A titanium alloy (Ti64) has α + β crystal orientations, and the β phase mainly appears in the SLM process since Ti64 melts above 1600 °C by laser irradiation and then solidifies. In order to control the crystal orientation and crystal grain size, the modulated pulse of laser was employed to control the heat input energy of laser in the SLM process in this study. After fabrication, the sample was cut to measure the Vickers hardness which was compared with that of the commercial Ti and Ti64; the continuous wave (CW) laser fabricated sample had a value close to that of pure Ti, and the fabricated sample using modulated pulse of laser had a value close to Ti64. It was considered that a phase was formed by using a CW laser and the α + β phase was formed by using modulated pulse of laser, suggesting the possibility of controlling the material structure by controlling the heat input of one layer which was formed by these processes.

中文翻译：

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通过调制脉冲进行无溅射选择性激光熔化，输入能量对Ti64硬度和表面质量的影响

钛合金（Ti64）具有α+β晶体取向，并且由于在激光照射下Ti64在1600°C以上熔化，因此β相主要出现在SLM过程中。为了控制晶体取向和晶粒尺寸，在本研究中，采用激光调制脉冲来控制SLM工艺中激光的热输入能量。制造后，将样品切割以测量维氏硬度，并将其与市售的Ti和Ti64进行比较；连续波（CW）激光制备的样品的值接近纯Ti的值，而使用激光调制脉冲制备的样品的值接近Ti64。认为通过使用连续波激光形成了相，并且通过使用激光的调制脉冲形成了α+β相，