当前位置: X-MOL 学术Mater. Sci. Eng. A › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effects of axial cold-compression on microstructure uniformity and mechanical property enhancement of large 2219 Al–Cu alloy rings
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2020-09-12 , DOI: 10.1016/j.msea.2020.140233
Wanfu Guo , Hailin He , Youping Yi , Shiquan Huang , Xianchang Mao , Jie Fang , Jianwu Huang

2219 Al–Cu alloy transition rings with a diameter stretching 5 m require further enhancement to their comprehensive mechanical properties. However, currently applied warm rolling process can lead to an uneven grain structure, which notably causes the mechanical properties to become inferior in the radial direction. Thus, an axial cold-compression process (0–9%) was performed after warm rolling to improve the mechanical properties and reduce the anisotropies of such rings. The results indicated that on increasing the cold-compression deformation, the diameter of all the grains at each location decreased after heat treatment; this caused substantial elongations in all directions. Grain refinement by cold compression was more effective on the core than on the border; the 6% cold-compression samples exhibited maximum uniformity and minimum anisotropy of grain structures, resulting in the largest elongations in the radial direction. Numerous dislocations accumulate around the secondary-phase particles in the process of cold-compression, which expanded the diffusion range of Cu atoms during solution treatment; subsequently, the number and uniformity of θ′ phases increased, thereby causing the yield strength to increase in all directions. To sum up, cold-compression after warm rolling is feasible, with the 6% cold-compression sample exhibiting the most uniform microstructure and best mechanical properties.



中文翻译:

轴向冷压缩对大型2219 Al-Cu合金环组织均匀性和力学性能的影响

直径为5 m的2219 Al-Cu合金过渡环需要进一步增强其综合机械性能。然而,当前应用的热轧工艺会导致晶粒结构不均匀,这尤其导致机械性能在径向方向上变差。因此,在热轧后进行了轴向冷压工艺(0-9%),以改善这种环的机械性能并降低其各向异性。结果表明,随着冷压缩变形的增加,热处理后各部位的晶粒直径均减小。这导致在各个方向上的大量伸长。通过冷压进行晶粒细化在核心上比边界上更有效。6%的冷压样品表现出最大的均匀性和最小的晶粒结构各向异性,导致径向最大伸长率。冷压过程中,在第二相粒子周围聚集了许多位错,从而扩大了固溶处理过程中Cu原子的扩散范围。随后,θ'相的数量和均匀性增加,从而导致屈服强度在所有方向上增加。综上所述,热轧后的冷压是可行的,其中6%的冷压样品表现出最均匀的组织和最佳的机械性能。在固溶处理中扩大了Cu原子的扩散范围;随后,θ'相的数量和均匀性增加,从而导致屈服强度在所有方向上增加。综上所述,热轧后的冷压缩是可行的,其中6%的冷压缩样品表现出最均匀的组织和最佳的机械性能。在固溶处理中扩大了Cu原子的扩散范围;随后,θ'相的数量和均匀性增加,从而导致屈服强度在所有方向上增加。综上所述,热轧后的冷压缩是可行的,其中6%的冷压缩样品表现出最均匀的组织和最佳的机械性能。

更新日期:2020-09-12
down
wechat
bug