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首页> 外文期刊>Materials Science and Engineering >Hot compression deformation characteristics and microstructural evolution of a Co-Cr-Mo-C alloy: Effect of precipitate and martensitic transformation
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Hot compression deformation characteristics and microstructural evolution of a Co-Cr-Mo-C alloy: Effect of precipitate and martensitic transformation

机译：Co-Cr-Mo-C合金的热压缩变形特性和组织演变：沉淀和马氏体转变的影响

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摘要

The hot compression behavior of a Co-Cr-Mo-C alloy was studied in the temperature range of 1100-1200 ℃ and the strain rate of 0.001-1 s~(-1). The influence of processing parameters including temperature and strain rate on the microstructure of the alloy was investigated. The flow curves of the hot compressed samples at the investigated deformation temperatures and strain rates exhibited single peak stress. The effect of the strain rate and temperature of deformation on the flow stress was studied using a hyperbolic sine-type equation. The calculated activation energy was about 744.5984 kJ/mol. The evidenced microstructural characteristics combined with the shape of the flow curves indicate that there is a competition between dynamic recrystallization (DRX) and precipitation phenomena, especially at low strain rates, i.e. 0.001 s~(-1). The formation of precipitates at the grain boundaries prevent the mobility of boundaries and also cause the partial inhibition of the dynamic recrystallization. Whereas, long time for the precipitates coarsening causes the predomination of dynamic recrystallization. Thus, the serrated boundaries in microstructure along with oscillation in the flow curves take place due to this competition.
机译：研究了Co-Cr-Mo-C合金在1100-1200℃的温度范围和0.001-1 s〜（-1）的应变速率下的热压缩行为。研究了包括温度和应变率在内的工艺参数对合金显微组织的影响。在研究的变形温度和应变速率下，热压缩样品的流动曲线表现出单峰应力。使用双曲正弦型方程研究了应变率和变形温度对流动应力的影响。计算的活化能为约744.5984 kJ / mol。明显的微观结构特征与流动曲线的形状相结合表明，动态重结晶（DRX）与沉淀现象之间存在竞争，特别是在低应变速率（即0.001 s〜（-1））下。在晶界处沉淀物的形成阻止了晶界的迁移，并且还部分抑制了动态再结晶。然而，长时间的析出物粗化会导致动态再结晶占主导地位。因此，由于这种竞争，发生了微观结构中的锯齿状边界以及流动曲线中的振荡。

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  • 来源
    《Materials Science and Engineering》 |2016年第7期|383-392|共10页
  • 作者

    F.Z. Hassani; M. Ketabchi; G.R. Ebrahimi; S. Bruschi;

  • 作者单位

    Mining and Metallurgical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran;

    Mining and Metallurgical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran,Amirkabir University of Technology (Tehran Polytechnic), Hafez Street, Enghelab Avenue, Tehran, Iran;

    Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar, Iran;

    Department of Industrial Engineering, University of Padua, Via Venezia 1, 35131 Padua, Italy;

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  • 正文语种 eng
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  • 关键词

    Cobalt-base alloy; Hot deformation; Recrystallization; Precipitates; Martensitic transformation;

    机译：钴基合金;热变形;重结晶;沉淀物;马氏体转变;

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