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Surface and Bulk Carbide Transformations in High-Speed Steel.

M Godec1, T Večko Pirtovšek2, B Šetina Batič1

  • 1Institute of Metals and Technology, Lepi pot 11, 1000 Ljubljana, Slovenia.

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|November 6, 2015
PubMed
Summary
This summary is machine-generated.

Annealing AISI M42 high-speed steel transforms large M2C carbides into smaller M6C and MC carbides. This beneficial transformation refines the microstructure for improved forging performance.

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Area of Science:

  • Metallurgy and Materials Science
  • Physical Chemistry of Solids

Background:

  • AISI M42 high-speed steel is critical in tooling applications.
  • Understanding carbide transformations during thermal processing is essential for optimizing material properties.
  • Carbide morphology and distribution significantly influence mechanical performance.

Purpose of the Study:

  • To investigate the transformation behavior of carbides in AISI M42 steel during annealing within the forging temperature range.
  • To elucidate the mechanisms of carbide evolution and their impact on microstructure.
  • To provide insights for enhancing high-speed steel production and characterization methods.

Main Methods:

  • Thermal analysis of AISI M42 high-speed steel samples.
  • Microstructural characterization using advanced microscopy techniques.
  • Crystallographic orientation analysis of carbide phases.

Main Results:

  • Partial transformation of large, metastable M2C carbides into smaller, stable M6C carbides was observed.
  • Formation of MC carbides concurrently with the M2C to M6C transformation.
  • Significant differences in carbide transformation kinetics between the alloy surface and bulk were identified.

Conclusions:

  • Annealing promotes a beneficial transformation of coarse M2C carbides into a fine, randomly distributed network of M6C and MC carbides.
  • This microstructural refinement is advantageous for subsequent forging operations.
  • Surface-based observations may not fully represent bulk carbide transformation phenomena in high-speed steels.