Creep Life Evaluation of Local Low Hardness P91 Head Based on Image Method
P91 head with local low hardness found in A repair metal inspection of a power plant is taken as the research object.The remaining life is evaluated by isotherm extrapolation method and the accuracy of the calculation results is analyzed.The results show that the hardness and stress of the head are very sensitive to the residual life evaluation of the head.In order to improve the evaluation accuracy of residual life of local low hardness head.The grid hardness test and data acquisition of the head and non-line fitting of the overall hardness of the head were carried out.The image method was used to extract and quantify the low hardness area of the head,and the residual life of the low hardness area of the head under the action of stress in this position can be calculated by combining with the stress analysis results of the finite element method.Compared with the traditional isotherm extrapolation method,the life evaluation method based on image processing method has higher accuracy and is suitable for local low-hardness pressure pipe fitting,which can provide a new idea for technicians to deal with local low-hardness pipe fitting.
life evaluationlocalized low hardnessP91picture processing
万方数据
维普
