(北京有色金属研究总院 有色金属材料制备加工国家重点实验室，北京 100088)
摘 要: 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。
关键字: 7050铝合金；Jominy 末端淬火; 淬火介质; 淬透性
Jominy end quench behavior of 7050 Al alloy
（State Key Laboratory of Nonferrous Metals and Processes,
General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract: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.
Key words: 7050 Al alloy; Jominy end quench; quenching media; hardenability
