Microstructure and mechanical properties of low nickel maraging steel

Wei Sha, Anjie Ye, Savko Malinov, Eric Wilson

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Austenitization with lower temperature and intercritical annealing were introduced in the treatment of a maraging steel with a composition of Fe–12.94Ni–1.61Al–1.01Mo–0.23Nb (wt.%). Scanning electron microscopy was employed to study the microstructure after austenitization at 950 °C and intercritical annealing, followed by aging at 485 and 600 °C. X-ray diffraction (XRD) analysis was applied to evaluate the formation of retained or reverted austenite. Thermodynamic calculation was employed to calculate equilibrium phase mole fractions. Hardness and Charpy impact toughness of the steel were measured. Intercritical annealing treatments did not result in significant increase of hardness either before or after aging. The Charpy impact toughness of the alloy in aged condition was enhanced after austenitization at 950 °C. No austenite was observed in XRD. However, suspected reverted austenite was found after austenitization at 950 °C followed by aging at 600 °C for 4 h. Relationships among heat treatment, microstructure and mechanical properties are discussed.
Original languageEnglish
Pages (from-to)129-135
Number of pages7
JournalMaterials Science and Engineering: A
Volume536
Early online date27 Dec 2011
DOIs
Publication statusPublished - 28 Feb 2012

Keywords

  • Mechanical properties
  • Steel
  • Aging
  • Fracture
  • Heat treatment
  • Phase transformations

ASJC Scopus subject areas

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

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