ON THE DEVELOPMENT OF UNUSUALLY HIGH FATIGUE CRACK PROPAGATION RESISTANCE IN STEELS: ROLE OF CRACK TIP SHIELDING IN DUPLEX MICROSTRUCTURES
作者： Jian Ku Shang , R.O. Ritchie
DOI: 10.1016/B978-0-08-034912-1.50069-2
关键词: Microstructure 、 Crack growth resistance curve 、 Paris' law 、 Crack closure 、 Materials science 、 Composite material 、 Electromagnetic shielding 、 Fatigue crack propagation 、 Metallic alloy 、 Structural engineering 、 Deflection (engineering)
摘要: ABSTRACT The role of crack tip shielding in retarding fatigue growth has been examined duplex microstructures, with the objective achieving maximum resistance to fatigue. Specifically, ferritic-martensitic structures have developed AISI 1008 steel, where is generated from deflection and resultant closure. Such techniques yield thresholds which are 100% higher than normalized structures, i.e., over 20 MPam, representing highest reported for a metallic alloy date. Effects dual-phase microstructures on initiation small (10 1000 μm) quite different. Structures show long lowest growth, characteristic behavior influenced by mutual competition intrinsic extrinsic (shielding) “toughening” mechanisms.
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