FRACTURE TOUGHNESS EVALUATION OF TITANIUM, ALUMINUM, AND STEEL.
PITMAN-DUNN RESEARCH LABS FRANKFORD ARSENAL PHILADELPHIA PA
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The plane strain fracture toughness of 2014-T6 aluminum alloy, 6Al-4V titanium alloy, and 4340 steel has been investigated at room temperature and at -75F, using the single edge notched specimen. Data for the 2014-T6 aluminum alloy, 6Al-4V titanium alloy, and 4340 steel, quenched and tempered to Rockwell C 50 hardness, showed the plane strain fracture toughness to be insensitive to testing temperature. The specimens of 4340 steel, quenched and tempered to Rockwell C 30 hardness, were too small for accurate plane strain fracture toughness values, but the results indicate that no transition occurred over the range of testing temperature investigated. The cycle-annealed specimens of 4340 steel indicated a sensitivity of plane strain fracture toughness to testing temperature. These data show the superiority of the quenched and tempered structure to mixed structure, even though both are at the same hardness level. Author
- Metallurgy and Metallography