Effect of process atmosphere on microstructure, melt pool, texture, precipitate characteristics, and mechanical properties of laser powder bed fusion Fe-12Cr-6Al

IF 4.2 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters Pub Date : 2024-05-01 DOI:10.1016/j.addlet.2024.100219

Omer Cakmak , Seong Gyu Chung , Seung-Hoon Lee , JiHoe Koo , Hwasung Yeom , Jung-Wook Cho

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Abstract

This study investigates the impact of atmospheres (Ar and N₂) on Fe-12Cr-6Al alloy fabricated using laser powder bed fusion (L-PBF) in terms of melt pool shape/size, microstructure, precipitate characteristics, and mechanical properties. The sample built in the N₂ atmosphere exhibited lower porosity, wider melt pools, and no Al₂O₃ agglomeration. Oxygen content decreased from 0.012 to 0.0045 (wt.%), and nitrogen content increased from 0.013 to 0.02 (wt.%). The Ar-printed sample had a yield strength (YS) of 232 ± 15 MPa, ultimate tensile strength (UTS) of 286 ± 10 MPa, and total elongation (TE) of 6.4 ± 1.3 %, while the N₂-printed sample showed significant improvements of the mechanical properties: YS of 315 ± 11 MPa, UTS of 401 ± 11 MPa, and TE of 7.8 ± 1.1 %. Therefore, N₂ might be considered to replace Ar as a cost-effective shielding gas for FeCrAl alloys, with improved properties.

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工艺气氛对激光粉末床熔融 Fe-12Cr-6Al 的微观结构、熔池、纹理、析出物特征和力学性能的影响

本研究从熔池形状/大小、微观结构、沉淀物特征和机械性能等方面，探讨了气氛（Ar 和 N2）对使用激光粉末床熔化（L-PBF）制造的 Fe-12Cr-6Al 合金的影响。在 N2 气氛中制造的样品孔隙率较低，熔池较宽，没有 Al2O3 凝聚。氧含量从 0.012 降至 0.0045（重量百分比），氮含量从 0.013 增至 0.02（重量百分比）。氩印刷样品的屈服强度（YS）为 232 ± 15 兆帕（兆帕），极限拉伸强度（UTS）为 286 ± 10 兆帕（兆帕），总伸长率（TE）为 6.4 ± 1.3 %：YS 为 315 ± 11 MPa，UTS 为 401 ± 11 MPa，TE 为 7.8 ± 1.1 %。因此，可以考虑用 N2 替代 Ar，作为铁铬铝合金的一种经济有效的屏蔽气体，并改善其性能。

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