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首页> 外文期刊>Journal of Materials Engineering and Performance >Impulse excitation study of elasticity of different precipitated microstructures in IN738LC at high temperatures
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Impulse excitation study of elasticity of different precipitated microstructures in IN738LC at high temperatures

机译：高温下IN738LC中不同析出微结构弹性的脉冲激发研究

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摘要

The elastic modulus of the cast superalloy IN738LC in various heat-treated conditions was determined with multiple specimens for each microstructure using the impulse excitation technique and the resonant frequencies while heating and cooling. Whereas the second and higher order harmonics were also excited in the high temperature range 700–1000 °C in 50 mm long specimens during controlled heating, analogous specimens 35 mm in length, impacted in similar fashion, did not excite the higher harmonics. Also, the 50 mm long specimens became excited and stayed in the second harmonic over broader temperature ranges during uncontrolled cooling inside the closed furnace. All precipitated conditions had nearly similar elastic data, varying from about 200 to 115 GPa, with small deviations, within 5%, found among multiple specimens of similar microstructures tested. Specimens with fine nano-size precipitates had a distinctly smaller rate of decrease in elastic modulus with increasing temperature, in contrast to a somewhat larger and nearly similar rate of decrease in specimens with coarse or medium-sized precipitates. This behavior is indicative of a larger average cohesive strength between the atoms and/or between the matrix and the precipitate particles in the former microstructure. The duplex size precipitate microstructure seemed to have both small and large drops in different specimens.
机译：使用脉冲激发技术以及加热和冷却时的共振频率，使用多个试样针对每个显微组织确定在各种热处理条件下铸造的高温合金IN738LC的弹性模量。尽管在受控加热期间在50 mm长的试样中在700–1000°C的高温范围内也激发了二次谐波和更高次的谐波，但长度35 mm的类似试样以类似的方式受到冲击，却没有激发更高的谐波。同样，在封闭式炉内不受控制的冷却过程中，50毫米长的试样被激发并在更宽的温度范围内停留在二次谐波中。所有沉淀条件都具有几乎相似的弹性数据，从大约200 GPa到115 GPa不等，在测试的相似微观结构的多个样本中发现的偏差很小，在5％以内。具有细纳米尺寸沉淀物的样品，其弹性模量随温度升高的下降速率明显较小，而具有粗或中等尺寸沉淀物的样品，其下降速率则稍大且几乎相似。该行为表明在原子之间和/或在基质与沉淀物颗粒之间的平均内聚强度更大。在不同的样品中，双相尺寸沉淀物的微观结构似乎都有小滴和大滴。

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