(中南大学 材料科学与工程学院, 长沙 410083)
摘 要: 采用分级淬火的方法测定了7055铝合金的温度—时间—性能（TTP）曲线, 并结合合金实际淬火冷却曲线通过淬火因子分析方法预测了合金的硬度。结果表明, 合金TTP曲线的“鼻尖”温度大约为355 ℃, 淬火敏感温度区间为210~420 ℃。 淬火因子分析方法预测的合金硬度值和实测值吻合较好, 淬火敏感温度区间的冷却速率对合金硬度有决定性影响。根据理论计算认为, 要获得最大硬度, 淬火敏感温度区间的平均冷却速率需大于500 ℃/s。
关键字: 7055铝合金； 温度—时间—性能曲线； 淬火因子分析方法；淬火速率； 硬度
its application
（School of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: The temperature—time—property (TTP) curve of 7055 aluminum alloy was evaluated by interrupted quenching method. The results show that the critical temperature range is 210-420 ℃ with the nose temperature of about 355 ℃. Combined with measured cooling curves, the TTP curve was used to predict the influence of quenching rate on the hardness of 7055 aluminum alloy by quench factor analysis method. And the predicted results agree reasonably well with the measured values. The quenching rate through the critical temperature range has great influence on the hardness of the alloy, and that must be larger than 500 ℃/s in order to attain the highest hardness.
Key words: 7055 aluminum alloy; temperature—time—property(TTP)curve; quench factor analysis method; quenching rate; hardness
