In order to improve the high temperature and low cycle fatigue performance of the IN713C alloy, trace amounts of yttrium (Y) element were added to such an alloy. The effect of Y on the microstructure and fatigue performance under push-pull loading condition of the IN713C alloy at 650 °C was investigated, and the fracture mechanisms of the IN713C alloy with different Y additions at strain amplitudes of 0.3%, 0.4% and 0.5% were also investigated. The results showed that addition of Y significantly increased the fatigue life of the IN713C alloy under different strain amplitude values. Compared with the traditional IN713C, the fatigue life of the alloy with 300 ppm Y was increased by 44.4%, 213.3%, and 61.4%, and that of the alloy with 500 ppm Y was increased by 184.6%, 66.1%, and 172.1%, respectively, at the strain amplitudes of 0.3%, 0.4%, and 0.5%. Shrinkage pores were found to be the main crack source at low strain amplitude (0.3%), while carbides and other interdendritic precipitates were the source of cracks at high strain amplitude (0.4% and 0.5%). The addition of Y increased the fatigue life of the IN713C alloy by reducing shrinkage and refining carbides and grain size.

中文翻译：

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钇对高温合金IN713C高温显微组织和低周疲劳性能的影响


为了提高IN713C合金的高温和低周疲劳性能，在该合金中添加了微量的钇（Y）元素。研究了Y对IN713C合金在650 ℃推拉加载条件下显微组织和疲劳性能的影响，以及不同Y添加量的IN713C合金在应变幅为0.3%、0.4%和0.5时的断裂机制。 % 也进行了调查。结果表明，Y的添加显着提高了IN713C合金在不同应变幅值下的疲劳寿命。与传统IN713C相比，Y含量为300 ppm的合金疲劳寿命分别提高了44.4%、213.3%和61.4%，Y含量为500 ppm的合金疲劳寿命分别提高了184.6%、66.1%和172.1% ，分别在应变幅度为 0.3%、0.4% 和 0.5% 时。研究发现，缩孔是低应变幅（0.3%）时的主要裂纹源，而碳化物和其他枝晶间析出物是高应变幅（0.4%和0.5%）时的裂纹源。 Y的添加通过减少收缩以及细化碳化物和晶粒尺寸来提高IN713C合金的疲劳寿命。