CAJ | 학술논문

在室温下对铸态TiAl合金和冷轧TA15合金进行高密度脉冲电流处理.应用光学金相显微镜和透射电子显微镜研究脉冲电流处理前、后试样的显微组织.实验结果表明:通过脉冲电流处理可以细化铸态TiAl基合金的晶粒,从约l 000 μm的原始粗大层片组织,经脉冲电流处理后可以得到尺寸为30-50 μm细小、均匀的晶粒.对于冷轧TA15合金,脉冲电流处理后发生了完全的再结晶,晶粒组织由原始的α板条晶粒转变为细小的α等轴晶粒.研究结果表明,脉冲电流处理是一种有效的细化晶粒方法;由于不需要热机处理所要求的挤压等变形工序和高温加热、真粉保护等条件,简化了工艺过程.
재실온하대주태TiAl합금화랭알TA15합금진행고밀도맥충전류처리.응용광학금상현미경화투사전자현미경연구맥충전류처리전、후시양적현미조직.실험결과표명:통과맥충전류처리가이세화주태TiAl기합금적정립,종약l 000 μm적원시조대층편조직,경맥충전류처리후가이득도척촌위30-50 μm세소、균균적정립.대우랭알TA15합금,맥충전류처리후발생료완전적재결정,정립조직유원시적α판조정립전변위세소적α등축정립.연구결과표명,맥충전류처리시일충유효적세화정립방법;유우불수요열궤처리소요구적제압등변형공서화고온가열、진분보호등조건,간화료공예과정.
The specimens cut from as-cast TiAl alloy and cold-rolled TA15 sheet were treated by high density electropulsing.The optical microscope (OM) and transmission electron microscope (TEM) were used to examine the changes of the microstructure before and after the electropulsing.It is found that fine and homogeneous microstructures with the grain size of 30-50 μm can be obtained from the as-cast TiAl based alloy with the initial lamellae of about 1 000 μm.The electropulsing treatment can induce the completed recrystallization in cold-rolled TA15 sheet.After electropulsing treatment,the microstructure of TAl5 sheet transformed from primary α laths grain to smaller α equiaxed grain.The research results show that the electropulsing treatment is an effective method to refine grain of as-cast TiAl alloy and cold-rolled titanium alloys sheet.Because the conventional thermo-mechanical processing such as forging or extrusion or rolling as well as heating are not required,the refining process by electrropulsing is simpler than conventional ones.