Mechanism of network carbide precipitation inhibited by aluminum in ultra-high carbon steel

Shu Qin Shi, Nan Ju Gu, T. Furuhara, T. Maki, Guang Chen

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The influence of Al on the separation of netlike carbide in the Ultra High Carbon Steel (UHCS) is investigated by CAPHAD, EDS analysis and microstructural observation. It is found that the Al content strongly influences the separation of netlike carbide in the UHCS with 1.5wt%C. With Al increasing, the Austenite grain size decreases and the amount of grain boundary increases, thus the forming of netlike carbide is restrained. The undissolved carbide increases, the carbon dissolved in austenite decreases, thus the driving force for the separation of netlike carbide becomes less. The enrichment of Al around the grain boundaries also retards the nucleation and growth of netlike carbides. When the Al content approaches 2.0wt%, the network carbide tends to be discontinues, and even no carbide is observed in some grain boundaries, this kind of netlike carbide is easy to be spheroidized during spheroidizing.

Original languageEnglish
Pages (from-to)79-82
Number of pages4
JournalCailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment
Volume26
Issue number4
Publication statusPublished - 2005 Aug 1
Externally publishedYes

Keywords

  • Aluminum
  • Network carbide
  • Ultra-high carbon steel

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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