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- Title
EFFECT OF SINTERING HOLDING TIME AND COOLING RATE ON THE AUSTENITE STABILITY AND MECHANICAL PROPERTIES OF NANOCRYSTALLINE FeCrC ALLOY.
- Authors
GWANGHUN KIM; JUNHYUB JEON; NAMHYUK SEO; SEUNGGYU CHOI; MIN-SUK OH; SEUNG BAE SON; SEOK-JAE LEE
- Abstract
The effects of the sintering holding time and cooling rate on the microstructure and mechanical properties of nanocrystalline Fe-Cr-C alloy were investigated. Nanocrystalline Fe-1.5Cr-1C (wt.%) alloy was fabricated by mechanical alloying and spark plasma sintering. Different process conditions were applied to fabricate the sintered samples. The phase fraction and grain size were measured using X-ray powder diffraction and confirmed by electron backscatter diffraction. The stability and volume fraction of the austenite phase, which could affect the mechanical properties of the Fe-based alloy, were calculated using an empirical equation. The sample names consist of a number and a letter, which correspond to the holding time and cooling method, respectively. For the 0A, 0W, 10A, and 10W samples, the volume fraction was measured at 5.56, 44.95, 6.15, and 61.44 vol.%. To evaluate the mechanical properties, the hardness of 0A, 0W, 10A, and 10W samples were measured as 44.6, 63.1, 42.5, and 53.8 HRC. These results show that there is a difference in carbon diffusion and solubility depending on the sintering holding time and cooling rate.
- Subjects
POWDER metallurgy; MECHANICAL alloying; X-ray powder diffraction; AUSTENITE; SINTERING; ALLOYS; COBALT nickel alloys
- Publication
Archives of Metallurgy & Materials, 2021, Vol 66, Issue 3, p759
- ISSN
1733-3490
- Publication type
Article
- DOI
10.24425/amm.2021.136376