锻压技术

回归双级再时效工艺对7050铝合金环形锻件组织性能的影响

英文标题：Influence of regression and double-stage re-aging process on microstructure and properties for 7050 aluminum alloy ring forgings

作者：向彪1 谢林军2 张鹏1 袁武华2

单位：1. 中国第二重型机械集团德阳万航模锻有限责任公司 2. 湖南大学

关键词：7050铝合金环形锻件回归双级再时效晶粒尺寸析出相力学性能

分类号：TG146.21;TG156.92

出版年,卷(期):页码：2023,48(2):210-214

摘要：

以7050铝合金环形锻件为研究对象，结合电子背散射衍射、透射电镜、扫描电镜以及室温拉伸测试，研究了回归双级再时效工艺对7050铝合金环形锻件轴向、周向和径向组织及拉伸性能的影响，并对回归双级再时效工艺处理后的析出相分布、锻件拉伸性能和锻件断裂机制进行了分析。结果表明：7050铝合金环形锻件回归双级再时效后的屈服强度>550 MPa、断裂强度>590 MPa，伸长率>7%，析出相以η′和η相为主，锻件径向析出相尺寸大于轴向和周向的，导致锻件轴向和周向的屈服强度和伸长率均高于径向。与回归单级再时效工艺相比，回归双级再时效工艺在缩短再时效时间的情况下，能够使锻件轴向、周向和径向均保持较好的拉伸力学性能。

For 7050 aluminum alloy ring forgings, combined with electron backscatter diffraction, transmission electron microscope, scanning electron microscope and tensile test at room temperature, the influences of regression and double-stage re-aging (RDSRA) process on the microstructure and tensile properties in the axial, circumferential and radial directions for 7050 aluminum alloy ring forgings were investigated, and the precipitated phase distribution, tensile properties of forgings and fracture mechanisms of forgings after RDSRA process treatment were analyzed. The results show that the yield strength, fracture strength and elongation of 7050 aluminum alloy ring forgings after RDSRA are greater than 550 MPa, 590 MPa, and 7%, respectively. In addition, the precipitated phases are mainly η′ and η, and the radial direction precipitated phase size of forgings is significantly larger than that of the axial and circumferential directions, resulting in higher yield strength and elongation in the axial and circumferential directions than that in the radial direction of forgings. Compared with the regression and single-stage re-aging process, the RDSRA process can maintain the good tensile mechanical properties of forgings in the axial, circumferential and radial directions under the condition of shortened re-aging time.

基金项目：

作者简介：向彪（1975-），男，学士，E-mail： b-xiang@163.com

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