Gaseous nitriding of additively manufactured maraging steel; nitriding kinetics and microstructure evolution

Cecilie V. Funch*, Thomas L. Christiansen, Marcel A.J. Somers

*Corresponding author for this work

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Abstract

The nitriding response of additively manufactured M300 maraging tool steel was investigated through a series of nitriding treatments at different temperatures in the range 360–480 °C for a duration of 40 h. The interaction between nitrogen and alloying element nitrides (Ti and Mo) and intermetallics (Ni3Ti and Ni3Mo) was studied by comparing nitriding responses of as-solution treated and subsequently aged specimens. The nitriding behavior was found to depend strongly on the initial condition of the material and the nitriding temperature applied. Ultra-low temperature nitriding at 360 °C was found to be feasible as it resulted in a nitrided case, albeit with incomplete precipitation hardening of the bulk structure, thus resulting in a softer core. The application of a post-ageing treatment resulted in full bulk hardening and distinctly changed the appearance of the hardness profile.
Original languageEnglish
Article number128055
JournalSurface and Coatings Technology
Volume432
Number of pages13
ISSN0257-8972
DOIs
Publication statusPublished - 2022

Keywords

  • Additive manufacturing
  • Maraging steel
  • Gaseous nitriding
  • Nitriding kinetics
  • Microstructure evolution

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