Article
Materials Science, Multidisciplinary
Heesoo Choi, Sumin Kim, Masahiro Goto, Sangshik Kim
Summary: In this study, Inconel 718 specimens were produced using the L-PBF process with both virgin and recycled powder to investigate the impact of powder recycling on damage tolerability. It was observed that the K-Q value slightly decreased under recycled powder conditions.
MATERIALS CHARACTERIZATION
(2021)
Article
Engineering, Manufacturing
Minglin He, Hailin Cao, Qian Liu, Jiang Yi, Yong Ni, Shuai Wang
Summary: In this study, the development of dislocation cellular pattern (DCP) in laser-based additively manufactured metals was systematically investigated using tensile tests and multiscale characterization methods. It was found that DCP differs from conventional dislocation cells as it is composed of solute atoms and small precipitates. The development of DCP was independent of crystal orientation and can be divided into two stages, with the DCP size being unaffected by stress at low strains and decreasing at higher strains with a maximum reduction of only ~27%. The dislocation density at DCP boundaries increased with increasing strain.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Xiang Wang, Jiwu Wang, Jinwu Kang, Tianjiao Wang, Pengyue Wu, Tao Feng, Lele Zheng, Yiming Rong
Summary: Additive manufacturing allows for high throughput investigation of material preparation and processing, with a focus on the effect of key parameters on soundness, microstructure and mechanical properties of fabricated parts. The study found that high laser power has a more significant impact on specimen quality than scanning speed, and that high power and slow speed can help achieve low porosity in specimens. A processing chart for guidance in L-PBF was obtained.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Y. C. Wang, L. Y. Wang, B. Zhang, Z. M. Song, X. M. Luo, G. P. Zhang
Summary: This study investigates the building height-dependent creep properties and microstructures of laser powder bed fusion-fabricated Inconel 718 superalloy. The results reveal significant differences in recrystallization degree among specimens taken from different building heights due to variations in dislocation density and texture intensity along the building direction. The bottom specimen exhibits the highest recrystallization degree and longest creep life, attributed to lower dislocation density, higher Taylor factor, and lower grain boundary volume fraction.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Bo Du, Qian Liu, Minglin He, Jiang Yi, Jing He, Shuai Wang
Summary: In this study, the microstructure characteristics of Inconel 718 tiny pillars fabricated using laser powder bed fusion were analyzed. The results revealed a microscale heterogeneous microstructure with varying substructure sizes, arrangements of precipitates, dislocation structures, and segregation of solute atoms. The pillar center displayed a polygonal substructure without precipitates, which is different from the typical microstructure in bulk Inconel 718 alloys. Nanoindentation and micropillar compression tests showed that the transition zone had higher hardness and yield stress compared to the center and edge of the pillar. The edge and center region exhibited similar mechanical responses.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Yaojie Wen, Jianbao Gao, Ramasubramanian Lakshmi Narayan, Pei Wang, Lijun Zhang, Baicheng Zhang, Upadrasta Ramamurty, Xuanhui Qu
Summary: The microstructures and mechanical properties of a laser powder bed fusion manufactured compositionally graded alloy of SS316L and Inconel 718 were studied. Heat treatment caused changes in the microstructure and mechanical properties of the alloy, including coarsening of Laves phases and precipitation of gamma and gamma' phases. The alloy exhibited increased hardness, yield strength, and tensile strength but decreased ductility after heat treatment.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Linqing Liu, Di Wang, Yongqiang Yang, Zhi Wang, Zeyu Qian, Shibiao Wu, Jinrong Tang, Changjun Han, Chaolin Tan
Summary: The scanning strategy plays a crucial role in determining the thermal history and melt track combination in the LPBF process. Different scanning strategies result in varied morphologies of melt tracks and grain growth, leading to differences in the microstructure and mechanical properties of parts. The Rot-scan strategy shows the most promising results in improving part density. The ultimate tensile strength of samples manufactured by Y-scan, XY-scan, and Rot-scan is comparable to wrought material, while their ductility is higher. However, parts manufactured by island scanning exhibit the lowest tensile properties due to defects at the overlap of islands.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Minglin He, Ziting Xiang, Jiang Yi, Yong Ni, Shuai Wang
Summary: The dislocation cellular pattern (DCP) has a significant impact on the mechanical properties of metals fabricated by laser powder bed fusion. Through the investigation of Inconel 718 alloy and pure Ni, it is found that the generation mechanisms and morphologies of DCP are influenced by thermal stress and solute atoms.
