新型钛合金连续加热过程中的相变研究  

Research on Phase Transformation in A New Titanium Alloy During Continuous Heating

作　　者：费跃[1] 王新南[1] 朱知寿[1] 商国强[1] 李静[1] 祝力伟[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《钛工业进展》2014年第6期29-32,共4页Titanium Industry Progress

基　　金：中航工业创新基金(2012E62120R)

摘　　要：采用热膨胀法和金相法研究了以5℃/min的加热速率连续加热某Ti-Al-Mo-Cr-Zr-Si系新型钛合金过程中的相变过程、组织演变规律以及α相→β相的转变速率。结果表明：该合金连续加热过程中,在280～505℃温度范围内,板条状α相逐渐长大,且含量逐渐增多,发生β→α相变;在505～610℃温度范围内,板条状α相变细、变短,发生由短程扩散控制的α→β相变,此阶段温度对α相→β相的转变速率影响不大;在610～930℃温度范围内,板条状α相含量明显减少,直至消失,发生由长程扩散控制的α→β相变,此阶段α相→β相的转变速率随着温度的升高明显加快,当温度达到900℃时,α相→β相的转变速率逐渐减缓。Abstract： The phase transformation, microstructure evolution rule and rate of α→β transformation in a new titanium alloy during continuous heating at 5 ℃/rain heat methods. The results showed that the lathy-shaped rate have been studied by thermal dilatometer and metallographic α phase grew up and increased gradually in the range of 280 ℃ to 505 ℃ during continuous heating, and the β→α transformation occurred. The lathy-shaped α phase became finer and shorter in the range of 505 ℃ to 610 ℃, and the α→β transformation occurred which was controlled by short-range diffusion. The temperature did not influence the rate of α→β transformation obviously in this stage. The lathy-shaped a phase decreased significantly, until disappeared in the range of 610 ℃ to 930 ℃, and the α→β transformation occurred which was controlled by long-range diffusion. In this stage, the rate of α→β transformation increased with the increasing temperature at first, when the temperature reached 900 ℃, the rate of α→βtransformation slowed down gradually.

关 键 词：新型钛合金 连续加热 相变 显微组织 

分 类 号：TG146.23[一般工业技术—材料科学与工程]