Article
Materials Science, Multidisciplinary
Sumit K. Sharma, K. Biswas, J. Dutta Majumdar
Summary: This study aims to investigate the microstructure, residual stress, and microhardness of electron beam surface remelted Inconel 718 alloy. The study found that surface remelting leads to significant microstructural refinement and improvement in hardness, and optimizing process parameters can further enhance performance.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Thermodynamics
Yuewei Ai, Yachao Yan, Guangyu Dong, Shibo Han
Summary: A macro-micro coupling model is developed to investigate the microstructure evolution of Inconel 718 superalloy during circular shaped oscillating laser welding. The macro-scale heat transfer model is used to obtain the temperature distribution in the molten pool, while the micro-scale phase field model explores the microstructure evolution. The proposed model accurately predicts the microstructure and can provide optimal process conditions for improving welded joint quality in practical manufacturing.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Nanoscience & Nanotechnology
Jie Ding, S. Xue, Z. Shang, Jin Li, Y. Zhang, R. Su, T. Niu, H. Wang, X. Zhang
Summary: IN718 superalloy's mechanical properties are largely determined by precipitates, with the precipitation of high-density hexagonal eta phase observed in nanograined IN718 alloy after heat treatment. Compressive stress from severe plastic deformation may inhibit the formation of certain phases while accelerating the precipitation of others, affecting the overall mechanical behavior of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Houqin Wang, Yifan Wang, Haifeng Xiong, Xiaobing Wang, Mengchuan Guo, Binggang Zhang
Summary: Electron beam welding was used to prepare Inconel 718/Ni lap joints and study the influence of assembly gaps on weld formation and mechanical properties. The results showed that the presence of assembly gaps affected the connection effectiveness and shear strength, and the gap metal in the lap joint contributed to good sealing performance.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Ateekh Ur Rehman, Yusuf Usmani, Ali M. Al-Samhan, Saqib Anwar
Summary: Nickel-based superalloys demonstrate excellent high temperature performance, showing high tensile strength and good tensile ductility in room temperature tests. Joining two different nickel-based superalloys using rotary friction welding produced defect-free metallurgical joints.
Article
Materials Science, Multidisciplinary
G. K. Sujan, Azdiar A. Gazder, Edohamen Awannegbe, Huijun Li, Zengxi Pan, Daniel Liang, Nazmul Alam
Summary: The hybridization of additive manufacturing techniques with conventional forming processes can reduce production cost, time, and material wastage while producing near-net shaped components with refined microstructure and desired properties. The thermomechanical behavior and microstructural evolution of heat-treated wire-arc additively manufactured Inconel 718 parts were investigated, showing that the deformation behavior and microstructure were independent of sample orientation. The uniformity of the dynamically recrystallized microstructure was influenced by the orientation of columnar grains and processing parameters.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
R. Y. Zhang, H. L. Qin, Z. N. Bi, Y. T. Tang, J. Araujo de Oliveira, T. L. Lee, C. Panwisawas, S. Y. Zhang, J. Zhang, J. Li, H. B. Dong
Summary: In this study, the gamma '' variant distribution in Inconel 718 samples was tailored through ageing heat treatment, and the variant-sensitive deformation behavior was studied through in situ tensile tests using neutron diffraction. The results showed that the yield strength varied with different gamma '' variant distributions, which can be attributed to the interactions between dislocations and different gamma '' variants.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
K. Devendranath Ramkumar, A. Vishnu Arvind, K. V. Rama Aravinth, E. Srivatson, Supriyo Ganguly
Summary: In this study, Inconel 718 joints were fabricated using the PDCGTAW and LAHW techniques. A post-weld heat treatment was performed on the joints, and liquation cracking was observed in the HAZ of the LAHW joints. The microstructural characteristics of the joints varied with different treatment conditions.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Junlei Qi, Qitai Eri, Bo Kong, Yufeng Zhang
Summary: The study investigated the effects of oxidation at different temperatures and times on the radiative properties of Inconel 718 alloy, revealing that high-temperature oxidation can enhance the alloy's emissivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Optics
