Microstructure and Mechanical Characterization of Rapidly Solidified Cr-C Tool Steel - Annealing Effects

• Author(s) / Creator(s)

  • P. Delshad Khatibi

• The effect of isochronal annealing on D2 tool steel powder, rapidly solidified via both Impulse Atomization and Water Atomization, has been evaluated using high-resolution scanning electron microscopy and Vickers microhardness. The amount of supersaturation of the alloying elements inside the retained austenite phase as a function of eutectic undercooling was calculated. The fraction of austenite transformed to ferrite at different annealing temperatures (from 350°C to 810°C) was also determined, using Rietveld analysis. The results show that although the particles with larger eutectic undercooling have larger supersaturation of alloying elements within the retained austenite phase, they have a smaller fraction of austenite to ferrite transformation at the temperature in which transformation starts. The maximum hardness was achieved at an annealing temperature of 550°C, due to the formation of fine and well-distributed carbides.

• Date created

  2016

• Subjects / Keywords

  • Rapid Solidification
  • Tool Steel
  • Retained Austenite
  • Micro-structure
  • Powder Processing

• Type of Item

  Article (Published)

• DOI

  https://doi.org/10.7939/R3V40KD0D

• License

  Attribution-NonCommercial-NoDerivatives 4.0 International