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ORNL researchers in partnership with materials scientists from Cummins, Inc. utilized the laboratory’s unique experimental capabilities to understand the fundamental scientific principles underlying Fe-C material property improvements resulting from magnetic field processing. The application of a high flux magnetic field was found to increase the solubility of carbon in austenite by up to 22% which leads to improved properties in martensitic steels used for diesel engine components. This work also provides an experimental explanation for the smaller grain size and finer lathe spacing seen in material quenched or solidified in a static magnetic field which leads to increases in physical properties including hardness, ultimate tensile strength, yield strength, and fatigue strength. The results of this collaboration will help enable commercialization of magnetic field processing for engine components such as gears and camshafts.

Heat Treatment of Iron-Carbon Alloys in a Magnetic Field (Phase 2)