Influence of cooling and reheating on the evolution of copper rich liquid in high residual low carbon steels

B. A. Webler, E. M. Nick, R. O'Malley, S. Sridhar

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This study investigates some effects of austenite microstructure on processes leading to copper hot shortness. Low carbon steels containing 0·55 wt-% copper were subjected to two thermal profiles in an infrared image furnace with attached confocal scanning laser microscope: hold at 1150°C for 60 s; hold at 1150°C for 60 s, quench to 400°C, reheat to 1150°C. Heat treatments were conducted in dried/deoxidised argon to image microstructures. Subsequent samples were oxidised in air. The oxide/metal interface was studied in a scanning electron microscope. Additional confocal scanning laser microscope experiments involved melting copper directly on the steel. After quench/reheat, austenite grain size decreased by a factor of ∼1·7 and grain boundaries were redistributed. Copper evolved during the first heating was no longer found at boundaries. Results from direct copper exposure reveal an apparent effect of boundary character on copper penetration rate. Possible mechanisms by which hot shortness is affected are discussed.

Original languageEnglish (US)
Pages (from-to)473-480
Number of pages8
JournalIronmaking and Steelmaking
Volume35
Issue number6
DOIs
StatePublished - Aug 2008
Externally publishedYes

Keywords

  • Copper
  • High residual containing steels
  • Phase transformation
  • Surface hot shortness

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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