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首页> 外文期刊>Materials Science and Engineering >Influence of microstructure on local intra- and intergranular deformations during creep of a nickel-based superalloy at 700 ℃
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Influence of microstructure on local intra- and intergranular deformations during creep of a nickel-based superalloy at 700 ℃

机译：微观结构对镍基高温合金在700℃蠕变过程中局部晶内和晶间变形的影响

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摘要

Several microstructural parameters of the NR6 nickel-based superalloy were varied by applying four heat treatment procedures. Tensile creep tests were performed in air at 700 ℃ and 700 MPa on specimens exhibiting different grain sizes, strengthening γ' precipitate sizes and distributions and grain boundary morphologies. Flat creep specimens were instrumented thanks to a dedicated microextensometry technique to analyze the local intra- and intergranular deformations after tensile creep under vacuum at 700 ℃. Tertiary γ' precipitate dissolution, grain boundary serration and larger grain size reduce grain boundary sliding contribution to overall strain. These effects are attributed to the promotion of Orowan by-passing instead of shearing of the γ' strengthening particles by matrix dislocations, increase of grain boundary resistance or decrease of grain boundary fraction. Relationships between local deformations and macroscopic creep behavior have been evidenced.
机译：通过应用四种热处理程序，可以改变NR6镍基高温合金的几个微结构参数。在700℃和700 MPa的空气中进行了拉伸蠕变试验，研究了不同晶粒尺寸的试样，强化了γ'析出物的尺寸和分布及晶界形态。通过专用的微引伸技术，对扁平蠕变样品进行了仪器分析，以分析在700℃真空下拉伸蠕变后的局部晶内和晶间变形。三次γ'析出物的溶解，晶界锯齿和较大的晶粒尺寸减小了晶界滑动对总应变的贡献。这些效应归因于基体位错促进了Orowan绕过而不是剪切γ'增强颗粒，增加了晶界阻力或降低了晶界分数。已经证明了局部变形与宏观蠕变行为之间的关系。

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