Field Simulation Study Based On 7050 ABAQUS Aluminum Specimen Quenching Temperature And Thermal Stress Field

Aging treatment and quenching cooling technology has been systematically investigated by W. Sandel and K.L. Meisner since the1920s and has gradually become one of potential technologies for the reinforcement of materials. As a final adjustment of the internal organization and performance of the parts in general, aging treatment and quenching cooling technology has become an important working procedure. Although particular organizations can be gotten and the strength of7050aluminum alloy can be increased by quenching, significantly this process will result in large magnitude of residual stress. The presence of residual stress, makes serious deformation of parts or even crack; it influences greatly the quality and life of the product. Bur quenching cooling is a quite complicated process. Heat transfer coefficient is influenced by many factors, which may be act with others. Traditional methods of measurement can not more accurately analyze and forecast temperature field and thermal stress field in the process of quenching.In order to explore the application of quenching techniques and forecast the mechanical property of parts with quenching cooling, the following contents are analyzed—the development of numerical simulation on quenching process, a numerical model of temperature field and thermal stress field in the process of quenching for aluminum alloy is established with large finite element analysis software ABAQUS. The temperature field and thermal stress field of7050aluminum alloy work pieces during quenching were studied. Result of numerical simulation and the main error source were analyzed. Finally, the main results of this research were discussed.Numerical simulation results show:1. Numerical simulation of temperature field and thermal stress field of7050aluminum alloy work pieces during quenching can be realized by means of large finite element analysis software ABAQUS.2. According to the simulated temperature fields, there is the critical time tc during quenching, when the timing of the cooling is less than the critical time tc, the cooling velocity of thick rod faster than thin rod. At time tc a wide temperature differential between thick rod and thin rod, and their cooling velocity are equal, when the timing of the cooling is more than the critical time tc,the cooling velocity of thin rod faster than thick rod.3. According to the simulated thermal stress field, numerical simulation of temperature field and thermal stress field can be realized by means of large finite element analysis software ABAQUS in the process of quenching. According to the simulated temperature fields, that there is the critical time tc during quenching, when the timing of the cooling is less than the critical time tc,the cooling velocity of thick rod faster than thin rod. At time tc, a wide temperature differential between thick rod and thin rod, and their cooling velocity are equal. When the timing of the cooling is more than the critical time tc,the cooling velocity of thin rod faster than thick rod. Based on the simulated thermal stress field, thin rod of alloy transfers from tensile stress to compressive stress, while the thick rod of that goes through compressive stress to tensile stress in the process of quenching. Then the feature of tensile stress in thick rod and compressive stress in thin rod is formed. The bow-shaped frame is gradually shrunk from the surface to the center, the stress of surface and thin rod were growing with the increasing time during the beginning stages of quenching at the end of the cooling, whole stress become flat and achieved a maximum value.