Abstract
To avoid the phenomenon of abnormal grain coarsening, and increase the Young’s modulus of forgings, an infrared heat treatment was used on different mass forgings and compared with the results of an air furnace heat treatment. This work focused on the effects of microstructural evolution and the mechanical properties of two different mass 6082 real forgings. The experimental results show that infrared heat treatment can effectively reduce the mass effect after heat treatment, inhibit the coarse grains formed, and keep the non-equiaxed grains along the metal flows, thus significantly improving the ductility of the material. In addition, the rapid heating characteristic of infrared can effectively shorten the duration of heat treatment and greatly enhance the Young’s modulus and the vibration resistance of 6082 entity forgings.
Highlights
The 6082 alloy investigated is part of the AA6xxx (Al-Mg-Si) series of aluminum alloys.Their characteristics include light weight, high workability, strength properties, and corrosion resistance [1]; they have been widely used in the automotive industry, for example, in automobile suspension components.Most automobile suspension components are manufactured using a high temperature forging process [2,3]
The heat treatable 6082 aluminum alloy can be used with a subsequent heat treatment to achieve the desired mechanical material properties [5]; the heat treatment process is quite important in the 6082 forging process
The hardness of the L forgings after the IR heat treatment was similar to that of LAir, but the hardness of the S forgings after the IR heat treatment was higher than that of SAir. This indicates that 30 min of IR heat treatment can achieve the same solutionizing effect as that of the air furnace heat treatment
Summary
The 6082 alloy investigated is part of the AA6xxx (Al-Mg-Si) series of aluminum alloys. In this study, it is expected that the solution heat treatment and precipitation aging process can be completed in a short duration through the high penetration efficacy and short heating up characteristics of infrared heat treatment. Based on our previous research [12], rapid heat solutionizing can increase the solid solution concentration (Mg, Si atoms) and provide improved precipitation benefits; the Young’s modulus after an IR heat treatment is calculated to put forward data for the application of 6082 forgings with high vibration resistance. The findings regarding the mass effect and microstructure, respectively, and their contribution to mechanical properties are an attempt to lead to a better understanding of and improvement in heat treatments following the 6082 aluminum alloy forging process
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