Warm extrusion of TRIP steels: Process control and tensile properties

M. Azrin*, G. B. Olson, R. A. Gagne

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

TRIP steel rods were warm extruded to reductions of area of 40%, 60% and 80%. Temperature increases on the order of 150 °C were compensated for by adjusting the billet pre-heat temperature to maintain a final extrusion temperature of 450 °C. The 40% and 60% reductions were each performed in on extrusion pass, while the 80% reduction required a two-step sequence (60% followed by 50%). Extrusion constants were determined as 340 MN m-2 (50 klbf in-2) for hot extrusion. 1030 MN m-2 (150 klbf in-2) for single-pass warm extrusion and 2070 MN m-2 (300 klbf in-2) for the second (50%) warm reduction. Tensile tests indicated that a high austenite stability resulting from too low an average working temperature during warm extrusion caused a loss of tensile ductility owing to insufficient working hardening. The austenite stability could be decreased, however, by tempering at 590 °C to remove some carbon from solid solution, giving tensile properties equivalent or superior to those obtained by warm rolling. Difficulties in composition and/or temperature control during the processing of TRIP steels can thus be compensated for by a simple final heat treatment.

Original languageEnglish (US)
Pages (from-to)175-185
Number of pages11
JournalMaterials Science and Engineering
Volume40
Issue number2
DOIs
StatePublished - Jan 1 1979

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Warm extrusion of TRIP steels: Process control and tensile properties'. Together they form a unique fingerprint.

Cite this