• DOI:10.1051/JPHYSCOL:1989869
• Corpus ID: 53649267

A field–ion microscopy and atom probe study of ageing behaviour of a Co–bearing maraging steel

@article{Sha1989AFM,
  title={A field–ion microscopy and atom probe study of ageing behaviour of a Co–bearing maraging steel},
  author={Wei Sha and Alfred Cerezo and George Davey Smith},
  journal={Le Journal De Physique Colloques},
  year={1989},
  volume={50},
  pages={407-412}
}

• W. Sha, A. Cerezo, G. Smith
• Published 1 November 1989
• Materials Science
• Le Journal De Physique Colloques

This paper reports the first atom probe field-ion microscopy (APFIM) study of the ageing reactions in a Co-bearing (C-300) maraging steel (Fe-l8.5%Ni-9.0%Co-4.8%Mo-0.6%Ti-O. l%Al-O.I%Si-0.03%C (wt%)), using both the conventional APFIM and the position-sensitive atom probe (POSAP). Two families of intermetallic phases (Fe7M06 and Ni3(Mo,Ti) types) have been found to contribute to age-hardening. The com~osition and morphology of these precipitates were studied for different ageing times (0.5- 128 hours at 510 C) to investigate the ageing sequence. The observation of the (Fe,Ni,Co)7Mog p-phase is of interest since this is contrary to most published electron diffraction work, but is supported by thermodynamic calculations. Austenite reversion has been found to start after ageing for 4 hours and the reverted austenite approaches the predicted equilibrium composition after ageing for 8 hours.