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Metallurgical and Materials Transactions A

, Volume 37, Issue 4, pp 1107–1116 | Cite as

Age hardening and mechanical properties of a 2400 MPa grade cobalt-free maraging steel

  • Yi He
  • Ke Yang
  • Kai Liu
  • Wei Sha
  • Zhanli Guo
Article

Abstract

The age hardening kinetics in the temperature range of 713 to 813 K of a 2400 MPa grade cobalt-free maraging steel (Fe-(18.8 ∼ 19.1) pct Ni-(4.4 ∼ 5.4) pct Mo-2.6 pct Ti, wt pct) has been studied. Study of microstructure and mechanical properties showed that a high number of Ni3Ti and Fe2(Mo,Ti) precipitates were formed during the ageing process, which resulted in high strength and relatively low fracture toughness. Ni3Ti was the main precipitation phase. Fractography has shown ductile failure of tensile and fracture toughness specimens. Thermodynamic calculations showed that the equilibrium phases are Ni3Ti, Fe2(Mo,Ti), ferrite, and austenite.

Keywords

Austenite Martensite Fracture Toughness Material Transaction Prior Austenite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2006

Authors and Affiliations

  • Yi He
    • 1
  • Ke Yang
    • 2
  • Kai Liu
    • 2
  • Wei Sha
    • 3
  • Zhanli Guo
    • 4
  1. 1.Institute of Metal ResearchChinese Academy of SciencesShenyangPeople’s Republic of China
  2. 2.the Institute of Metal ResearchChinese Academy of SciencesShenyangPeople’s Republic of China
  3. 3.Metals Research Group, School of Planning, Architecture and Civil EngineeringThe Queen’s University of BelfastBelfastU.K.
  4. 4.Surrey Technology CentreMaterials Scientist, is with Sente Software Ltd.GuildfordU.K.

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