电子束高频扫描对TC4钛合金组织性能影响的研究

TC4 titanium alloy microstructure and properties influenced by high frequency scan of electron beam

摘要:

为了提高TC4钛合金表面硬度和微观组织,采用高频电子束扫描对TC4钛合金表面进行处理。为了获得良好的电子束高频扫描工艺参数,分别研究了电子束能量、聚焦电流、扫描频率等工艺参数调整时,TC4钛合金表面硬度和微观组织变化。将经过不同工艺处理的TC4钛合金,分别检测了表面硬度、表面组织、硬化层深度、硬化层内部组织。研究结果表明：与未经处理的TC4母材相比,经过电子束高频扫描处理的TC4钛合金表面硬度增加了40Mpa以上；随着电子束能量增加,影响深度将会增大；聚焦电流在小范围内调整,将会获得较高的表面硬度；处理区域的表面硬度逐渐减小,晶粒增大；其它工艺参数不变时,随着扫描次数增大,表面硬度逐渐降低,影响层的晶粒将会逐渐粗化。

Abstract:

In order to improve the HV hardness and microstructure on the surface of TC4 titanium alloy, the high frequency scan of electron beam had been introduced to treat TC4 titanium alloy. For acquiring excellent parameters, the energy of EB, focus current and scan times, which will influence the HV hardness and microstructres, had been studied respectively. After high frequency scan of electron beam treatment, the HV hardness, modified layer depth and microstructures of TC4 titanium alloy had been analyzed respectively. It is shown that the HV hardness on the TC4 surface treated by the high frequency scan of electron beam can be increased almost 40Mpa than original material. With energy of EB improved, the depth layer influenced is increased. The focus current adjusted at little range can acquire comparatively better HV hardness on the surface. When the scan times are increased, not only the HV hardness decreases, but also the grains grow up.