- Characterization of Hot Isostatically Pressed Ni-Based Superalloy IN 713C
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Youngmoo Kim, Eun-Pyo Kim, Seong-Taek Chunga, Seong Lee, Joon-Woong Noh, Sung Ho Lee, Young-Sam Kwon
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J Korean Powder Metall Inst. 2013;20(4):264-268.
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DOI: https://doi.org/10.4150/KPMI.2013.20.4.264
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- Nickel-based superalloy IN 713C powders have been consolidated by hot isostatic pressing (HIPing). The microstructure and mechanical properties of the superalloys were investigated at the HIPing temperature ranging from 1030°C to 1230°C. When the IN 713C powder was heated above gammaprime solvus temperature (about 1180°C), the microstructure was composed of the austenitic FCC matrix phase gamma plus a variety of secondary phases, such as gammaprime precipitates in gamma matrix and MC carbides at grain boundaries. The yield and tensile strengths of HIPed specimens at room temperature were decreased while the elongation and reduction of area were increased as the processing temperature increased. At 700°C, the strength was similar regardless of HIPing temperature; however, the ductility was drastically increased with increasing the temperature. It is considered that these properties compared to those of cast products are originated from the homogeneity of microstructure obtained from a PM process.
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Citations to this article as recorded by  - Sintering and Microstructures of SUS 316L Powder Produced by 3D Printing Process
W.J. Kim, H.-H. Nguyen, H.Y. Kim, M.-T. Nguyen, H.S. Park, J.-C. Kim
Archives of Metallurgy and Materials.2017; 62(2): 1215. CrossRef
- Application of Refractory Metal Powders to Military Material Fields
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Young-Moo Kim, Eun-Pyo Kim, Seong Lee, Joon-Woong Noh
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J Korean Powder Metall Inst. 2007;14(4):221-229.
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DOI: https://doi.org/10.4150/KPMI.2007.14.4.221
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154
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Citations to this article as recorded by - Synthesis and Nucleation Behavior of MoO3 Nano Particles with Concentration of Precursors
Seyoung Lee, Namhun Kwon, Jaeseok Roh, Kun-Jae Lee
Journal of Korean Powder Metallurgy Institute.2020; 27(5): 394. CrossRef - Fabrication of Ultra Fine Grained Molybdenum and Mechanical Properties
Se-Hoon Kim, Young-Ik Seo, Dae-Gun Kim, Myung-Jin Suk, Young-Do Kim
Journal of Korean Powder Metallurgy Institute.2010; 17(3): 235. CrossRef
- A Study on the Reduction Mechanism of Tungsten and Copper Oxide Composite Powders
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Seong Lee, Moon-Hee Hong, Eun-Pyo Kim, Sung-Ho Lee, Joon-Woong Noh
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J Korean Powder Metall Inst. 2003;10(6):422-429.
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DOI: https://doi.org/10.4150/KPMI.2003.10.6.422
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- The reduction mechanism of the composite powders mixed with WO_3 and CuO has been studied by using thermogravimetry (TG), X-ray diffraction, and microstructure analyses. The composite powders were made by simple Turbula mixing, spray drying, and ball-milling in a stainless steel jar with the ball to powder ratio of 32 to 1 at 80 rpm for 1 h without process controlling agents. It is observed that all the oxide composite powders are converted to W-coated Cu composite powder after reducing treatment under hydrogen atmosphere. For the formation mechanism of W-coated Cu composite powder, the sequential reduction steps are proposed as follows: CuO contained in the ball-milled composite powder is initially reduced to Cu at the temperature range from 200°C to 300°C. Then, WO_3 powder is reduced to W O_2 via W O_2.9 and W O_2.72 at higher temperature region. Finally, the gaseous phase of WO_3(OH)_2 formed by reaction of WO_2 with water vapour migrates to previously reduced Cu and deposits on it as W reduced by hydrogen. The proposed mechanism has been proved through the model experiment which was performed by using Cu plate and WO_3 powder.
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