Effect of Scanning Strategies on the Microstructure and Mechanical Properties of Inconel 718 Alloy Fabricated by Laser Powder Bed Fusion

The scanning strategy is an essential factor that determines the thermal history and combination of melt tracks within parts in the laser powder bed fusion (LPBF) process, which can significantly influence the microstructure evolution, defect formation, and mechanical properties of parts. Herein, the effect of scanning strategies (i.e., Y‐scan, XY‐scan, Rot‐scan, and Island‐scan) on the microstructure and mechanical properties of Inconel 718 (IN718) parts manufactured by LPBF is investigated. The results show that different scanning strategies can lead to different morphologies of melt tracks, and the Rot‐scan is the most beneficial strategy for improving density of parts. Different scanning strategies change the direction of the temperature gradient within parts, resulting in different morphologies of grain growth. The tensile properties of samples built with four types of scanning strategies show superior mechanical properties compared with the cast. The ultimate tensile strength of samples manufactured by Y‐scan, XY‐scan, and Rot‐scan is equivalent to that of the wrought, while the ductility of them is higher than that of wrought. However, tensile properties of samples manufactured by island scanning are lowest due to defects (e.g., pores, spatters) at the overlap of islands.

[1]  A. Amerinatanzi,et al.  Experimental investigation of laser scan strategy on the microstructure and properties of Inconel 718 parts fabricated by laser powder bed fusion , 2022, Materials Characterization.

[2]  Guichuan Li,et al.  Understanding the effect of scanning strategies on the microstructure and crystallographic texture of Ti-6Al-4V alloy manufactured by laser powder bed fusion , 2022, Journal of Materials Processing Technology.

[3]  Q. Semeraro,et al.  Fast optimisation procedure for the selection of L-PBF parameters based on utility function , 2021, Virtual and Physical Prototyping.

[4]  Suh In Kim,et al.  A spiral laser scanning routine for powder bed fusion inspired by natural predator-prey behaviour , 2021, Virtual and Physical Prototyping.

[5]  G. Requena,et al.  The effect of build direction and geometric optimization in laser powder bed fusion of Inconel 718 structures with internal channels , 2021 .

[6]  Guijun Bi,et al.  Progress and perspectives in laser additive manufacturing of key aeroengine materials , 2021, International Journal of Machine Tools and Manufacture.

[7]  A. Borgenstam,et al.  Influence of solidification structure on austenite to martensite transformation in additively manufactured hot-work tool steels , 2021, Acta materialia.

[8]  Yuanxin Luo,et al.  High‐Temperature Mechanical Behavior Assessment based on a Developed Constitutive Model of Inconel 718 Fabricated by Selective Laser Melting , 2021, Advanced Engineering Materials.

[9]  T. Ishimoto,et al.  Unique crystallographic texture formation in Inconel 718 by laser powder bed fusion and its effect on mechanical anisotropy , 2021 .

[10]  Yi Wu,et al.  Scanning strategy in selective laser melting (SLM): a review , 2021, The International Journal of Advanced Manufacturing Technology.

[11]  Joel Heang Kuan Tan,et al.  Resolving the porosity-unmelted inclusion dilemma during in-situ alloying of Ti34Nb via laser powder bed fusion , 2021 .

[12]  Wenqian Guo,et al.  Study on the junction zone of NiTi shape memory alloy produced by selective laser melting via a stripe scanning strategy , 2020 .

[13]  Zemin Wang,et al.  Isothermal Solid‐State Transformations of Inconel 718 Alloy Fabricated by Selective Laser Melting , 2020, Advanced Engineering Materials.

[14]  Xiebin Wang,et al.  Effect of scanning strategies on the microstructure and mechanical behavior of 316L stainless steel fabricated by selective laser melting , 2020 .

[15]  Tait D. McLouth,et al.  Variations in ambient and elevated temperature mechanical behavior of IN718 manufactured by selective laser melting via process parameter control , 2020 .

[16]  C. Körner,et al.  Fabrication of Single Crystals through a µ-Helix Grain Selection Process during Electron Beam Metal Additive Manufacturing , 2020, Metals.

[17]  V. Popovich,et al.  A review of mechanical properties of additively manufactured Inconel 718 , 2019 .

[18]  Gang Xu,et al.  Effect of scanning strategy on microstructure and mechanical properties of selective laser melted reduced activation ferritic/martensitic steel , 2019, Materials Science and Engineering: A.

[19]  H. Wan,et al.  Effect of scanning strategy on mechanical properties of selective laser melted Inconel 718 , 2019, Materials Science and Engineering: A.

