Fracture Toughness of AISI 4340 Steel as a Function of Prior Austenite Grain Size. Document Details Document Type Technical Report Publication Date Dec 01, 1961 Accession Number ADA951136 Entities People Robert N. Katz Tags DTIC Thesaurus Topics Alloys Austenite Chemical Compounds Geometry Grain Size Iron Alloys Mathematics Physical Properties Steel Toughness