基于有限元法的7050铝合金厚板淬火硬度模拟

摘要

将基于铝合金析出动力学的淬火因子分析(QFA)方法与有限元分析方法相结合,先计算了7050铝合金厚板喷淋淬火过程的淬火敏感因子,然后对末端淬火试样的硬度进行了有限元模拟,分析了板厚和喷水压力对淬火硬度的影响,最后用末端淬火试验对模拟结果进行了验证.结果表明:喷水压力的下降会造成淬火后合金板硬度的下降,板的厚度越大,喷水压力的影响程度越弱;对于厚度较薄(50 mm)的板材,淬透效果与喷水压力密切相关,喷水压力从500 kPa降低至10 kPa时,其心部硬度会下降1.8%;喷水压力对厚度超过100 mm的板材淬透效果的影响有限,喷水压力从500 kPa降低至10 kPa时,心部硬度的下降小于0.5%.%The quenching factor analysis(QFA) method based on precipitation kinetics of aluminum alloy is combined with the finite element analysis method (FEM) to calculate the quenching sensitivity factor for the spray quenching process of 7050 aluminum alloy thick plate;and then the hardness of end-quenched sample was simulated, the effects of the plate thickness and the spray pressure on quenched hardness were analyzed.At last, the simulation results are verified by end quenching experiment.The results show that the decrease of spray pressure will cause loss of hardness, and the influence of water pressure decreases with the increase of plate thickness.The quenching effect of thin plate(thickness of 50 mm) is closely related to the spray pressure, when the spray pressure reduced from 500 kPa to 10 kPa, the core hardness decreased by 1.8%.The quenching effect of thick plate with thickness more than 100 mm is limited related to the spray pressure, when the spray pressure reduced from 500 kPa to 10 kPa, the decrease of core hardness was lower than 0.5%.