Method for determining remaining life of heat-resisting metal material
A heat-resistant metal, life-span technology, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of large error in prediction results and low reliability, and achieve the effect of improving efficiency, accuracy and reliability
Inactive Publication Date: 2015-03-18
德尚智能科技(扬州)有限公司
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[0004] Technical problem: In order to overcome the shortcomings of large errors and low reliability in the prediction results of the remaining service life of heat-resistant metal materials in the past, the purpose of this invention is to provide a fast, efficient and accurate method for determining the remaining service life of heat-resistant metal materials
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Embodiment 1
[0033] Taking the analysis of the remaining service life of the superheater tube using the material 15CrMoG as an example, the whole process of determining the remaining service life of the heat-resistant metal material is described below. First, 15CrMoG high-temperature creep samples were cut from superheater tube parts. It is then subjected to metallographic analysis to ensure that the tested sample does not have any defects such as surface cracks, holes, etc. that affect the creep test results. For 15CrMoG high-temperature creep specimens, a series of fracture times can be obtained by changing the high-temperature creep tensile test temperature and test stress, and the test results are shown in Table 1.
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The invention relates to a method for obtaining key parameters of a service material, particularly a method for determining remaining life of a heat-resisting metal material, the method resolves the problems that the previous method for predicating remaining life of the heat-resisting metal material has low reliability and large error. The method comprises the steps of firstly obtaining a series of creep deformation test data by experiments, then fitting three dimensional curved surfaces by a self-building model, and fitting by putting fitting result into fitting parameters repeatedly. A fitting effect of a model is judged by four parameters of SSE, R-square, Adjusted R-square, RMSE which are provided by a curved surface fitting tool in a MATLAB software, and finally the remaining life of the heat-resisting metal material is calculated based on optimum fitting parameters. According to the invention, the efficiency, accuracy and reliability for determining remaining life of the heat-resisting metal material are greatly raised.
Description
technical field [0001] The invention relates to a method for obtaining key parameters of service materials, in particular to a method for determining the remaining service life of heat-resistant metal materials. Background technique [0002] The time-temperature parameter method was developed in the 1950s. Its basic concept is that in creep rupture experiments, increasing the test temperature can shorten the test time. In short, it is derived from short-term test data at higher temperatures. Extrapolation of long-term data at lower temperatures under certain stress. Among them, the Larson-miller method is a method derived based on the steady-state creep rate equation. At present, the Larson-miller method is widely used in petrochemical, electric power and many other fields to predict the remaining life of high-temperature components made of heat-resistant metal materials. The Larson-miller expression is LMP=T(C+lgt r ), where LMP is the famous Larson-miller parameter, whi...
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IPC IPC(8): G01N3/18
Inventor 程宏辉李超
Owner 德尚智能科技(扬州)有限公司