Skip Navigation
Skip to contents

Journal of Powder Materials : Journal of Powder Materials

OPEN ACCESS
SEARCH
Search

Search

Page Path
HOME > Search
5 "superalloy"
Filter
Filter
Article category
Keywords
Publication year
Authors
Funded articles
Research Article
Article image
TiO2 Thin Film Coating on an Nb-Si–Based Superalloy via Atomic Layer Deposition
Ji Young Park, Su Min Eun, Jongmin Byun, Byung Joon Choi
J Powder Mater. 2024;31(3):255-262.   Published online June 27, 2024
DOI: https://doi.org/10.4150/jpm.2024.00052
  • 609 View
  • 30 Download
AbstractAbstract PDF
Nano-oxide dispersion–strengthened (ODS) superalloys have attracted attention because of their outstanding mechanical reinforcement mechanism. Dispersed oxides increase the material’s strength by preventing grain growth and recrystallization, as well as increasing creep resistance. In this research, atomic layer deposition (ALD) was applied to synthesize an ODS alloy. It is useful to coat conformal thin films even on complex matrix shapes, such as nanorods or powders. We coated an Nb-Si–based superalloy with TiO2 thin film by using rotary-reactor type thermal ALD. TiO2 was grown by controlling the deposition recipe, reactor temperature, N2 flow rate, and rotor speed. We could confirm the formation of uniform TiO2 film on the surface of the superalloy. This process was successfully applied to the synthesis of an ODS alloy, which could be a new field of ALD applications.
Articles
Article image
Evaluation of Mechanical Properties and Microstructure Depending on Sintering Heating Rate of IN 939W Alloy
Junhyub Jeon, Junho Lee, Namhyuk Seo, Seung Bae Son, Jae-Gil Jung, Seok-Jae Lee
J Powder Mater. 2022;29(5):399-410.   Published online October 1, 2022
DOI: https://doi.org/10.4150/KPMI.2022.29.5.399
  • 419 View
  • 8 Download
AbstractAbstract PDF

Changes in the mechanical properties and microstructure of an IN 939 W alloy according to the sintering heating rate were evaluated. IN 939 W alloy samples were fabricated by spark plasma sintering. The phase fraction, number density, and mean radius of the IN 939W alloy were calculated using a thermodynamic calculation. A universal testing machine and micro-Vickers hardness tester were employed to confirm the mechanical properties of the IN 939W alloy. X-ray diffraction, optical microscopy, field-emission scanning electron microscopy, Cs-corrected-field emission transmission electron microscopy, and energy dispersive X-ray spectrometry were used to evaluate the microstructure of the alloy. The rapid sintering heating rate resulted in a slightly dispersed γ' phase and chromium oxide. It also suppressed the precipitation of the η phase. These helped to reinforce the mechanical properties.

Article image
Analysis on Milling Behavior of Oxide Dispersion Strengthened Ni-based Atomizing Powder with Ni5Y Intermetallic Phase
Chun Woong Park, Jong Min Byun, Won June Choi, Young Do Kim
J Korean Powder Metall Inst. 2019;26(2):101-106.   Published online April 1, 2019
DOI: https://doi.org/10.4150/KPMI.2019.26.2.101
  • 225 View
  • 0 Download
  • 2 Citations
AbstractAbstract PDF

Ni-based oxide dispersion strengthened (ODS) alloys have a higher usable temperature and better hightemperature mechanical properties than conventional superalloys. They are therefore being explored for applications in various fields such as those of aerospace and gas turbines. In general, ODS alloys are manufactured from alloy powders by mechanical alloying of element powders. However, our research team produces alloy powders in which the Ni5Y intermetallic phase is formed by an atomizing process. In this study, mechanical alloying was performed using a planetary mill to analyze the milling behavior of Ni-based oxide dispersions strengthened alloy powder in which the Ni5Y is the intermetallic phase. As the milling time increased, the Ni5Y intermetallic phase was refined. These results are confirmed by SEM and EPMA analysis on microstructure. In addition, it is confirmed that as the milling increased, the mechanical properties of Ni-based ODS alloy powder improve due to grain refinement by plastic deformation.

