- Fabrication and Tensile Properties of Alloy 617 base ODS Alloy
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Hyoung-Kee Min, Suk-Hoon Kang, Tae-Kyu Kim, Chang-Hee Han, Do-Hyang Kim, Jin-Sung Jang
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J Korean Powder Metall Inst. 2011;18(6):482-487.
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DOI: https://doi.org/10.4150/KPMI.2011.18.6.482
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- Alloy 617, Ni-22Cr-12Co-9Mo base oxide dispersion strengthened alloy was fabricated by using mechanical alloying, hot isostatic pressing and hot rolling. Uniaxial tensile tests were performed at room temperature and at 700°C. Compared with the conventional Alloy 617, ODS alloy showed much higher yield strength and tensile strength, but lower elongation. Fracture surfaces of the tensile tested specimens were investigated in order to find out the mechanism of fracture mode at each test temperature. Grain adjustment during tensile deformation was analyzed by electron backscattered diffraction mapping, inverse pole figures and TEM observation.
- Microstructural Evaluation and High Temperature Mechanical Properties of Ni-22Cr-18Fe-9Mo ODS Alloy
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Seok-Hoan Jeong, Suk-Hoon Kang, Chang-Hee Han, Tae-Kyu Kim, Do-Hyang Kim, Jin-Sung Jang
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J Korean Powder Metall Inst. 2011;18(5):456-462.
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DOI: https://doi.org/10.4150/KPMI.2011.18.5.456
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- Yttrium oxide is one of the most thermo-dynamically stable materials, so that it is generally used as a dispersoid in many kinds of dispersion strengthed alloys. In this study, a nickel-base superalloy is strengthened by dispersion of yttrium oxide particles. Elemental powders with the composition of Ni-22Cr-18Fe-9Mo were mechanically alloyed(M.A.) with 0.6 wt% Y_2O_3. The MA powders were then HIP(hot isotactic press)ed and hot rolled. Most oxide particles in Ni-22Cr-18Fe-9Mo base ODS alloy were found to be Y-Ti-O type. The oxide particles were uniformly dispersed in the matrix and also on the grain boundaries. Tensile test results show that the yield strength and ultimate tensile strength of ODS alloy specimens were 1.2~1.7 times higher than those of the conventional HastelloyTM X(R), which has the same chemical compositions with ODS alloy specimens except the oxide particles.
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Citations
Citations to this article as recorded by  - Effect of Y2O3 dispersoids on microstructure and creep properties of Hastelloy X processed by laser powder-bed fusion
Jovid U. Rakhmonov, Christoph Kenel, Anthony De Luca, Christian Leinenbach, David C. Dunand
Additive Manufacturing Letters.2022; 3: 100069. CrossRef - Evaluation of Creep Reliability of Powder Metallurgy and Cast-type Ni-based Superalloy by Using Ultrasonic Wave
Chan-Yang Choi, Jin-Hun Song, Se-Ung Oh, Chung-Seok Kim, Sook-In Kwun, Sung-Tag Oh, Chang-Yong Hyun, Jai-Won Byeon
Journal of Korean Powder Metallurgy Institute.2012; 19(3): 215. CrossRef
- Effects of the Sintering Variable on Impact Energy in MA 316L ODS and Wet 316L ODS Stainless Steels
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Sung-Soo Kim, Chang-Hee Han, Jin-Sung Jang
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J Korean Powder Metall Inst. 2010;17(2):113-122.
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DOI: https://doi.org/10.4150/KPMI.2010.17.2.113
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- Two kinds of oxide-dispersion-strengthened (ODS) 316L stainless steel were manufactured using a wet mixing process(wet) and a mechanical alloying method (MA). An MA 316L ODS was prepared by a mixing of metal powder and a mechanical alloying process. A wet 316L ODS was manufactured by a wet mixing with 316L stainless steel powder. A solution of yttrium nitrate was dried after being in the wet 316L ODS alloy. The results showed that carbon and oxygen were effectively reduced during the degassing process before the hydroisostatic process (HIP) in both alloys. It appeared that the effect of HIP treatment on increase in impact energy was pronounced in the MA 316L ODS alloy. The MA 316L ODS alloy showed a higher yield strength and a smaller elongation, when compared to the wet 316L ODS alloy. This seemed to be attributed to the enhancement of bonding between oxide and matrix particles from HIP and to the presence of a finer oxide of about 20 nm from the MA process in the MA 316L ODS alloy.
- Fabrication and Characterization of ODS 316L Stainless Steels
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Min-Ho Kim, Ho-Jin Ryu, Sung-Soo Kim, Chang-Hee Han, Jin-Sung Jang, Oh-Jong Kwon
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J Korean Powder Metall Inst. 2009;16(2):122-130.
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DOI: https://doi.org/10.4150/KPMI.2009.16.2.122
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- Austenitic oxide-dispersion-strengthened (ODS) stainless steel was fabricated using a wet mixing process without a mechanical milling in order to reduce contaminations of impurities during their fabrication process. Solution of yttrium nitrate was dried after a wet mixing with 316L stainless steel powder. Carbon and oxygen contents were effectively reduced by this wet processing. Microstructural analysis showed that coarse yttrium silicates of about 150 nm were formed in austenitic ODS steels with a silicon content of about 0.8 wt%. Wet-processed austenitic ODS steel without silicon showed higher yield strength by the presence of finer oxide of about 20 nm.
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