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.
出处
《钛工业进展》
CAS
2014年第6期29-32,共4页
Titanium Industry Progress
基金
中航工业创新基金(2012E62120R)
关键词
新型钛合金
连续加热
相变
显微组织
new titanium alloy
continuous heating
phase transformation
microstructure
