淬火介质参数对铝合金板材残余应力水平的影响研究

Research on Quenching Medium Parameters on Residual Stresses in Aluminum Alloy Plates

文章采用钻孔法测试不同淬火介质、不同水温以及不同浓度PAG溶液的淬火残余应力,分析淬火介质对残余应力水平与分布的影响规律,为淬火介质的选择提供试验依据。结果表明:淬火介质参数对淬火残余应力的影响规律为:随着水温的升高,淬火残余应力逐渐降低,与20℃水淬相比,80℃水淬后残余应力降低比例约60%;随着PAG浓度的升高,淬火残余应力逐渐降低,与20℃水淬相比,15%PAG淬火后残余应力降低比例最大达72.9%;在各淬火介质参数下7055铝合金厚板淬火残余应力水平为10%NaCl+KNO_(3)溶液>20℃水>5%PAG溶液,其中10%NaCl+KNO_(3)溶液淬火后应力水平较20℃水淬提升约20%。

This study employs the hole-drilling method to test the quenching residual stress under various quenching media,different water temperatures,and different concentrations of PAG solution.The influence of quenching media parameters on the level and distribution of residual stress was analyzed.It provides an experimental basis for quenching media selection.The results show that the effect of quenching media parameters on quenching residual stress follows this pattern:as the water temperature increases,quenching residual stress gradually decreases.Compared to quenching with 20℃water,quenching with 80℃water reduces the residual stress by approximately 60%.With an increase in PAG concentration,quenching residual stress progressively decreases.When compared to quenching with 20℃water,quenching with 15%PAG solution results in the most significant reduction of residual stress,up to 72.9%.Under the parameters of various quenching media,the quenching residual stress levels for 7055 aluminum alloy thick plates are in the following order:10%NaCl+KNO_(3)solution>20℃water>5%PAG solution.Notably,quenching with 10%NaCl+KNO_(3)solution increases the stress level by approximately 20%compared to quenching with 20℃water.