Quenching is known as the most critical step in the sequence of heat-treating operations. The objective of quenching is to preserve the solid solution formed at the solution heat-treating temperature, by rapidly cooling to some lower temperature, usually near room temperature. The scope of this study is to construct the forming limit diagram experimentally for aluminum alloy (2024-T3) sheet, as received and after Quenching from solid solution temperature. The results which have been obtained experimentally showed that at (6 hours) after Quenching, there is a considerable effect on the FLC, Quenching increases the FLC at the as received condition in the range of (19-31 %). : .
A new method for establishing the Forming Limit curve (FLC) in sheet metal forming is introduced in this work. The method is based on varying the strain path by changing the coefficient of friction between the punch and the blank. Three finite element simulations are used for the hemispherical punch stretching test. One simulation is for the positive minor strain side and two are for the negative minor strain side of the FLC. Relations between the major and the minor strains are deduced from the results of these simulations. These relations are used to draw the FLC. The curves obtained were compared with experimental results and found to have a good agreement with them.
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