热轧变形对Ti-10V-2Fe-3Al合金组织和性能的影响  

Influence of hot rolling deformation on microstructure and properties of Ti-10V-2Fe-3Al alloy

作　　者：商国强[1] 朱知寿[1] 寇宏超[2] 王新南[1] 费跃[1] 常辉[2] 李金山[2] 

机构地区：[1]北京航空材料研究院,北京100095 [2]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《材料热处理学报》2013年第3期108-113,共6页Transactions of Materials and Heat Treatment

摘　　要：研究了形变温度、形变量以及双重时效工艺对Ti-10V-2Fe-3Al合金显微组织和力学性能的影响。结果表明:随着形变温度的提高,在时效过程中析出的次生α相含量逐渐增加,合金强度升高;然而,当形变温度高于相变点时,初生α相对β晶粒的钉扎作用明显减弱,使得β晶粒迅速长大,导致合金的拉伸塑性明显下降;次生α相的体积分数主要决定于形变温度,因此应变量对Ti-10V-2Fe-3Al合金力学性能的影响较小。此外,相对于单重时效工艺,由于在低温时效(300℃×8 h)时发生ω→α转变,为次生α相提供了均匀的形核点,Ti-10V-2Fe-3Al合金在低温-高温双重时效工艺中获得了更加均匀、细小的α+β显微组织,使得拉伸强度获得比较大的提高。Influences of deformation temperature, deformation amount and two-step aging on microstructure and mechanical properties of Ti-10V-2Fe-3Al alloy were analyzed. The results show that with increasing deformation temperature, the strength of the specimen increases gradually due to the increasing secondary alpha phase platelets, which precipitate from the retained 13 phase during the aging. When the deformation temperature （845℃ ） is above the beta transus temperature, the β grains grow rapidly because the pinning effect of the primary alpha phase to 13 grain becomes obviously weakened, which makes the tensile ductility decreasing significantly above Tβ region. The volume fraction of secondary alpha phase depends on the deformation temperature, so no significant influence of deformation amount on mechanical properties of Ti-IOV-2Fe-3AI alloy is observed. The two-step aging is composed of aging at 300 ℃ and aging at 500℃ ,it is observed that to phase precipitation occurs when aging at 300 ℃ and the α phase precipitation is promoted by the nucleation of α on the to particles during the followed high temperature aging at 500 ℃ , resulting in the uniform and finer distribution of α precipitates, and the tensile strength increasing obviously.

关 键 词：TI-10V-2FE-3AL合金 时效工艺 显微组织 力学性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]