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Diffusion in MC Carbides in High-Speed Steels during High-Temperature Treatments

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Abstract:

The microstructure and chemical composition of MC carbides in the modified variants of AISI M2 type high-speed steel after casting, annealing, carburising and subsequent final heat treatment (quenching and tempering) have been studied by focusing on diffusion processes in these carbides and their stability during high-temperature treatments. Significant changes in both the microstructure and chemical composition of the MC carbides as well as in their volume fraction shown to occur in the high-speed steels studied were attributed to decomposition, coagulation and dissolution of these carbides during heat treatments caused by strong diffusion of alloying elements and carbon. It was also shown that boron, in general, strongly suppressed the diffusion of carbon during carburising.

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Periodical:

Defect and Diffusion Forum (Volumes 297-301)

Pages:

1065-1070

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.297-301.1065

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Online since:

April 2010

Authors:

Alexander S. Chaus, Matej Beznák

Keywords:

Diffusion, Heat Treatment, High Speed Steel, MC Carbide, Microstructure

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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References

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