锻态QAl9-4铝青铜热处理工艺研究

Study on Heat Treatment Technology of Forged QAl9-4 Aluminum Bronze

采用正交试验研究了不同热处理工艺参数对锻态QAl9-4铝青铜合金力学性能的影响,对试验数据进行了极差分析,得出了固溶温度、固溶时间、时效温度和时效时间对性能指标影响的主次顺序及大小,并对不同热处理试样进行了SEM显微组织和形貌观察。结果表明:优化的热处理工艺为910℃固溶1 h后550℃时效5 h;使用该工艺后,合金具有较强的综合力学性能,抗拉强度、屈服强度、伸长率、布氏硬度分别为657、298 MPa、26%、172.5 HB,与锻态合金相比,分别提高了10.2%、15.1%、25%、5%。

The effects of different heat treatment process parameters on the mechanical properties of forged QA19-4 aluminum bronze alloy were studied by using orthogonal experiment. The range analysis of experimental data was carried out. The order and levels of the influence of solid solution temperature, solution time, aging temperature and aging time on the properties were obtained. The SEM rnicrostructures and morphologies of samples after different heat treatment were also observed. The results show that the optimal heat treatment technology is solution at 910℃ for 1 h and then aging at 550 ℃ for 5 h. After using this process, the alloy has good comprehensive mechanical properties- the tensile strength, yield strength, elongation and hardness of the aged alloy are 657, 298 MPa, 26% and 172.5 FIB respectively, which are improved by 10.2%, 15.1%, 25% and 5% respectively compared with those of the forged alloy.