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A New Continuous Cooling Transformation Diagram for AISI M4 High-Speed Tool Steel

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Abstract

The increasing evolution of dilatometric techniques now allows for the identification of structural transformations with very low signal. The use of dilatometric techniques coupled with more common techniques, such as metallographic, hardness testing, and x-ray diffraction allows to plot a new CCT diagram for AISI M4 high-speed tool steel. This diagram is useful for a better selection of alternate solutions, hardening, and tempering heat treatments. More accurate determination of the various fields of transformation of austenite during its cooling was made. The precipitation of carbides highlighted at high temperature is at the origin of the martrensitic transformation into two stages (splitting phenomena). For slow cooling rates, it was possible to highlight the ferritic, pearlitic, and bainitic transformation.

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Correspondence to Jalel Briki.

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Briki, J., Ben Slima, S. A New Continuous Cooling Transformation Diagram for AISI M4 High-Speed Tool Steel. J. of Materi Eng and Perform 17, 864–869 (2008). https://doi.org/10.1007/s11665-008-9238-0

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  • DOI: https://doi.org/10.1007/s11665-008-9238-0

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