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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Thermal Annealing on Machining-Induced Residual Stresses in Inconel 718
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Effect of Thermal Annealing on Machining-Induced Residual Stresses in Inconel 718

机译：热退火在inconel 718中加工诱导的残余应力的影响

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摘要

Nickel-based alloys are widely employed in the manufacturing of aero-engines. These alloys are difficult to machine, and tensile residual stresses are generated during machining. These tensile residual stresses can negatively affect the performance of aero-engine components. Nevertheless, residual stresses can vary due to thermal or mechanical loading. These variations must be considered to evaluate the real influence of residual stresses on component behavior. This paper studies the effect of thermal loads on machining-induced residual stresses in the alloy Inconel 718. A ring-shaped Inconel 718 part was face-turned, and specimens were extracted from it. Specimens were exposed at 550 and 650 degrees C for 10 min, 1 and 10 h. Residual stresses were measured, and microstructure was observed before and after thermal exposure. Residual stress variations found after thermal exposure were the consequence of two factors: relaxation of strain bands during the early stage of exposure and diffusion-controlled creep. In addition, a modified Zener-Wert-Avrami model is proposed to predict residual stress relaxation caused by the diffusion-controlled creep. Once having fitted the modified Zener-Wert-Avrami model, the study was extended for a wider range of temperatures (400-650 degrees C). This analysis showed that surface residual stresses do not relax significantly at temperatures below 500 degrees C.
机译：镍基合金广泛应用于航空发动机的制造。这些合金很难加工，加工过程中会产生拉伸残余应力。这些拉伸残余应力会对航空发动机部件的性能产生负面影响。然而，残余应力可能因热负荷或机械负荷而变化。必须考虑这些变化，以评估残余应力对部件性能的实际影响。本文研究了热负荷对Inconel 718合金加工残余应力的影响。对环形因科镍合金718零件进行表面车削，并从中提取样本。试样在550和650℃下暴露10分钟、1小时和10小时。测量残余应力，并观察热暴露前后的微观结构。热暴露后发现的残余应力变化是两个因素的结果：暴露早期应变带的松弛和扩散控制蠕变。此外，还提出了一种修正的Zener-Wert-Avrami模型来预测由扩散控制蠕变引起的残余应力松弛。一旦安装了改进的齐纳-韦特-阿夫拉米模型，该研究就扩展到了更大的温度范围（400-650摄氏度）。该分析表明，在低于500摄氏度的温度下，表面残余应力不会显著松弛。

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