GH4169D高温合金喷丸强化残余应力场仿真与参数化建模

Simulation and parametric modeling of residual stress field in shot peening of GH4169D superalloy

摘要

残余压应力是影响零部件性能和寿命的关键因素，主动引入并精确控制残余压应力已成为提高零部件可靠性、延长使用寿命的核心技术手段之一。本工作针对GH4169D高温合金喷丸工艺参数优化困难、残余应力场预测精度不足等问题，采用仿真与实验相结合的方法开展研究。建立考虑弹丸随机分布特性的多弹丸喷丸过程仿真模型，分析不同工艺条件下材料应变率及残余应力与塑性应变的关系，并验证随机喷丸残余应力模型的准确性。基于响应曲面法开展喷丸强化工艺实验，对比不同喷丸强度和覆盖率对残余应力影响层深度分布的影响规律，并对残余应力影响层深度分布情况进行参数化建模。结果表明，使用余弦衰减函数可对GH4169D高温合金在不同喷丸工艺下的残余应力场进行参数化建模，拟合后R²大于0.95，这些结果为GH4169D高温合金喷丸强化工艺的快速优化和残余应力场的准确建模提供有效方法。

Abstract

Residual compressive stress is a critical factor affecting the performance and service life of components. The active introduction and precise control of residual compressive stress have become one of the core technical approaches to improve component reliability and extend service life. Aiming at the difficulties in optimizing shot peening process parameters and insufficient prediction accuracy of residual stress fields for GH4169D superalloy，this work adopts a combined simulation and experimental method for investigation. A multi-shot peening simulation model considering the random distribution characteristics of shot particles is established to analyze the material strain rate as well as the correlation between residual stress and plastic strain under various process conditions，and the accuracy of the random shot peening residual stress model is verified. Shot peening strengthening experiments are carried out based on the response surface methodology. The influence laws of different shot peening intensities and coverage rates on the depth distribution of the residual stress-affected layer are compared，and parametric modeling is performed for the depth distribution of the residual stress-affected layer. The results reveal that the cosine attenuation function can realize parametric modeling of residual stress fields of GH4169D superalloy under diverse shot peening processes，with the fitted determination coefficientR ² greater than 0.95. These findings provide an effective method for rapid optimization of shot peening strengthening processes and accurate modeling of residual stress fields of GH4169D superalloy.

关键词

高温合金 / 喷丸强化 / 残余应力 / 有限元模拟 / 参数化建模

Key words

superalloy / shot peening / residual stress / finite element simulation / parametric modeling

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基金资助

太行国家实验室自主立项项目(BK133)

国家自然科学基金项目(92360309)