[20]  F. Calignano,et al.  Texture and Microstructural Features at Different Length Scales in Inconel 718 Produced by Selective Laser Melting , 2019, Materials.

[21]  Zhiheng Hu,et al.  A comparative study on single-laser and multi-laser selective laser melting AlSi10Mg: defects, microstructure and mechanical properties , 2019, Materials Science and Engineering: A.

[22]  G. Zhu,et al.  Role of scanning strategy on residual stress distribution in Ti-6Al-4V alloy prepared by selective laser melting , 2018, Optik.

[23]  H. Wan,et al.  Effect of scanning strategy on grain structure and crystallographic texture of Inconel 718 processed by selective laser melting , 2018, Journal of Materials Science & Technology.

[24]  Chang Li,et al.  Enhancing Fatigue Strength of Selective Laser Melting‐Fabricated Inconel 718 by Tailoring Heat Treatment Route , 2018, Advanced Engineering Materials.

[25]  Chee Kai Chua,et al.  Simultaneously enhanced strength and ductility for 3D-printed stainless steel 316L by selective laser melting , 2018, NPG Asia Materials.

[26]  Yuebin Guo,et al.  On the Simulation Scalability of Predicting Residual Stress and Distortion in Selective Laser Melting , 2018 .

[27]  K. Hagihara,et al.  Effect of scanning strategy on texture formation in Ni-25 at.%Mo alloys fabricated by selective laser melting , 2018 .

[28]  K. Chou,et al.  Effects of thermal cycles on the microstructure evolution of Inconel 718 during selective laser melting process , 2017 .

[29]  A. Kromm,et al.  Effect of hatch length on the development of microstructure, texture and residual stresses in selective laser melted superalloy Inconel 718 , 2017 .

[30]  Rui-di Li,et al.  Anisotropic tensile behavior of in situ precipitation strengthened Inconel 718 fabricated by additive manufacturing , 2017 .

[31]  L. Levine,et al.  Homogenization Kinetics of a Nickel-based Superalloy Produced by Powder Bed Fusion Laser Sintering. , 2017, Scripta materialia.

[32]  E. V. Borisov,et al.  Functionally graded Inconel 718 processed by additive manufacturing: Crystallographic texture, anisotropy of microstructure and mechanical properties , 2017 .

[33]  Konda Gokuldoss Prashanth,et al.  Simultaneous enhancements of strength and toughness in an Al-12Si alloy synthesized using selective laser melting , 2016 .

[34]  Yong-qiang Yang,et al.  Investigation of crystal growth mechanism during selective laser melting and mechanical property characterization of 316L stainless steel parts , 2016 .

[35]  Wu Songquan,et al.  Study on the microstructure, mechanical property and residual stress of SLM Inconel-718 alloy manufactured by differing island scanning strategy , 2015 .

[36]  U. Glatzel,et al.  Mechanical and Microstructural Investigation of Nickel‐Based Superalloy IN718 Manufactured by Selective Laser Melting (SLM) , 2015 .

[37]  Yusheng Shi,et al.  Differences in microstructure and properties between selective laser melting and traditional manufacturing for fabrication of metal parts: A review , 2015, Frontiers of Mechanical Engineering.

[38]  Yanjin Lu,et al.  Investigation on the microstructure, mechanical property and corrosion behavior of the selective laser melted CoCrW alloy for dental application. , 2015, Materials science & engineering. C, Materials for biological applications.

[39]  J. Kruth,et al.  Strong morphological and crystallographic texture and resulting yield strength anisotropy in selective laser melted tantalum , 2013 .

[40]  J. Kruth,et al.  Fine-structured aluminium products with controllable texture by selective laser melting of pre-alloyed AlSi10Mg powder , 2013 .

[41]  Yong-qiang Yang,et al.  Research on track overlapping during Selective Laser Melting of powders , 2012 .

[42]  Weidong Huang,et al.  The effect of laser scanning path on microstructures and mechanical properties of laser solid formed nickel-base superalloy Inconel 718 , 2011 .

[43]  W. Godfrey,et al.  Process , 1965, Encyclopedic Dictionary of Archaeology.

[44]  N. Saintier,et al.  Effect of laser scan pattern in laser powder bed fusion process: The case of 316L stainless steel , 2022, Procedia Structural Integrity.

[45]  J. Nellesen,et al.  Hot isostatic pressing of IN718 components manufactured by selective laser melting , 2017 .

[46]  J. Kruth,et al.  Mechanical Properties of AlSi10Mg Produced by Selective Laser Melting , 2012 .