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本文采用光学金相、电子金相、电子衍射、硬度测量及光学膨胀试验等方法,研究了Ti-6.5Al-3.5Mo-2Zr-0.25Si(BT9)合金的等温转变过程,建立了它的自1020℃(β相区)固溶而后过冷到不同温度的等温转变图,确定了等温温度、转变产物的组织形态和机械性能(室温拉伸)之间的关系;并初步探讨了BT9合金等温转变的机理。试验还证明,钛合金的马氏体转变开始点M,与过冷β相的冷却速度有关,冷速愈快,M_s点愈低。
In this paper, the isothermal transformation process of Ti-6.5Al-3.5Mo-2Zr-0.25Si (BT9) alloy was studied by means of optical metallography, electronic metallography, electron diffraction, hardness measurement and optical expansion test. The relationship between isothermal temperature, microstructure and mechanical properties (tensile at room temperature) of isothermal transformation was determined at 1020 ℃ (β phase region) and then subcooled to different temperature. The effects of isothermal The mechanism of change. The experiment also proves that the starting point M of the martensitic transformation of the titanium alloy is related to the cooling rate of the supercooled β-phase. The faster the cooling speed, the lower the M_s point.