强化。为此，使用热机械模拟器Gleeble®3800研究热轧实验11%Cr钢。利用光学显微镜、扫描电镜和电子背散射衍射（EBSD）对变形后的试样进行了研究。为了进行比较，调查中包括了收到的样品。解释的微观结构的调查和获得的流动曲线在热压缩试验过程中允许动态再结晶和回复的结论。结果表明，动态回复作为主要的软化过程中的两个测试的温度，而较高的温度导致显着形成的δ铁素体。这些结果允许改进的沉淀动力学模拟，并进一步优化热机械处理相对于改善microstructure.During抗蠕变马氏体钢的生产过程中，由于热机械加载的材料的微观结构经历了一些转变。最终的显微组织特征对合金的机械性能有直接影响，例如蠕变、疲劳和耐腐蚀性以及韧性。为了研究每个生产步骤的效果，在实验室规模下以受控方式再现材料的热机械历史，以详细检查热变形期间的流动曲线。此外，在模拟生产过程的每个步骤之后，对样品进行微观结构研究。该程序概述了加工参数对材料微观结构的影响，并允许改进加工步骤。本工作的目的是再现零件的生产和制造过程中的锻造零件和管在一个控制的方式，并研究微观组织的演变。
During the production process of creep resistant martensitic steels, the microstructure of the material undergoes a number of transformations due to thermomechanical loading. The final microstructural features have direct influence on the mechanical properties of the alloy such as creep, fatigue and corrosion resistance, as well as toughness. In order to study the effect of each production step, the thermomechanical history of the material is reproduced in a controlled manner at lab scale for detailed examination of the flow curves during hot deformation. In addition, microstructural investigations are applied to samples after each step of the simulated production process. This procedure provides an overview of the influence of processing parameters on the material’s microstructure and allows the improvement of the processing steps. The objective of this work is to reproduce parts of the production and manufacturing process of forged parts and tubes in a controlled way and to study the microstructural evolution with respect to phenomena such as recrystallization and strengthening. For this purpose hot-rolled experimental 11%Cr steel is investigated using the thermomechanical simulator Gleeble®3800. The deformed samples are investigated via LOM, SEM and EBSD. For comparison, as-received samples are included in the investigations. The interpretation of the microstructural investigation and of the obtained flow curves during the hot compression tests allow conclusions on dynamic recrystallization and recovery. Results indicate dynamic recovery as main softening process for both tested temperatures, whereas the higher temperature leads to a significant formation of delta ferrite. These results allow for improved precipitation kinetic simulations, and for further optimizing the thermomechanical treatment with respect to improved microstructure.During the production process of creep resistant martensitic steels, the microstructure of the material undergoes a number of transformations due to thermomechanical loading. The final microstructural features have direct influence on the mechanical properties of the alloy such as creep, fatigue and corrosion resistance, as well as toughness. In order to study the effect of each production step, the thermomechanical history of the material is reproduced in a controlled manner at lab scale for detailed examination of the flow curves during hot deformation. In addition, microstructural investigations are applied to samples after each step of the simulated production process. This procedure provides an overview of the influence of processing parameters on the material’s microstructure and allows the improvement of the processing steps. The objective of this work is to reproduce parts of the production and manufacturing process of forged parts and tubes in a controlled way and to study the microstructural evo...