Kurdi Abdulaziz, Aldoshan Abdelhakim, Alshabouna Fahad, Alodadi Abdulaziz, Degnah Ahmed, Alnaser Husain, Tabbakh Thamer, Basak Animesh Kumar
The Center of Excellence for Advanced Materials and Manufacturing, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia.
Advanced Manufacturing Technology Institute, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia.
Materials (Basel). 2023 Mar 16;16(6):2383. doi: 10.3390/ma16062383.
Additive manufacturing (AM) of Ni-based super alloys is more challenging, compared to the production other metallic alloys. This is due to their high melting point and excellent high temperature resistance. In the present work, an Inconel 718 alloy was fabricated by a powder laser bed fusion (P-LBF) process and investigated to assess its microstructural evolution, together with mechanical properties. Additionally, the alloy was compared against the cast (and forged) alloy of similar composition. The microstructure of the P-LBF-processed alloy shows hierarchy microstructure that consists of cellular sub-structure (~100-600 nm), together with melt pool and grain boundaries, in contrast of the twin infested larger grain microstructure of the cast alloy. However, the effect of such unique microstructure on mechanical properties of the L-PBF alloy was overwritten, due to the absence of precipitates. The hardness of the L-PBF-processed alloy (330-349 MPa) was lower than that of cast alloy (408 MPa). The similar trend was also observed in other mechanical properties, such as Young's modulus, resistance to plasticity and shear stress.
与其他金属合金的生产相比，镍基高温合金的增材制造（AM）更具挑战性。这是由于它们的高熔点和出色的耐高温性。在本工作中，通过粉末激光选区熔化（P-LBF）工艺制备了一种Inconel 718合金，并对其微观结构演变以及力学性能进行了研究。此外，还将该合金与具有相似成分的铸造（和锻造）合金进行了比较。与铸造合金中存在孪晶的较大晶粒微观结构不同，P-LBF工艺制备的合金微观结构呈现出由胞状亚结构（约100-600纳米）以及熔池和晶界组成的层级微观结构。然而，由于没有析出相，这种独特微观结构对L-PBF合金力学性能的影响被掩盖了。L-PBF工艺制备的合金硬度（330-349兆帕）低于铸造合金（408兆帕）。在其他力学性能方面，如杨氏模量、抗塑性和剪切应力，也观察到了类似的趋势。
