Read Online Fracture Studies on High Hardness BISALLOY 500(R) Steel - DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA); Khan, M. Z.; Alkemade, S. J.; Weston, G. M. file in PDF Online

1998-03 Genre/Form: Text Material Type: Internet resource Document Type: Internet Resource, Archival Material All Authors / Contributors: DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA); Khan, M. Z.; Alkemade, S. J.; Weston, G. M. OCLC Number: 831665617 Language Note: English Notes: text/html Abstract: Mechanical properties of a high hardness alloy steel containing microstructural banding were determined in both transverse (T-L) and longitudinal (L-T) orientations with respect to the rolling direction. Tests undertaken included tensile, Charpy impact, fracture toughness, stress corrosion and constant amplitude fatigue. The specimen orientation was found to have little influence on the tensile properties however, Charpy V-notch specimens tested in the L-T orientation showed impact energy values four times higher than those in the T-L orientation. When fatigue tested, microstructural banding in the steel caused secondary cracking normal to the primary crack direction which in turn was found to influence crack propagation and fracture resistance. Discontinuous bands normal to the direction of the primary fracture plane (L-T orientation) were beneficial in resisting crack extension whereas, when the bands were continuous (T-L orientation), they were detrimental to the overall fracture process. The morphology of secondary cracking in the L-T orientation was different to the secondary cracking observed in the T-L orientation. Secondary cracking in the L-T orientation promoted crack arrest and resulted in higher mechanical properties when compared with specimens tested in T-L orientation.