• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 2007, Vol. 43 ›› Issue (10): 211-214.

• 论文 • 上一篇    下一篇

基于遗传规划方法的汽轮机转子钢热脆化性能预测

张胜寒;范永哲;陈颖敏   

  1. 华北电力大学环境科学与工程学院;河北工业大学材料科学与工程学院
  • 发布日期:2007-10-15

GENETIC PROGRAMMING APPROACH TO PREDICTING THE TEMPER EMBRITTLEMENT OF ROTOR STEELS

ZHANG Shenghan;FAN Yongzhe;CHEN Yingmin   

  1. School of Environmental Science and Engineering, North China Electric Power University School of Material Science and Engineering, Hebei University of Technology
  • Published:2007-10-15

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摘要： 在汽轮机转子钢热脆性无损检测技术的开发中，将遗传规划法应用到30Cr2MoV钢韧脆性转变温度预测模型的建立中，以提高检测精度。把材料的脆性转变温度作为预测模型的因变量，将单环动电位再活化法测得的峰值电流密度、电解液温度、材料的化学成分参数(J参数)、材料中Cr质量分数、S质量分数、材料的维氏硬度和晶粒度作为自变量，将因变量和自变量的试验测定结果分为训练样本数据和检验样本数据。依据训练样本数据，经过遗传规划法求得最优预测模型，并用检验样本数据对所得的预测模型进行检验。结果表明：所得模型的预测误差为±20 ℃，精度较高。因此可以将遗传规划法应用到汽轮机转子钢预测模型的建立中。

关键词: 电化学极化, 汽轮机转子, 热脆性, 遗传规划

Abstract: The genetic programming approach is proposed to predict temper embrittlement of rotor steel (30Cr2MoV). Two independent data sets are obtained experimentally: training data and verifying data. Peak current density of reactivation, temperature of electrolyte, the general chemical composition parameter (J-factor), chemical composition of Cr and S, hardness and the grain size parameter of the material are used as independent variables, while fracture appearance transition temperature as dependent variable. On the basis of training data, the best model is obtained by genetic programming, and the accuracy of it is verified with the verifying data. The prediction error of the model is within the scatter of ±20 ℃. The results suggest that, the prediction model obtained by genetic programming is feasible and effective.

Key words: Electrochemical polarization, Genetic programming, Steam turbine rotor, Temper embrittlement

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