摘要
The influences of different heat treatments on the microstructure of TC17 alloy fabricated by laser solid forming (LSF) are investigated, while the alloy in three states of as-deposited, after relief annealing and aging treatment. The results indicate that the microstructure of as-deposited sample consists of coarse columnar grains which grow epitaxially from the substrate along the deposition direction z. The microstructure within the columnar grain shows typical α+β structure. The original β grains are composed of extremely fine basketweave microstructure. And the α phase has lath morphology, its length and width are 1~3 μm and 0.1~0.2 μm, respectively. After furnace cooling (FC) annealing treatment following 1 h holding at 600 °C, the length and width of the α lath both increased while the length/width ratio decreased, but no other changes can be observed. The equiaxed α phase will be observed on the β matrix after air cooling (AC) annealing treatment following 4 h holding at 550 °C. During aging treatment, the α laths coarsen continuously as the aging time increases, whereas their length/width ratio gradually decreases. When the holding time reaches 8 h, most of the α laths are spheroidized, only a few left.
源语言 | 英语 |
---|---|
页(从-至) | 847-851 |
页数 | 5 |
期刊 | Zhongguo Jiguang/Chinese Journal of Lasers |
卷 | 37 |
期 | 3 |
DOI | |
出版状态 | 已出版 - 3月 2010 |