Citations

Citations to this article as recorded by  
  • Efficient prediction of corrosion behavior in ternary Ni-based alloy systems: Theoretical calculations and experimental verification
    Xuelian Xiao, Keke Chang, Kai Xu, Ming Lou, Liping Wang, Qunji Xue
    Journal of Materials Science & Technology.2023; 167: 94.     CrossRef
  • Effect of high-energy ball milling on the microstructure and mechanical properties of Ni-based ODS alloys fabricated using gas-atomized powder
    Chun Woong Park, Won June Choi, Jongmin Byun, Young Do Kim
    Journal of Materials Science.2022; 57(38): 18195.     CrossRef
Article image
Analyses of Creep Properties of Ni-base Superalloy Powders as Cooling Rate after Solid Solution Heat Treatment
Chan Jun, Youngseon Lee, Byeong Beom Bae, Hong-Kyu Kim, Seong Suk Hong, Donghoon Kim, Jondo Yun, Eun Yoo Yoon
J Korean Powder Metall Inst. 2016;23(3):247-253.   Published online June 1, 2016
DOI: https://doi.org/10.4150/KPMI.2016.23.3.247
  • 179 View
  • 0 Download
AbstractAbstract PDF

In this study, solid solution heat treatment of consolidated nickel-based superalloy powders is carried out by hot isotactic pressing. The effects of the cooling rate of salt quenching, and air cooling on the microstructures and the mechanical properties of the specimens are analyzed . The specimen that is air cooled shows the formation of serrated grain boundaries due to their obstruction by the carbide particles. Moreover, the specimen that is salt quenched shows higher strength than the one that is air cooled due to the presence of fine and close-packed tertiary gamma prime phase. The tensile elongation at high temperatures improves due to the presence of grain boundary serrations in the specimen that is air cooled. On the contrary, the specimen that is salt quenched and consists of unserrated grain boundaries shows better creep properties than the air cooled specimen with the serrated grain boundaries, due to the negative creep phenomenon.

Article image
Simulation and Experiment of Injection Molding Process for Superalloy Feedstock
Im Doo Jung, Youngmoo Kim, Seong Jin Park
J Korean Powder Metall Inst. 2015;22(1):1-5.   Published online February 1, 2015
DOI: https://doi.org/10.4150/KPMI.2015.22.1.1
  • 95 View
  • 1 Download
  • 2 Citations
AbstractAbstract PDF

Powder injection molding is an important manufacturing technology to mass produce superalloy components with complex shape. Injection molding step is particularly important for realizing a desired shape, which requires much time and efforts finding the optimum process condition. Therefore computer aided engineering can be very useful to find proper injection molding conditions. In this study, we have conducted a finite element method based simulation for the spiral mold test of superalloy feedstock and compared the results with experimental ones. Sensitivity analysis with both of simulation and experiment reveals that the melt temperature of superalloy feedstock is the most important factor for the full filling of mold cavity. The FEM based simulation matches well the experimental results. This study contributes to the optimization of superalloy powder injection molding process.

Citations

Citations to this article as recorded by  
  • Powder Injection Molding Process in Industrial Fields
    Joo Won OH, Chang Woo GAL, Daseul SHIN, Jae Man PARK, Woo Seok YANG, Seong Jin PARK
    Journal of the Japan Society of Powder and Powder Metallurgy.2018; 65(9): 539.     CrossRef
  • Effect of Diamond Particle Size on the Thermal Shock Property of High Pressure High Temperature Sintered Polycrystalline Diamond Compact
    Ji-Won Kim, Min-Seok Baek, Hee-Sub Park, Jin-Hyeon Cho, Kee-Ahn Lee
    Journal of Korean Powder Metallurgy Institute.2016; 23(5): 364.     CrossRef

Journal of Powder Materials : Journal of Powder Materials
TOP