Alireza Mirak, Behrooz Shams, Soroush Bakhshi
Summary: In this research, the welding of Inconel 713 superalloy and high strength AISI 4140 steel using pulsed Nd:YAG laser was successfully carried out. The effect of heat input on the microstructural and mechanical properties of the weld was studied. It was found that the increase of heat input resulted in the formation of a coarse dendritic structure and a reduction in the hardness of the weld metal. The HAZ of the 4140 steel side showed the highest hardness due to the formation of martensitic microstructure, while the hardness in the HAZ of the Inconel 713 side remained relatively unchanged. The higher heat input led to the segregation of certain elements and the formation of brittle laves phase, which caused a decrease in the tensile strength of the weld. However, the weld joint exhibited the maximum tensile strength at a lower heat input.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Maria Moreno-Rubio, Jesus Vazquez, Carlos Navarro, Jaime Dominguez
Summary: This study investigates the behavior of fretting fatigue and compares it with plain fatigue under different conditions, including load levels and temperatures. The results show that there are differences in fracture surfaces and fatigue crack growth rates between the two types of fatigue under different testing conditions.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Automation & Control Systems
Akash Sali, Vivek Patel, James Hyder, David Hyder, Mike Corliss, Wayne Hung
Summary: This paper explores the feasibility of welding Inconel 718 (IN718) and compares the quality of electron beam welded samples produced by hot rolling and laser powder bed fusing (L-PBF). The results show that both the yield and tensile strength of the welded L-PBF materials exceeded those of rolled materials and met the minimum requirement from ASTM specification. However, the ductility of the welded L-PBF material did not.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Metallurgy & Metallurgical Engineering
Muralimohan Cheepu, Venkata Charan Kantumuchu
Summary: This study investigates the effect of heat input on microstructural growth in wire arc additive manufacturing. The experimental results demonstrate that low heat input leads to equiaxed grain formation, while high heat input results in columnar grains. The simulation results confirm this phenomenon.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
Article
Engineering, Mechanical
Xiaobin Yu, Xin Lin, Hua Tan, Yunlong Hu, Shuya Zhang, Fencheng Liu, Haiou Yang, Weidong Huang
Summary: This study demonstrates that different heat treatments on LDED IN718 can alter its microstructural characteristics and affect its FCG resistance. By carefully selecting heat treatment conditions, the FCG threshold of IN718 can be significantly increased, making it comparable to wrought IN718.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Green & Sustainable Science & Technology
Niraj Kumar, Prakash Kumar, Rajat Upadhyaya, Sanjeev Kumar, Chandan Panday
Summary: This study investigates the dissimilar autogenous laser beam welding between Inconel 718 and Austenitic Stainless Steel 304L. Microstructural analysis reveals the presence of laves phases in the weld zone, as well as heterogeneous microstructural formation. Optical images show mixed dendrites in the weld zone and fusion zones. Energy-dispersive spectroscopy results indicate the presence of segregated elements at the weld center. Mechanical testing demonstrates brittle failure in the impact test of the weld zone. Based on the microstructure and mechanical results, the LBW dissimilar weld between Inconel 718 and ASS 304L is qualified for safe use in high-temperature end applications.
Article
Chemistry, Physical
Aysen Akturk, Melek Erol Taygun, Funda Karbancioglu Guler, Gultekin Goller, Sadriye Kucukbayrak
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2019)
Article
Metallurgy & Metallurgical Engineering
Can Cekli, Gultekin Goller
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
(2019)
Article
Materials Science, Composites
Aysen Akturk, Melek Erol Taygun, Gultekin Goller
POLYMER COMPOSITES
(2020)
Article
Materials Science, Characterization & Testing
Hulya Kaftelen Odabasi, Akin Odabasi
Article
Metallurgy & Metallurgical Engineering
Baris Yavas, Gultekin Goller
Summary: In this study, ceramic-based layers were successfully formed on the surface of TZM by spark plasma sintering method, improving its oxidation resistance and dynamic flame test performance by about 70%. The highest hardness values at the surface layers were measured as 32.7 GPa and 13.8 GPa for B4C-Si and Al2O3 additions, respectively.
