Post-treatment Process of Semi-solid Powder Rolling |
| |
Authors: | Xia Luo Yun-Zhong Liu Bin Wang |
| |
Affiliation: | 1.National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China2 School of Materials Science and Engineering, Southwest Petroleum University, Sichuan 610500, China |
| |
Abstract: | Semi-solid powder rolling is a strip manufacturing process, which combines powder rolling with semi-solid rolling in one step to prepare high-performance metallic strips. A total of 7050 aluminum alloy strips were prepared by semi-solid powder rolling and then used to study the post-treatment process and evaluate qualities of post-treated strips. Three post-treatment processes involving sintering, pre-sintering—cold deformation—sintering, and hot rolling were used to process the semi-solid powder rolled strips. The results show that both swelling of pores and densification occur during solid-state sintering while microhardness increases. The decrease in density is due to that the swelling of pores has a larger effect on the density change than that of densification. The relative density reaches 92.6% with the maximum microhardness of 300 HV after “pre-sintering—cold deformation—sintering” process. High microhardness is due to the ultra-fine secondary particles uniformly distributed within the grains. The microhardness and relative density of a hot rolled strip are 176 HV and 99%, respectively, and the secondary particles disappear. Occurrence of recrystallization in these three post-treatment processes makes the grains finer. |
| |
Keywords: | Semi-solid powder rolling Post-treatment Sintering Hot rolling Pore swelling |
本文献已被 CNKI 等数据库收录! |
| 点击此处可从《金属学报(英文版)》浏览原始摘要信息 |
|
点击此处可从《金属学报(英文版)》下载全文 |
|