A new high carbon, high silicon and high manganese steel containing about 1 percent carbon, 3.0 percent silicon and 2.0 percent manganese has been developed. This steel has been synthesized using the concepts from Austempered Ductile Cast Iron (ADI) technology. The influence of austempering process on the microstructure and the room temperature mechanical properties of the this steel has been examined. The influence of microstructure on the plain strain fracture toughness of this new steel was also studied. The test results showed that the austempering process has resulted in a significant improvement in hardness as well as the fracture toughness of the material.
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