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Effect of deformation mode on hot ductility of a γ' precipitation strengthened nickel-base superalloy

机译：变形模式对γ'沉淀强化镍基高温合金热延展性的影响

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摘要

Disparity in hot ductility of a γ' precipitation strengthened nickel-base superalloy, IN 738 LC, subjected to non-equilibrium heating and compressive and tensile stresses, was investigated. The alloy, which shows considerable hot ductility at temperatures ranging from 1160 ℃ to 1250 ℃ under compressive loading, exhibits zero ductility under tensile loading within this temperature range. The difference is attributed to the fact that while compressive loading permits plastic deformation in spite of non-equilibrium liquid phase dissolution of γ' precipitates in the alloy, the occurrence of the liquation reaction results in inhibition of plastic deformation under tensile loading. Accordingly, while grain refinement through strain-induced dynamic recrystallization occurred under compressive loading, within the same temperature range, the formation of new grains was prevented under tensile loading. This behavior is crucial during high temperature processing of γ' precipitation strengthened nickel-base superalloys.
机译：研究了在非平衡加热和压缩应力和拉伸应力作用下，γ'沉淀增强型镍基高温合金IN 738 LC在热延展性方面的差异。该合金在压缩载荷下于1160℃至1250℃的温度下表现出相当大的热延展性，在此温度范围内在拉伸载荷下表现为零延展性。差异归因于以下事实，尽管尽管γ'沉淀在合金中发生非平衡液相溶解，但压缩载荷仍允许塑性变形，但液化反应的发生导致在拉伸载荷下塑性变形受到抑制。因此，虽然在压缩载荷下通过应变诱导的动态再结晶进行晶粒细化，但是在相同温度范围内，在拉伸载荷下防止了新晶粒的形成。在高温下处理γ'沉淀强化的镍基高温合金时，此行为至关重要。

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  • 来源
    《Materials Science and Engineering》 |2013年第15期|319-325|共7页
  • 作者

    O.T. Ola; O.A. Ojo; M.C. Chaturvedi;

  • 作者单位

    Department of Mechanical and Manufacturing Engineering, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 5V6;

    Department of Mechanical and Manufacturing Engineering, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 5V6;

    Department of Mechanical and Manufacturing Engineering, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 5V6;

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

    Nickel-base; Hot ductility; Hot workability; Liquation; Forming; Joining;

    机译：镍基;热延展性;热加工性;液化;成型;加盟;

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