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淬火介质对7050铝合金末端淬特性的影响
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-11-27
采用室温水和浓度为20%的PAG水溶液 (聚烷撑二醇聚合物)作为淬火介质进行Jominy末端淬火实验，用于评价7050铝合金淬透性；监测合金固溶和淬火过程中的升温速率和冷却速率，测定距淬火端不同距离的合金的淬火态电导率和时效态硬度，观察室温水淬火试样不同位置晶内淬火析出相。
淬火介质对7050铝合金末端淬特性的影响Effect of quenching media on Jominy end quench behavior of 7050 Al alloy
采用室温水和浓度为20%的PAG水溶液 (聚烷撑二醇聚合物)作为淬火介质进行Jominy末端淬火实验，用于评价7050铝合金淬透性；监测合金固溶和淬火过程中的升温速率和冷却速率，测定距淬火端不同距离的合金的淬火态电导率和时效态硬度，观察室温水淬火试样不同位置晶内淬火析出相。结果表明：采用室温水和20%PAG进行末端淬火时，合金的淬透深度分别约为65和40 mm；采用PAG淬火可使合金温度快速通过淬火敏感区间，同时在淬火敏感区间外降低合金的冷却速率，使试样淬火端和中间部位合金的温度差减小。随着距淬火端距离的增加，淬火诱发析出的η平衡相的尺寸和体积分数增加，无析出区宽化。
The Jominy end quench test was used to evaluate the hardenability of 7050 Al alloys. The room-temperature water and 20%PAG were adopted as quenching media respectively in this test. The heating and cooling rates of the 7050 bar were monitored. The as-aged hardness and as-quenched electrical conductivity of alloys at different distances from the quenched end were collected, and the intragranular precipitates at different locations of samples quenched by room-temperature water were observed. The results indicate that the quenched depths of the alloy are 65 and 40 mm for the alloy quenched by room-temperature water and 20%PAG, respectively. The alloy can pass through the quench sensitive temperature range rapidly when quenched by 20%PAG, the cooling rate can be reduced outside that range, and the temperature difference between the quenched end and center parts of the quenched bar is decreased. The size and volume fraction of the quench induced equilibrium η phase as well as the width of the PFZs increase with the distance from the quenched end increasing.
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