Ultra-Fine Grain Processing of Steel Billet – Phase I – Effect of Initial Microstructure on the Microstructural Evolution and Tensile Properties of 4140 Steel

Thomas Kozmel, Ryan Cassel and Sammy Tin, Illinois Institute of Technology This investigation showed that the starting microstructure of 4140 steel plays a major role in the development of thermal – mechanical processes capable of producing sub-micron grain sizes.

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