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Open AccessFeature PaperArticle

Particle-Stimulated Nucleation (PSN) in the Co–28Cr–5Mo–0.3C Alloy

1
School of Materials Science and Engineering, University of New South Wales, 2052 Sydney, Australia
2
Department of Materials and Textile Engineering, Razi University, Kermanshah 6714414971, Iran
*
Author to whom correspondence should be addressed.
Metals 2020, 10(5), 671; https://doi.org/10.3390/met10050671
Received: 5 April 2020 / Revised: 8 May 2020 / Accepted: 19 May 2020 / Published: 21 May 2020
(This article belongs to the Special Issue Heat Treatment of Non-ferrous Alloys)
The present work is aimed at refining the grain size in the Co–28Cr–5Mo–0.3C (wt%) cast alloy using particle-stimulated nucleation (PSN) of recrystallization. It is pointed out that PSN resulted in considerable grain refinement (≈80%) of the as-cast structure, leading to an increased yield and tensile strength (around 30%). Partial solutionizing is associated with the formation of γfcc and athermal martensite. During PSN, the intensity of the hexagonal close-packed (hcp) phase increases due to the formation of isothermal martensite. It appears that new dynamic recrystallized (DRX) grains are formed around coarse undissolved particles (≈10 μm in size), especially where these particles are present in large clusters. The high-resolution TEM image shows the formation of heavily faulted regions and subgrains, with maximum misorientation near the carbides providing the driving force for the nucleation of new grains. View Full-Text
Keywords: CoCrMoC alloy; particle-stimulated nucleation; grain size; martensite CoCrMoC alloy; particle-stimulated nucleation; grain size; martensite
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MDPI and ACS Style

Lashgari, H.R.; Zangeneh, S. Particle-Stimulated Nucleation (PSN) in the Co–28Cr–5Mo–0.3C Alloy. Metals 2020, 10, 671.

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