TC21钛合金固溶时效处理对合金强韧化性能的影响

Effect of Solid Solution and Aging Treatment on the Strength and Toughness of TC21 Titanium Alloy

本文研究了TC21钛合金经两相区固溶处理快速冷却后,合金显微组织、室温拉伸性能及室温冲击性能随时效制度的变化规律。研究表明,TC21钛合金在两相区进行固溶处理时快速冷却后,随着时效时间的延长,合金组织中初生α相尺寸增大,但抗拉强度有所下降,塑性变化不明显。随着时效温度的升高,合金组织中的初生α相尺寸增大,合金的强度明显下降,塑性提高。TC21钛合金在两相区固溶处理快速冷却下,通过900℃保温120 min、水冷(WC),600℃保温360 min、空冷(AC)的热处理工艺,可使合金具有最佳的强度和塑性匹配。

The effects of aging temperature and time on microstructure,room temperature tensile properties and impact properties of TC21 titanium alloy after rapid cooling in two-phase field solution treatment were investigated and discussed.The results show that the size of primaryαphase increases with the increase of aging time,but room temperature tensile strength decreases,and the plasticity has no obvious change.The size of primaryαphase and the plasticity increases with the increase of aging temperature,but room temperature tensile strength decreases obviously.TC21 titanium alloy can achieve the best strength and plasticity matching through the heat treatment process of 900℃insulation for 120 min followed by water cooling(WC),and 600℃insulation for 360 min followed by air cooling(AC)under the rapid cooling of two-phase solid solution treatment.