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首页> 外文会议>18th International IFHTSE congress >Heat Treatments of Fe-Mn-Si Based Alloys:Mechanical Properties and Related Shape Memory Phenomena
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Heat Treatments of Fe-Mn-Si Based Alloys:Mechanical Properties and Related Shape Memory Phenomena

机译：Fe-Mn-Si基合金的热处理：力学性能及相关的形状记忆现象

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摘要

Heat treatments are usual means for modifying alloy micro-structures and, consequently, to control mechanical properties. The aim of this work was to find suitable processes for improving the shape memory effect (SME) of Fe-Mn-Si-based alloys. In particular, we studied mechanisms that affect the plastic deformation of the austenite phase. A Fe-15Mn-5Si-9Cr-5Ni alloy was deformed by rolling at different temperatures and subsequently annealed at recovery- and recrystallization-temperature. The mechanical properties of the material after processing were evaluated by performing tension and flexure tests. The SME of room temperature deformed specimens was measured after heating them to 550℃ for shape recovery. We found that the material rolled at 800℃ followed by an annealing treatment at 650℃ recovers nearly 95 % of a 3 % deformation. In this thermo-mechanical condition, the material has a yield stress of 450 MPa and an ultimate tensile strength of 880 MPa, corresponding to a total elongation of about 16 %. Optical and electron microscopy observations show that the matrix annealed at high temperature contains a low density of defects. As a consequence, there are fewer nucleation sites for martensite and the associated SME is low. On the other hand, annealing at intermediate tempera-tures (around 650cC) produces a favorable structure containing a large density of stacking faults.
机译：热处理是改变合金微观结构，从而控制机械性能的常用手段。这项工作的目的是找到合适的工艺来改善Fe-Mn-Si基合金的形状记忆效应（SME）。特别是，我们研究了影响奥氏体相塑性变形的机理。通过在不同温度下轧制使Fe-15Mn-5Si-9Cr-5Ni合金变形，然后在恢复温度和重结晶温度下进行退火。通过进行拉伸和挠曲测试来评估加工后材料的机械性能。在将室温变形样品加热至550℃以恢复形状后，对其SME进行测量。我们发现，在800℃轧制，然后在650℃进行退火处理的材料可以恢复3％变形的近95％。在这种热机械条件下，材料的屈服应力为450 MPa，极限抗拉强度为880 MPa，对应于总伸长率约为16％。光学和电子显微镜观察表明，在高温下退火的基体含有低密度的缺陷。结果，马氏体的成核位置较少，并且相关的SME较低。另一方面，在中间温度（约650cC）下退火会产生一种良好的结构，该结构包含高密度的堆垛层错。

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  • 来源
    《18th International IFHTSE congress》|2010年|287-300|共14页
  • 会议地点 Rio de Janeiro(BR)
  • 作者

    A. Druker; A. Perotti; A. Baruj; J. Malarria;

  • 作者单位

    Facultad de Cs. Ex., Ingenieria y Agrimensura (UNR), Av. Pellegrini 250, 2000 Rosario,Argentina;

    Facultad de Cs. Ex., Ingenieria y Agrimensura (UNR), Av. Pellegrini 250, 2000 Rosario,Argentina;

    Centro Atomico Bariloche e Instituto Balseiro, 8400 San Carlos de Bariloche, Argentina;

    IFIR, CONICET-Univ. Nacional de Rosario, Bv. 27 de Febrero 210 bis, 2000 Rosario,Argentina;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    shape memory, Fe-Mn-Si, rolling, microstructures;

    机译：形状记忆，Fe-Mn-Si，轧制，显微组织;

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