Carbide dispersion carburizing (CDC) of Fe-Mo-V based high-speed steels

Ikuo Ohnuma, Ryosuke Kainuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The carbide dispersion carburizing process was applied to Fe-based high-speed steels, which contained multiple carbide-forming elements, Mo and V. Fine carbides precipitated during the carburization and the dispersed particles in the Fe-Mo-V-C alloys heat-treated at 1 200°C were identified as VC, (Mo, V)2C, and (Fe,Mo)6C, which behave as effective inhibitors against the grain growth of austenite and as reinforcers resulting in increased hardness of the martensitic matrix. The maximum Vickers hardness of the Fe-10Mo5V-2.05C alloy quenched from 1 200°C and tempered at 600°C achieved values of 1 100 and 1 000, respectively. Thermodynamic calculation of the Fe-Mo-V-C quaternary system proved to be useful for optimizing the composition of carbide forming elements, the carburizing conditions, and the microstructure of carburized and solution-treated alloys.

Original languageEnglish
Pages (from-to)310-315
Number of pages6
JournalISIJ International
Issue number2
Publication statusPublished - 2006


  • Carbide
  • Carburization
  • Heat treatment
  • High-speed steel
  • Phase diagram


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