Accession Number : AD0283397

Title :   METALLURGICAL VARIABLES AFFECTING FRACTURE TOUGHNESS IN HIGH-STRENGTH SHEET ALLOYS

Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS INST OF GEODESY PHOTOGRAMMETRY AND CARTOGRAPHY

Report Date : JUL 1961

Pagination or Media Count : 1

Abstract : The main object of this study is to determine the relationship between metal structure and fracture toughness in a variety of high-s rength ferrous sheet alloys, with particular attention to the crack initiation and crack propagation stages of the fracture process. Six composition types of low-alloy high-strength sheet materials were procured, including two carbon levels in one composition type. Screening of various thermo-mechanical and heat treating processes (microstructures) is being carried out by fatigue-precracked Charpy tests in both impact and low bending over a range of test temperatures. Room-temperature precracked Charpy impact tests were completed on a variety of microstructures in 0.130-in. D6AC sheet. The low fracture toughness values obtained indicate that this particular sheet is either of inferior quality or requires special heat treatment to put the carbide into solution. (Author)

Descriptors :   *FRACTURE (MECHANICS), *STAINLESS STEEL, *STEEL, AUSTENITE, HEAT TREATMENT, HIGH TEMPERATURE, IMPACT SHOCK, MARTENSITE, MICROSTRUCTURE, SHEETS, TEST METHODS, TRANSITION TEMPERATURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE