Effect of silicon on hot shortness in Fe-Cu-Ni-Sn-Si alloys during isothermal oxidation in air

Erica Sampson, Seetharaman Sridhar

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Residual Cu in scrap-based EAF steel leads to a surface-cracking phenomenon known as surface hot shortness. Si is known to provide a potential reduction in hot shortness; however, the mechanisms involved are not fully understood for low Si quantities. The current study aims to determine a window of Si contents with a given Ni content needed to counteract the negative effects of Sn and Cu to reduce hot shortness and to determine the mechanism. Thermogravimetric analysis (TG), SEM-EDS, XRD, and TEM were used to study the hot shortness behavior of Fe containing 0.2 pct Cu, 0.05 pct Ni, 0.01 pct Sn and with varying Si-content (0.02 pct, 0.1 pct, 0.15 pct, and 0.2 pct Si). It was found that the fayalite formation resulting in a reduction of oxidation and consequently liquid Cu formation occurred for all Si contents examined. The range of Si contents between 0.1 and 0.2 wt pct Si exhibited a mechanism that was a combination of fayalite formation impeding oxidation as well as occlusion of the Cu-rich liquid. This range was acceptable to alleviate hot shortness.

Original languageEnglish (US)
Pages (from-to)1124-1136
Number of pages13
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume44
Issue number5
DOIs
StatePublished - Oct 2013
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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