基板预热、重熔、预烧结对激光选区熔化Ti-47Al-2Cr-2Nb裂纹形成的影响

Effect of Substrate Preheating, Remelting, In-situ Presintering on Crack Formation of Ti-47Al-2Cr-2Nb Fabricated by Selective Laser Melting

摘要:

为了抑制激光选区熔化（SLM）制备Ti-47Al-2Cr-2Nb合金时裂纹的形成，研究了基板预热、重熔和预烧结等方法对裂纹形成和表面质量的影响。结果表明，基板预热、重熔和预烧结可以在一定程度上减少裂纹的形成，致密度提高了1.71%~4.34%；重熔有助于改善表面质量，但会明显降低生产效率；另外，基板预热与预烧结相结合，能更有效地防止裂纹的产生，致密度超过99%。

Abstract:

The methods of substrate preheating, remelting and in-situ presintering were proposed to fabricate Ti-47Al-2Cr-2Nb by selective laser melting (SLM). The effects of these approaches on the formation of cracks and surface quality were investigated. The results indicate that substrate preheating, remelting and in-situ presintering powder can reduce the formation of cracks to a certain extent, and the density is increased by 1.71%~4.34%. Remelting contributes to improvement of the surface quality but greatly reduces the productivity. In addition, the combination of substrate preheating and in-situ presintering can effectively prevent the occurrence of cracks, and the density is over 99%.