Bainite in steel is the name given to the microstructure which forms at temperatures between those for pearlite and martensite. This phase was first identified by Edgar Bain and Davenport.

In a paper in 1930 they reported the discovery of a new microstructure consisting of an `acicular, dark etching aggregate' which formed in the temperature range between pearlite and martensite and was unlike martensite or pearlite observed in the same steel. Their opinion was that the new microstructure `forms much in the manner of martensite but is subsequently more and less tempered and succeeds in precipitating carbon'.

steel microstructures

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