Real-time monitoring of laser powder bed fusion process using high-speed X-ray imaging and diffraction.
Real-time monitoring of laser powder bed fusion process using high-speed X-ray imaging and diffraction.
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DOI：
10.1038/s41598-017-03761-2
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发表时间：
2017-06-15
影响因子：
4.6
通讯作者：
Sun T
中科院分区：
文献类型：
--
作者：
Zhao C;Fezzaa K;Cunningham RW;Wen H;De Carlo F;Chen L;Rollett AD;Sun T
采用高速同步辐射硬X射线成像和衍射技术对Ti-6Al-4V激光粉末床熔合过程进行了真实的实时监测。我们证明，许多科学和技术上的重要现象，包括熔池动力学，粉末喷射，快速凝固和相变，LPBF，可以探测到前所未有的空间和时间分辨率。特别是，锁孔孔的形成实验揭示了高的空间和时间分辨率。定量测量了凝固速率，凝固速率在相对稳定状态下缓慢下降可能是吸热现象的表现。高速衍射使冷却速率和相变速率得到合理估计，β相向α '相的无扩散转变明显。本文所提供的数据将有助于理解金属LPBF过程中的动力学和动力学，所建立的实验平台无疑将成为未来金属增材制造研究和发展的新范式。
We employ the high-speed synchrotron hard X-ray imaging and diffraction techniques to monitor the laser powder bed fusion (LPBF) process of Ti-6Al-4V in situ and in real time. We demonstrate that many scientifically and technologically significant phenomena in LPBF, including melt pool dynamics, powder ejection, rapid solidification, and phase transformation, can be probed with unprecedented spatial and temporal resolutions. In particular, the keyhole pore formation is experimentally revealed with high spatial and temporal resolutions. The solidification rate is quantitatively measured, and the slowly decrease in solidification rate during the relatively steady state could be a manifestation of the recalescence phenomenon. The high-speed diffraction enables a reasonable estimation of the cooling rate and phase transformation rate, and the diffusionless transformation from β to α ’ phase is evident. The data present here will facilitate the understanding of dynamics and kinetics in metal LPBF process, and the experiment platform established will undoubtedly become a new paradigm for future research and development of metal additive manufacturing.