| Heat-resistant and high-temperature alloys are the key materials of thermal turbine blades such as aerospace and thermal energy,and high-temperature creep performance is one of its important properties.It is of great theoretical significance and application value to establish a creep curve model with a wide adaptive expression creep process to effectively quantify the creep process and establish a creep performance database.However,creep performance simulation and creep curve prediction based on creep curve model have a wide practical significance for improving the efficiency and safety of material use and reducing the cost of material testing.Based on the basic principles and characteristics of the creep process of alloy materials,based on the idea of the insinuation method,a creep curve model suitable for expressing different types of creep processes is created,and on this basis,a series of peristaltic performance simulation studies have been carried out on heat-resistant and high-temperature alloy materials with a certain representative value,including 403 Nb Mars,Sanicro25 Austen heat-resistant steel,TiAl-Nb alloy and high temperature alloy with Ru-nickel-based monocrystalline.A model was created to express the creep curves of heat-and high-temperature alloys.After various measured stretch creep curve tests of different heat-and high-temperature alloy materials,the results show that the model can fully express the whole process and creep rate of different types of creep curves of Mars and Auschwitz heat-resistant steels,TiAl-Nb alloys and various nickel-based high-temperature alloys.Using the above model,the creep curve of 403 Nb steel and Sanicro25 steel in the experimental range can be simulated and predicted.On this basis,it is predicted that the steady-state creep rate and creep strain accuracy of the creep curve under the conditions of 403 Nb steel 600?/240 MPa,580?/260 MPa are more than 93%,and the creep life accuracy is more than 93%.Both are above 96%,and the steady-state creep rate and creep strain accuracy of the creep curve under Sanicro25 steel 700?/180 MPa are predicted to be more than 90%,and the creep life accuracy is more than 97%.At the same time,the creep performance of TiAl-Nb alloy and a single crystal high temperature alloy with Ru nickel base is simulated by this model,and the results show that TiAl-Nb alloy can be measured and simulated under stress conditions of800 to 840?,200 to 240 MPa The creep activation energy is Q-real 489.7k J/mol,Q mode493.2k J/mol,the measured stress index and the simulated stress index are n-solid 4.05,n-mode 4.07,and the simulation accuracy is respectively 99.25% and 99.51%,and the measured creep activation energy and simulated creep activation energy of Ru nickel-based monocrystalline high temperature alloys at 760 to 800?,800 to 820 MPa stress conditions were Q-solid 469.7k J/mol,respectively,Q-mode 464.7k J/mol,the measured stress index and the simulated stress index were n-solid 4.22,n-mode 4.17,respectively,with simulation accuracy of 99.00% and 98.82%,respectively The measured creep activation energy and the analog creep activation energy were Q-solid 457.3k J/mol,Q-simulation 451.7k J/mol accuracy reached 98.79% and 98.89%,respectively,with the measured stress index and the simulated stress index of n-solid 6.30 and n-mode 6.23,respectively.In addition,through the analysis of the creep model,the significance of the various parameters in the model is discussed,and some parameters are pointed out.In summary,the creep curve model established in this paper is suitable for expressing the creep process of heat-and high-temperature alloy materials,and can be used to simulate and predict the related creep performance of alloy materials. |
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