首页> 外文期刊>Philosophical Magazine, A. Physics of condensed matter, defects and mechanical properties >Measurement of service-induced internal elastic strains in a single-crystal nickel-based turbine blade with convergent-beam electron diffraction
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Measurement of service-induced internal elastic strains in a single-crystal nickel-based turbine blade with convergent-beam electron diffraction

机译:用会聚束电子衍射测量单晶镍基涡轮叶片中服务引起的内部弹性应变

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During tensile creep deformation, single-crystal nickel-based superalloys develop a characteristic internal stress state, which leads to counteracting tetragonal lattice distortions of the two phases gamma and gamma'. The aim of this work was the evaluation of the related elastic lattice distortions in the microstructure of a turbine blade after service in an accelerated mission test with high lateral resolution by convergent-beam electron diffraction. For the determination of the local lattice parameters, the higher-order Laue zone (HOLZ) lines of the central diffraction disc were evaluated under the assumption of a tetragonal distorted crystal lattice, Thr zone-axis patterns were simulated considering dynamical effects or the diffraction process. In order to reduce the computation time, a set of HOLZ line patterns was calculated in advance. Experimental patterns were compared with dynamically simulated patterns by the analysis of characteristic areas between HOLZ lines. The dependence of two area fractions on the lattice parameters were fitted by an interpolation Function. This function was used for the evaluation of the experimental patterns. With this new approach a relatively fast evaluation of lattice strains was possible. [References: 35]
机译:在拉伸蠕变变形过程中,单晶镍基高温合金会形成特征性的内部应力状态,从而抵消两相γ和γ'的四方晶格畸变。这项工作的目的是通过会聚束电子衍射评估具有高横向分辨率的加速任务测试中维修后涡轮叶片微结构中的相关弹性晶格畸变。为了确定局部晶格参数,在假设四边形扭曲晶格的情况下评估了中心衍射圆盘的高阶Laue带(HOLZ)线,并考虑了动力学效应或衍射过程模拟了Thr带轴方向图。为了减少计算时间,预先计算了一组HOLZ线条图案。通过分析HOLZ线之间的特征区域,将实验模式与动态模拟模式进行了比较。通过插值函数拟合两个面积分数对晶格参数的依赖性。该功能用于评估实验模式。使用这种新方法,可以相对快速地评估晶格应变。 [参考:35]

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