(北京航空材料研究院 钛合金研究室,北京 100095)
摘 要: 研究退火温度对TC4钛合金风扇叶片动态力学性能的影响。结果表明:在普通退火温度范围内(700~800 ℃),随着退火温度的升高,材料的绝热剪切敏感性逐渐降低,吸收冲击的能量逐渐提高。采用两种固溶时效热处理工艺,在TC4风扇叶片的临界失效应变率下(3 000 s-1),研究固溶后的冷却速度对TC4钛合金风扇叶片显微组织和动态力学性能的影响。研究发现,采用较低的冷却速度使α相几乎完全等轴化,能保证叶片锻件在强度降低不明显的前提下,一定程度的提高动态应变,降低绝热剪切敏感性。
关键字: TC4钛合金;风扇叶片;绝热剪切敏感性;动态力学性能;热处理工艺
(Titanium Alloys Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China)
Abstract:The effects of annealing temperature on the dynamic properties of TC4 titanium fan blade were investigated. The results show that the adiabatic shear susceptibility is decreased and the absorbed energy is increased with increasing annealing temperature in normal heat treatment temperature range (700~800 ℃). With heat treatments, the influence of cooling rate from the solution treatment on the microstructure and dynamic mechanic properties was studied at the critical fracture strain rate of the TC4 titanium (3 000 s-1). It is found that the α phase almost completely equated and the grain size increased with decreasing cooling rate. Therefore, the dynamic strain is increased and the adiabatic shear susceptibility is decreased with the dynamic strength decrease slightly.
Key words: TC4 titanium alloy; fan blade; adiabatic shear integrality; dynamic properties; heat treatment processing