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首页> 外文会议>International Conference on Modeling in Mechanics and Materials >Detection and analysis of high temperature fatigue fracture surface oxygen diffusion of GH4133B superalloy used in turbine disk of aero-engine
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Detection and analysis of high temperature fatigue fracture surface oxygen diffusion of GH4133B superalloy used in turbine disk of aero-engine

机译：空气发动机涡轮盘GH4133B超合金高温疲劳断裂表面氧气扩散的检测与分析

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摘要

The chemical contents on the fatigue fracture surface of GH4133B superalloy piece suffering tension-tension fatigue and operated at high temperature 600 °C is analyzed using an energy dispersive spectrometer,and the element content percentages at the position of carbide inclusion and that of second-phase particle in the fatigue source region are measured.It is shown that under the conditions of high temperature and air environment,the carbon element in the carbide inclusion can be easily oxidized,which results in accelerating fatigue crack nucleation and microcrack generation,reducing the fatigue crack initiation lifetime.The oxygen concentration is detected on the fatigue fracture surface along the crack propagation direction,the oxygen diffusion model is constructed,and the oxygen concentration gradient equation is derived.It is found that the oxygen content decreases gradually along the crack propagation direction,suggesting that at the crack initiation and short crack propagation stage,the alloy element reacts sufficiently with oxygen for a long time,and the oxidation accelerates the crack initiation,while at the long crack growth stage,the crack propagation rate is faster,so the alloying elements do not have adequate time for reacting with oxygen,resulting in the low oxygen content,and the oxidation has a small influence on the long crack propagation rate.
机译：使用能量分散光谱仪分析GH4133B超合金件的疲劳裂缝表面上的疲劳断裂表面的化学含量，并在高温600℃下操作，并在碳化物夹杂物的位置处的元素含量百分比和第二阶段的元素含量百分比测量疲劳源区中的颗粒。显示在高温和空气环境的条件下，碳化物夹杂物中的碳元件可以容易地氧化，这导致加速疲劳裂纹成核和微裂纹产生，减少疲劳裂纹启动寿命。沿着裂缝传播方向在疲劳断裂表面上检测到氧浓度，构造氧漫射模型，衍生氧浓度梯度方程。发现氧含量沿裂纹传播方向逐渐降低，建议在裂缝启动和短裂纹传播时合金元件长时间与氧气充分反应，氧化加速裂纹引发，而在长裂纹生长阶段，裂纹传播速率更快，因此合金元素没有足够的时间与氧气反应，导致氧含量低，氧化对长裂纹繁殖率具有小的影响。

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