OXIDATION OF METALS
(2021)
Article
Materials Science, Ceramics
Dilan Bozkurt, Melis Kaplan Akarsu, Ipek Akin, Gultekin Goller
Summary: This study successfully produced Si3N4-based composites with good mechanical properties and bioactivity, investigating the effects of reinforcement type and content on the properties. Insight was gained into the densification behavior, phase analysis, microstructural development, mechanical properties, and in-vitro bioactivity behavior of the composites.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2021)
Article
Chemistry, Multidisciplinary
Aysen Akturk, Melek Erol-Taygun, Gultekin Goller, Sadriye Kucukbayrak
Summary: This study successfully fabricated PCL nanofiber membranes containing BG and Cu NPs, with 10% PCL concentration, 15% BG ratio, and 0.025% Cu NPs ratio determined to be biocompatible with L929 fibroblast cells. The membranes also exhibited osteogenic potential and angiogenic potential, indicating their potential for tissue engineering applications.
Article
Materials Science, Ceramics
Melis Kaplan Akarsu, Ipek Akin, Filiz Sahin, Gultekin Goller
Summary: The influence of two different SPS-based processing routes on the properties of TaB2-TaC composites was investigated. The reactive SPS method resulted in better densification and higher hardness compared to nonreactive SPS, with smaller grain size. However, no significant difference was observed in the oxidation behavior of the composites produced by the two methods.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Erdem Balci, Baris Yavas, Gultekin Goller
Summary: In this study, monolithic B4C, B4C-CNT, B4C-GNP, and B4C-CNT-GNP composites were prepared by ultrasonic stirring method and spark plasma sintering (SPS) technique. The addition of graphene nanoplatelets (GNPs) led to enhanced densification behavior and mechanical properties in B4C-CNT composites. Furthermore, the incorporation of GNPs improved fracture toughness by bridging cracks and changing crack propagation.
JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Ipek Akin, Burak Cagri Ocak, Melis Kaplan Akarsu, Onuralp Yucel, Filiz Sahin, Gultekin Goller
Summary: The study investigated the effect of GNP concentration on the mechanical properties of spark plasma sintered TiB2 and NbB2 ceramics, finding that GNPs enhance densification while also affecting microhardness. NbB2-GNP composites exhibited higher fracture toughness and better oxidation resistance compared to TiB2-GNP composites.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Ceramics
Burak Cagri Ocak, Gultekin Goller
Summary: Monolithic B4C and B4C-based ceramics incorporating FeNiCoCrMo dual-phase high entropy alloys (HEAs) were produced by spark plasma sintering (SPS) in this study. The addition of HEAs enhanced the densification behavior and increased the hardness and fracture toughness values of the samples. The highest density and the best mechanical properties were achieved with 2.00 vol.% HEA addition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Ayberk Cetinbag, Ozden Ormanci, Gultekin Goller
Summary: TZM alloy is an important Mo-based alloy for high temperature applications, but its low oxidation resistance limits its use. In this study, B4C reinforced TZM alloy was produced and borided in one step using spark plasma sintering, improving its oxidation resistance.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Coatings & Films
Fatih Kirbiyik, Mustafa Guven Gok, Gultekin Goller
Summary: Investigation of a new type of functionally graded thermal barrier coating for resistance to high-temperature corrosion, using two different test setups to simulate harsh engine environments. Compared to commercial single-layer coatings, the new coating did not undergo phase transformation, while the commercial coating experienced phase transformation after high-temperature testing, resulting in coating failure.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Physical
Filiz Cinar Sahin, Mubashir Mansoor, Meral Cengiz, Burcu Apak, Leyla Yanmaz, Katalin Balazsi, Zsolt Fogarassy, Bora Derin, Gultekin Goller, Onuralp Yucel
Summary: Square-shaped boron carbide ceramic composites have been produced by spark plasma sintering with the addition of titanium metal powder, resulting in enhanced properties of B4C due to in situ self-propagating high-temperature synthesis (SHS) of TiB2. The addition of Ti reduces the required sintering temperature and pressure and transforms into TiB2, forming a core-shell microstructure.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Camelia Tecu, Iulian Antoniac, Gultekin Goller, Baris Yavas, Dan Gheorghe, Aurora Antoniac, Ion Ciuca, Augustin Semenescu, Anca Daniela Raiciu, Ioan Cristescu
MATERIALE PLASTICE
(2019)