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Hot Ductility of Incoloy 901 Produced by Vacuum Arc Remelting

机译：真空电弧重熔生产的Incoloy 901的热延展性

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摘要

Hot tensile testing was adopted over the temperature range of 850℃-1 150℃ and at strain rates of 0.001 s~(-1) -1 s~(-1) to study the hot ductility of Incoloy 901. Hot ductility of the material was optimized in range of 950℃-1 050℃ and descended at either higher or lower temperatures. Dynamic recrystallization was the reason for the improvement of ductility at high temperatures. At lower temperatures, e.g. 850℃, dynamic precipitation of intermetallic phases could effectively inhibit dynamic recrystallization and resulted in poor hot ductility. At very high temperatures, e.g. 1 150℃, the hot ductility drop was due to the decohesion of particles/ matrix interfaces. The insensitivity of material to flow localization was understood from the monotonic increase of the strain rate sensitivity over the studied temperature range. The peak strain of the material unexpectedly increased with increasing temperature up to 1 050℃ and then decreased at higher temperatures. These results accounted for the possibility of dynamic precipitation of intermetallics at temperatures below 1 050℃ and thereby delaying dynamic recrystallization. The hyperbolic sine constitutive equation was used to describe the dependence of tensile stress on deformation temperature and strain rate and the corresponding material constants were determined. The average apparent activation energy for the initiation of dynamic recrystallization was determined as 359 kJ mol~(-1).
机译：通过热拉伸试验，在850℃-1 150℃的温度范围内，以0.001 s〜（-1）-1 s〜（-1）的应变速率研究Incoloy 901的热延展性。材料的热延展性在950℃-1050℃的温度范围内进行了优化，并在较高或较低的温度下下降。动态重结晶是高温下延展性提高的原因。在较低的温度下850℃时，金属间相的动态析出可以有效地抑制动态再结晶，导致热延展性差。在很高的温度下在1 150℃下，热延展性下降是由于颗粒/基体界面的脱粘。从在研究温度范围内应变率灵敏度的单调增加可以理解材料对流动局部的不敏感性。材料的峰值应变随温度的升高而意外升高，直至高达1050℃，然后在较高的温度下降低。这些结果解释了在低于1050℃的温度下金属间化合物动态沉淀的可能性，从而延迟了动态再结晶。用双曲正弦本构方程描述拉伸应力对变形温度和应变率的依赖性，并确定了相应的材料常数。确定动态再结晶起始的平均表观活化能为359 kJ mol〜（-1）。

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  • 来源
    《ISIJ international》 |2014年第6期|1353-1360|共8页
  • 作者

    Fatemeh MOHAMMADI SHORE; Maryam MORAKABATI; Seyed Mehdi ABBASI; Amir MOMENI; Rashid MAHDAVI;

  • 作者单位

    Metallic Materials Research Center (MMRC-MA), Tehran, Iran, Tehran, Iran;

    Metallic Materials Research Center (MMRC-MA), Tehran, Iran, Tehran, Iran;

    Metallic Materials Research Center (MMRC-MA), Tehran, Iran, Tehran, Iran;

    Materials Science and Engineering Department, Hamedan University of Technology, Hamedan, Iran;

    Metallic Materials Research Center (MMRC-MA), Tehran, Iran, Tehran, Iran;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    superalloys; hot tensile test; hot ductility; constitutive equation;

    机译：高温合金热拉伸试验;热延展性本构方程;

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