(中南大學(xué) 材料科學(xué)與工程學(xué)院, 長沙 410083)
摘 要: 采用分級淬火的方法測定了7055鋁合金的溫度—時間—性能（TTP）曲線, 并結(jié)合合金實際淬火冷卻曲線通過淬火因子分析方法預(yù)測了合金的硬度。結(jié)果表明, 合金TTP曲線的“鼻尖”溫度大約為355 ℃, 淬火敏感溫度區(qū)間為210~420 ℃。 淬火因子分析方法預(yù)測的合金硬度值和實測值吻合較好, 淬火敏感溫度區(qū)間的冷卻速率對合金硬度有決定性影響。根據(jù)理論計算認(rèn)為, 要獲得最大硬度, 淬火敏感溫度區(qū)間的平均冷卻速率需大于500 ℃/s。
關(guān)鍵字: 7055鋁合金； 溫度—時間—性能曲線； 淬火因子分析方法；淬火速率； 硬度
its application
ZHANG Chong, ZHANG Xiao-yan
（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
