热处理对TB9合金力学性能及显微组织的影响

The Effect of Heat Treatment on Mechanical Properties and MicrostructureOf TB9 Alloy

摘要:

TB9合金属于亚稳型β钛合金,热处理强化效果明显,抗腐蚀性强、本文研究了固溶处理、固溶+时效处理对TB9合金力学性能和显微组织的影响,结果表明：经过800℃-900℃固溶处理后,TB9合金强度随固溶温度提高逐渐下降,塑性变化不明显；超过820℃固溶处理时,β晶粒尺寸迅速长大； 800℃-900℃固溶处理后对时效态TB9合金强度影响不明显；塑性随固溶温度上升明显下降,延伸率从15%降低到10%,面缩率从37.5%下降到20%以下；经过820℃/30min、WQ+520℃/8h、AC固溶时效处理后α相充分析出,合金性能稳定。

Abstract:

TB9 alloy has superior strength effect through heat treatment and high corrosion resistance as metastableβtitanium alloy. The effects of solution treatment and solution followed by aging treatment on mechanical properties and microstructure of TB9 alloy were studied in this paper. The results indicate that the strength gradually decreased and the change of ductility was not obvious after solution treatment between 800℃and 900℃. The βgrains size quickly increased with the solution treatment temperature above 820℃. The influence on strength of TB9 alloy was not distinct after solution between 800℃and 900℃ and aging treatment, while the ductility obviously droped with the solution treatment temperature increasing,the elongation droped from 15% to 10% and the reduction of area droped from 37.5% to below 20%.The α phase adequately precipitated and the mechanical properties was steady after solution and aging treatment (820℃/30min、WQ+520℃/8h、AC)