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Open AccessFeature PaperArticle

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

School of Materials Science and Engineering, University of New South Wales, 2052 Sydney, Australia
Department of Materials and Textile Engineering, Razi University, Kermanshah 6714414971, Iran
Author to whom correspondence should be addressed.
Metals 2020, 10(5), 671;
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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