铝合金一般是在室温水中淬火,由于水的冷却速度大,会在工件内引起内应力和形成裂纹。而在油中淬火时,零件的翘曲虽然减小,但是因为冷却速度较小而导致固溶体部分分解,从而使抗腐蚀性能变坏。当使用沸水和液氦冷却时,薄膜沸腾状态被延长,因而使翘曲和形成裂纹的机率明显减小,这样能使校正工 Aluminum alloy is generally quenched in water at room temperature, due to the cooling rate of water, will cause internal stress in the workpiece and the formation of cracks. When quenched in oil, the warpage of the part is reduced, but the solid solution partially decomposes because of the cooling rate, so that the corrosion resistance deteriorates. When using boiling water and liquid helium cooling, the film is extended boiling state, thus making the probability of warping and crack formation significantly reduced, so that the correction