Aging behaviour of cobalt free chromium containing maraging steels

A. Gemperle, J. Gemperlová, W. Sha, G. D.W. Smith

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

This paper reports an investigation of the aging behaviour of two Co free Cr containing maraging steels (Fe–1.0Si–11.2Cr–1.3Mo–9.1Ni–1.2Al–1.0Ti and Fe–0.8Si–17.2Cr–6.1Ni–0.4Al–0.9Ti, all at.-%), using hardness measurements, electron microscopy of replicas and thin foils, atom probe field ion microscopy (APFIM), and thermochemical calculations. Two different families of intermetallic phases (Ti6Si7Ni16G phase and η Ni3Ti) have been found to contribute to age hardening. The composition and morphology of these precipitates were studied in deformed and undeformed alloys after aging at 420–570°C for various times. In addition, reverted austenite has been found in the aged structure. Results obtained using APFIM are compared with equilibrium thermodynamic calculations and previous APFIM studies of conventional Cr free low Al and Si maraging steels having higher Mo contents.

Original languageEnglish
Pages (from-to)546-554
Number of pages9
JournalMaterials Science and Technology (United Kingdom)
Volume8
Issue number6
DOIs
Publication statusPublished - 1992

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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