摘要
采用X射线衍射(XRD)对TC21钛合金β热处理后,经不同冷却速率冷却及双重退火后的相结构进行了分析,并用扫描电镜(SEM)和透射电镜(TEM)对显微组织和相的形貌特征进行了观察研究。结果得出,TC21钛合金在β处理时经炉冷和水冷后,合金由α和β两相组成。空冷状态下,合金主相为α+β,并有少量Nb3Si相析出。实验证明,冷却速率主要影响α和β相含量的比例,相的组成基本不受冷却速率的影响。合金经970°,30min,空冷+600℃,4h退火后,仍由α相和β相组成,没有发现新的析出相,但观察到转变β相中存在次生析出的细小针状α相。
The phase structure of titanium alloy TC21 that was IS-quenched with different cooiling rate and double annealing was analyzed by XRD, and the microstructure and morphology was observed by SEM and TEM. The results showed that the structure of titanium alloy TC21 IS-quenched with cooiling in fumace and water coiling is composed of α and β phase, under the air coolling condition, the main phases are α＋β with a little precipitated Nb3Si phase. The tests demonstrate that the proportion of α to β changed with change of the coolling rate vhile the principal phase composition kept constant. For titanium alloy TC21 heating at 970 ℃ for 30 min and quenching with air coolling, and following by annealing at 600 ℃ for 4 h, the structure still consisted of α and β without any other phase appearance, but the secondary α phase with fine needle precipitated in the β was observed.
出处
《稀有金属快报》
CSCD
2006年第12期23-27,共5页
Rare Metals Letters
