摘要
研究了不同退火温度和退火时间对Ti-230钛合金板材显微组织和力学性能的影响。测试了不同退火工艺条件下合金薄板的强度和塑性。用金相显微镜和透射电镜观察了微观组织和析出相粒子Ti2Cu的分布。实验结果表明,随着退火温度从650℃升至790℃(保温30min),合金板材的抗拉强度从541MPa升到580MPa,延伸率从27.5%降到26%。在给定790℃,保温时间分别为5,15,30min条件下退火,其强度和延伸率变化不是十分明显。从OM和TEM对组织的观察得出,随着退火温度的升高,晶粒度明显增大,晶粒等轴化程度增加,析出的Ti2Cu粒子随退火温度的升高和保温时间的延长明显减少。采用790℃,30min退火工艺,其晶粒尺寸,Ti2Cu粒子的分布及Cu在基体中的固溶度可以达到良好的匹配,使合金获得最佳的力学性能。
The influence of different annealing temperature and time on the microstructure and performance of titanium alloy sheet Ti-230 were studied in the paper. The results show： with the raising of annealing temperature, the strength of the alloy sheet is increasing gradually, the plasticity index trends to going down; at same annealing temperature, the strength and elongation rate don＇ t vary obviously with the prolonging of the duration of holding temperature. View from the microstructure, with the raising of annealing temperature, the grain size enlarged obviously, the equal-axial degree of the grain size increased in turn, the remaining Ti2Cu particle reduced obviously; at same temperature, with the shortening of the duration, the heterogenicity of the grain in the structure raised, quantity of unequal-axial grain increased, and the quantity of remaining Ti2Cu particle increased too.
出处
《稀有金属快报》
CSCD
2007年第11期27-30,共4页
Rare Metals Letters
