CAJ | 학술논문

采用累计流量法对供应态Ti-6Al-4V合金进行了固态置氢,运用OM、XRD、TEM分析等方法研究了Ti-6Al-4V合金固态置氢后的微观组织状态及演变过程.结果表明:供应态Ti-6Al-4V合金的置氢量低于0.30%(质量分数,下同)时,置氢使得Ti-6Al-4V合金中的α相减少、β相增加;置氢量达到0.30%时,置氢Ti-6Al-4V合金中有δ氢化物(TiH_2相)形成;β-Ti(H)共析转变生成α-Ti和δ氢化物时主要以切变方式进行;置氢Ti-6Al-4V合金的相变温度最多下降了180 °C,与Ti-6Al-4V合金在置氢过程中的相体积比变化和共析转变有密切关系.
채용루계류량법대공응태Ti-6Al-4V합금진행료고태치경,운용OM、XRD、TEM분석등방법연구료Ti-6Al-4V합금고태치경후적미관조직상태급연변과정.결과표명:공응태Ti-6Al-4V합금적치경량저우0.30%(질량분수,하동)시,치경사득Ti-6Al-4V합금중적α상감소、β상증가;치경량체도0.30%시,치경Ti-6Al-4V합금중유δ경화물(TiH_2상)형성;β-Ti(H)공석전변생성α-Ti화δ경화물시주요이절변방식진행;치경Ti-6Al-4V합금적상변온도최다하강료180 °C,여Ti-6Al-4V합금재치경과정중적상체적비변화화공석전변유밀절관계.
Hydrogenation of Ti-6Al-4V titanium alloys was carried out in a special furnace through the accumulated flux method, and OM, XRD and TEM techniques were used to investigate the microstructure evolution of the hydrogenated Ti-6Al-4V titanium alloy. The hydrogenation of the Ti-6Al-4V titanium alloy with the hydrogen content of 0.30 wt% makes the α phase fraction decrease compared with that of the as-received Ti-6Al-4V titanium alloy, but it makes the β phase fraction increase. The δ hydride (TiH_2 phase) occurs in the hydrogenated Ti-6Al-4V titanium alloy when the hydrogen content is more than 0.3 wt%. The shear deformation is main pattern in the transformation processes from β-Ti(H) phase to α-Ti phase and δ hydride (TiH_2 phase). The phase transformation temperature of the hydrogenated Ti-6Al-4V titanium alloy decreases by 180 °C compared with that of the as-received Ti-6Al-4V titanium alloy, and it is related to the phase fraction and phase transformation.