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Prediction of Microstructure and Performance Distribution of Heat-treated Parts and Structure Design by Computer Simulation Technique

Author: FengZuoZuo
Tutor: SongYuePeng
School: Shandong Agricultural University
Course: Mechanical Design and Theory
Keywords: Computer Modeling and Forecasting Heat treatment Organizational performance distribution Finite Element Analysis Structural design
CLC: TG156
Type: Master's thesis
Year: 2010
Downloads: 107
Quote: 0
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Abstract


The heat treatment process for improving the material properties of the potential to meet the mechanical parts in the processing and use of the process has an important role on the performance requirements. For a long time, organizational performance distribution of parts after heat treatment more accurate computer forecasting has not been solved. Meanwhile, the stress distribution and change parts quenching process is extremely difficult measurement, resulting in structural optimization design is lagging behind. Based on this, using computer numerical simulation and simulation, prediction and experimental verification of the organization's performance after the heat treatment of the structural steel parts distribution, and optimize the design of the structure of quenched parts based on the simulation of the stress distribution in the quenching process. First, a theoretical analysis discusses the basic principles of the finite element heat transfer, phase change and the internal stress and other content on the heat treatment process, and then developed a computer numerical simulation forecasting system in the performance of the different parts of the organization in the heat treatment of a part by a reasonable choice of steel parameters and heat treatment process in parts of the thermophysical properties of the heat transfer coefficient and the environment, and the temperature field of the induction hardening process under parts of several ordinary heat treatment (water quenching, oil quenching, normalizing, annealing) numerical simulation obtained various parts of the parts cooling rate, then combined with MERNIER model can achieve different ingredients, different structural parts after heat treatment organization and content, the more accurate the forecast of the size and distribution of hardness, thermal stress, and experimentally verify the simulation results, the results show that The system has high reliability. Stress distribution and changes for the parts in the quenching process more difficult determination of the actual situation, this paper based on the reliability of the simulation results of the temperature field in the part in the heat treatment process, the establishment of the heat - stress - structure prediction model, the thermal quenching parts - simulation of the stress field, to achieve the coupling between the three of the parts quenching process temperature - Organization - stress distribution by the maximum stress in the part quenching process, internal stress changes in the simulation forecast, optimize the design of parts of the structure so as to quench laid the foundation, while the model is an extremely important reference significance for deformation, cracks and other defects produce parts in the quenching process and prevent the same. Using this model, reaming drill on the actual production of parts of the structure design.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Heat treatment > Heat treatment process
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