Partial least square method-based heat-resistant steel degradation state evaluation method

Abstract

The invention discloses a partial least square method-based heat-resistant steel degradation state evaluation method, which comprises the following steps of: (1) selecting n heat-resistant steel materials with known aging state parameters and consistent thickness as calibration samples, and detecting the calibration samples by utilizing multiple nondestructive testing methods to obtain multi-dimensional nondestructive testing parameters; (2) determining main aging factors of the heat-resistant steel material, and selecting related nondestructive testing parameters according to the main aging factors to establish a main component model so as to describe a physical relationship between aging state parameters and multi-dimensional nondestructive testing parameters; (3) correcting the residual error of the main component model, and establishing a heat-resistant steel degradation state evaluation model based on a partial least square method; and (4) carrying out nondestructive testing which is the same as that of the calibration sample on the heat-resistant steel workpiece to be evaluated, substituting all obtained nondestructive testing data into the evaluation model in the step (3), and calculating and obtaining aging state parameters of the heat-resistant steel workpiece. The method can quickly evaluate the deterioration state of the heat-resistant steel.

Description

technical field [0001] The invention relates to the technical field of performance detection of heat-resistant steel materials, in particular to a method for evaluating the deterioration state of heat-resistant steel based on a partial least square method. Background technique [0002] High-temperature and high-pressure pipes, pipe fittings, valves and other workpieces in power plants and chemical plants are usually made of metal materials that can withstand high temperature and high pressure conditions. With the prolongation of service time, metal materials gradually age. The main performance degradation mechanisms include high temperature creep, Thermal fatigue and creep-fatigue interactions. At present, destructive methods (such as pipe cutting, overall sectioning, etc.) are usually used to sample metal workpieces, and they are tested by means of long-term high-temperature creep tests (thousands to tens of thousands of hours) or short-term high-temperature tensile tests. ...

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Problems solved by technology

[0003] At present, methods such as long-term high-temperature creep test or short-term high-temperature tensile test are used to evaluate the performance degradation of metal workpieces, which are to test the workpiece under conditions similar to service conditions or accelerate them under conditions that are more severe than service conditions. Test, the test results are highly reliable, but the test cost is high, the detection period is too long, and the workpiece recovery after destructive sampling is difficult, and it is not suitable for headers, valve bodies and other components except for pipelines

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