Modelling and characterisation of Mo2C precipitation and cementite Dissolution during the tempering of Fe-C-Mo martensitic steel

S. Yamasaki and H.K.D.H. Bhadeshia


The precipitation and Ostwald ripening behaviour of needle shaped Mo2C particles during the tempering of a ternary Fe-C-Mo martensitic steel have been characterised and modelled, taking account of local equilibrium, the capillarity effect, and the simultaneous enrichment and dissolution of cementite. Particles of Mo2C are represented as paraboloids of revolution, with the tip radius chosen to yield the maximum lengthening rate. Transmission electron microscopy has been used to validate the theory; measurements of the average length, volume fraction, and number density of particles showed good agreement with experimental observations.

Materials Science and Technology, Vol. 19 (2003) 723-731.

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Tempered martensite

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