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为了深入了解渗氢对BT16钛合金组织的影响,以获得具有优良冷镦性能的组织,采用光学显微(OM)分析和X射线衍射(XRD)分析等方法,研究了BT16钛合金渗氢后的微观组织和相组成。结果表明:BT16钛合金在780℃渗氢的过程中发生了α+β相到β相的转变,冷却后生成了魏氏体组织,α相在不同通氢时间的试样中均存在,且含量随通氢时间的增加而降低,渗氢过程中出现了氢化物相。说明渗氢导致BT16钛合金α+β相到β相的临界转变温度降到800℃以下,氢含量影响了氢化物的存在形式,随着氢含量的增加,TiH相最先出现,随后出现TiH1.5和TiH2相,这些钛氢化合物均为针状。
In order to understand the effect of hydrogen permeation on the microstructure of BT16 titanium alloy and to obtain the microstructure with excellent cold heading property, the microstructure of BT16 titanium alloy was studied by means of optical microscopy (OM) and X-ray diffraction (XRD) The microstructure and phase composition. The results show that the transformation of α + β phase to β phase occurs during the hydrogen permeation at 780 ℃ in BT16 titanium alloy. After cooling, the microstructure of WTC is formed. The α phase exists in the samples with different hydrogen permeation times The content decreased with the increase of hydrogen passage time, and the hydride phase appeared during the hydrogen permeation. The result shows that the critical transition temperature of α + β phase to β phase of BT16 titanium alloy decreases to less than 800 ℃ after hydrogen permeation, and the hydrogen content affects the existing form of hydride. TiH phase first appears with the increase of hydrogen content, and then TiH1 .5 and TiH2 phases, these titanium hydride compounds are acicular.