Article
Engineering, Manufacturing
Yaojie Wen, Baicheng Zhang, Ramasubramanian Lakshmi Narayan, Pei Wang, Xu Song, Hao Zhao, Upadrasta Ramamurty, Xuanhui Qu
Summary: A novel method for LPBF of large-scale compositionally graded alloy components was devised and demonstrated in this study, showing defect-free samples with smooth end-to-end variations in composition and microstructures. This method has the potential to be extended to other material combinations for creating high quality CGA components.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Shahir Mohd Yusuf, Xiao Zhao, Shoufeng Yang, Nong Gao
Summary: This study investigates the interfacial region of multi-material 316L stainless steel/Inconel 718 fabricated by laser powder bed fusion (L-PBF) for the first time, demonstrating solid metallurgical bonding with average microhardness measurements of 265 HV, 304 HV, and 223 HV at different regions.
Article
Materials Science, Multidisciplinary
Jiun-Ren Hwang, Jing-Yuan Zheng, Po-Chen Kuo, Chou-Dian Huang, Chin-Ping Fung
Summary: This study optimized the manufacturing parameters of LPBF casting Inconel 718 alloy using the Taguchi method and principal component analysis, finding that the optimal combination can achieve the highest tensile strength, with the interlayer angle being the most important control factor.
Article
Materials Science, Multidisciplinary
Qiao Zhong, Kaiwen Wei, Taoyuan Ouyang, Xiangyou Li, Xiaoyan Zeng
Summary: The study investigates the effects of rotation angles on the surface morphology, microstructure, and mechanical properties of Inconel 718 alloy produced by high-power laser powder bed fusion (HP-LPBF). Low rotation angles result in poor surface finish and lack-of-fusion defects, while high rotation angles lead to smaller surface roughness and better relative density. There are noticeable edge effects and a downward trend in maximal heights with increased rotation angle. The tensile property is slightly enhanced with increasing rotation angle.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Review
Materials Science, Multidisciplinary
Esmaeil Sadeghi, Paria Karimi, Reza Esmaeilizadeh, Filippo Berto, Shuai Shao, Johan Moverare, Ehsan Toyserkani, Nima Shamsaei
Summary: This paper comprehensively reviews the fundamentals and recent advances in the PBF-built Alloy 718 parts with improved fatigue life, including the influence of thermal and mechanical post-treatment, mechanisms of fatigue crack initiation and growth, thermo-mechanical fatigue, dwell-time fatigue, as well as fracture behavior in different loading conditions and environments considering anisotropic characteristics of the material. An unbiased review of the literature provides an understanding of the advanced and outstanding achievements in the field that assure further research. An evaluation of the status of the field, the gaps in the theoretical understanding, and the fundamental needs for the sustainable development of PBF-built Alloy 718 with enhanced fatigue life in specific applications are also provided.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Bharath Bhushan Ravichander, Kiriti Mamidi, Vignesh Rajendran, Behzad Farhang, Aditya Ganesh-Ram, Manjunath Hanumantha, Narges Shayesteh Moghaddam, Amirhesam Amerinatanzi
Summary: Inconel 718 (IN718) is a nickel-based superalloy known for its excellent mechanical and high-temperature corrosion properties, but its low machinability due to high toughness and work hardening. Selective laser melting (SLM) process has been adopted to fabricate IN718 parts efficiently. Different scan strategies in SLM process directly influence residual stresses, microstructure, and mechanical properties.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Yunhao Zhao, Fan Meng, Chuan Liu, Susheng Tan, Wei Xiong
Summary: It has been found that conducting a higher temperature homogenization process on Inconel 718 alloys can effectively remove residual stress and introduce isotropic microstructures and tensile properties, crucial for engineering applications. This method also improves the isotropic precipitation of strengthening phases during subsequent aging processes, aiding in the development of effective post-heat treatments for additively manufactured alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
