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- Title
MICROSTRUCTURE AND HIGH TEMPERATURE OXIDATION PROPERTIES OF Fe-Cr-Ni HK30 ALLOY MANUFACTURED BY METAL INJECTION MOLDING.
- Authors
DONG-YEOL WI; YOUNG-KYUN KIM; TAE-SIK YOON; KEE-AHN LEE
- Abstract
This study investigated the microstructure and high temperature oxidation properties of Fe-25Cr-20Ni-1.5Nb, HK30 alloy manufactured by metal injection molding (MIM) process. The powder used in MIM had a bi-modal size distribution of 0.11 and 9.19 µm and had a spherical shape. The initial powder consisted of γ-Fe and Cr23C6 phases. Microstructural observation of the manufactured (MIMed) HK30 alloy confirmed Cr23C6 along the grain boundary of the γ-Fe matrix, and NbC was distributed evenly on the grain boundary and in the grain. After a 24-hour high temperature oxidation test at air atmospheres of 1000, 1100 and 1200°C, the oxidation weight measured 0.72, 1.11 and 2.29 mg/cm,2 respectively. Cross-sectional observation of the oxidation specimen identified a dense Cr2O3 oxide layer at 1000°C condition, and the thickness of the oxide layer increased as the oxidation temperature increased. At 1100°C and 1200°C oxidation temperatures, Fe-rich oxide was also formed on the dense Cr2O3 oxide layer. Based on the above findings, this study identified the high-temperature oxidation mechanism of HK30 alloy manufactured by MIM.
- Subjects
INJECTION molding of metals; HIGH temperatures; ALLOYS; MICROSTRUCTURE; OXIDATION
- Publication
Archives of Metallurgy & Materials, 2019, Vol 64, Issue 2, p525
- ISSN
1733-3490
- Publication type
Article
- DOI
10.24425/amm.2019.127571