J. M. Gregg and H. K. D. H. Bhadeshia


Experiments have been conducted to study the nucleation of bainite at interfaces between ceramic compounds and low-alloy steels. To facilitate this, chemically pure mineral powders were pressure bonded to steel samples. The resulting composite samples were then heat treated to induce transformation, and hence compare the transformation behaviour in the vicinity of the ceramic/steel interface to that within the bulk of the steel. It is found that the minerals may be categorised into three groups, according to their observed efficacy in inducing the nucleation of bainite.The dominant reason for the stimulation of bainite nucleation seems to be a chemical interaction between the mineral and the steel. One noteable exception is TiO, which, within the limits of resolution, appears to remain inert, and yet enhances bainite formation.

ACTA METALLURGICA ET MATERIALIA, 1994, Vol.42, No.10, pp.3321- 3330.

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Bainitic Phase Transformations

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