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首页> 外文期刊>International Journal of Fatigue >Effect of inclusions on low cycle fatigue lifetime in a powder metallurgy nickel-based superalloy FGH96
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Effect of inclusions on low cycle fatigue lifetime in a powder metallurgy nickel-based superalloy FGH96

机译：夹杂物对粉末冶金镍基高温合金FGH96低循环疲劳寿命的影响

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摘要

Powder metallurgy (P/M) nickel-based superalloy FGH96 is widely used for turbine discs in aero-engines. With an increasing trend towards powder metallurgy routes for turbine discs, undesired non-metallic inclusions comparable to the grain size are unavoidably introduced during the manufacturing process. In this study, a series of strain controlled low cycle fatigue (LCF) tests were conducted on the specimens cut from a P/M FGH96 turbine disc at elevated temperature. The microscopic mechanisms of the effects of the size and inclusion location on LCF lifetime were investigated by using scanning electronic microscope (SEM) with energy dispersive X-ray spectroscopy (EDS) for the fractographic analysis of specimens. It is revealed that the P/M FGH96 superalloy is sensitive to surface defects, such as surface scratches and surface inclusion; while the specimen for which the crack nucleates from internal inclusion usually has a longer fatigue lifetime due to smaller stress concentration at the crack tip. Moreover, the inclusion involving its location and size has a significant influence on the P/M FGH96 suPeralloy's LCF lifetime. Then, a modified model was proposed to quantify the inclusion effect on the LCF lifetime. Finally, a probabilistic model based on Bayesian approach was formulated to describe the scattering in LCF lifetimes induced by random inclusions.
机译：粉末冶金（P / M）镍基高温合金FGH96被广泛用于航空发动机的涡轮盘。随着用于涡轮机盘的粉末冶金路线的增长趋势，在制造过程中不可避免地引入了与晶粒尺寸相当的不希望的非金属夹杂物。在这项研究中，在高温下对从P / M FGH96涡轮盘上切下的样品进行了一系列的应变控制低循环疲劳（LCF）测试。通过使用扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）进行样品的分形分析，研究了尺寸和夹杂物位置对LCF寿命影响的微观机理。结果表明，P / M FGH96高温合金对表面缺陷（例如表面划痕和表面夹杂物）敏感。而由于内部夹杂物导致裂纹成核的试样通常具有更长的疲劳寿命，这是由于裂纹尖端处的应力集中较小。此外，涉及其位置和大小的夹杂物对P / M FGH96 suPeralloy的LCF寿命有重大影响。然后，提出了一种改进的模型来量化对LCF寿命的夹杂效应。最后，建立了基于贝叶斯方法的概率模型来描述随机包含物在LCF寿命中的散射。

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