钛合金组织与性能调控工程实例

An Engineering Example of Microstructure and Properties Control of Titanium Alloy

对比研究了加热温度和冷却方式对现有成熟钛合金牌号组织和力学性能的影响。结果表明,当初生α相数量过多、合金强度较低时,可通过增加一次高温预处理、提高退火温度或增加冷却速率等方式,有效减少合金显微组织中的初生α相数量,实现提高合金的抗拉强度、高温持久强度、断裂韧度的调控目的;当初生α相含量过低、合金塑性与冲击韧度较低时,可通过在两相区控制退火冷却速率来提高初生α相含量,实现提高合金的拉伸塑性、冲击韧度的调控目的。

The effects of heating temperature and cooling mode on microstructure and mechanical properties of mature titanium alloys were investigated.The results indicate that when the content of primaryαphases is large and the strength is low,the amount of primaryαphases in the microstructure of the alloy can be effectively reduced by increasing a high temperature pretreatment,annealing temperature or cooling rate,implementing the regulatory purposes of improving the tensile strength,high temperature lasting strength and fracture toughness.When the content of primaryαphase is less and the plasticity and impact toughness are low,the amount of primaryαphases can be increased by controlling the annealing and cooling rate in the two-phase region to achieve the regulatory purpose of improving the tensile plasticity and impact toughness.