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针对2219铝合金环轧件,采用硬度测试、室温拉伸试验,结合SEM、TEM进行显微组织观察与分析,研究了形变热处理工艺参数(冷变形量、时效温度及时间)对合金性能的影响。结果表明:冷变形显著影响2219环轧件的力学性能。随冷变形量的增加,合金强度先增后减,塑性下降;采用535℃固溶+3.5%冷压变形+190℃×15 h时效对2219铝合金环轧件进行形变热处理,获得的批产件力学性能满足设计指标要求,且稳定性较好;环件不同方向的力学性能差异主要体现在塑性指标上,过剩相CuAl_2的形态与分布是造成差异的主要原因;过剩相CuAl_2尺寸越小,塑性越好。
Aiming at 2219 aluminum alloy rolling ring, the microstructure was observed and analyzed by hardness test and room temperature tensile test combined with SEM and TEM. The effect of deformation heat treatment process parameters (cold deformation, aging temperature and time) on the properties of the alloy was studied . The results show that cold deformation significantly affects the mechanical properties of 2219 ring rolling. With the increase of cold deformation, the strength of the alloy increases first and then decreases, the plasticity decreases. The batch heat treatment of 2219 aluminum alloy ring rolling is carried out by the solution treatment of 535 ℃ solid solution + 3.5% cold deformation + 190 ℃ × 15 h aging. The mechanical properties of the material satisfy the design requirements and the stability is good. The difference of mechanical properties of the ring in different directions is mainly reflected in the plasticity index. The morphology and distribution of the excess phase CuAl_2 are the main reasons for the difference. The smaller the size of the excess phase CuAl_2, Plastic better.