The occurrence of room-temperature creep in cracked 304 stainless steel specimens and its effect on crack growth behavior

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 483; pp. 572 - 575
• Main Authors: Zhao, Jie, Mo, Tao, Nie, Defu
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.06.2008; Elsevier
• Subjects: Applied sciences; Crack closure; Crack growth; Creep; Exact sciences and technology; Fractures; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Retardation effect; Room-temperature creep; Stainless steel; Room-temperature creep; Stainless steel; Retardation effect; Crack growth; Crack closure; Creep; Crack closure effect; Fatigue crack; Crack propagation; Time dependence; Stress intensity factor; Stainless steel-304; Crack tip
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2006.09.151

With the improvement of measurement accuracy, room-temperature creep has been observed in many metallic materials. In the present paper, a SUS304 stainless steel is selected to investigate room-temperature creep at a crack tip and its influence on subsequent fatigue crack growth. Time-dependent deformation at crack tips under constant stress intensity factor was detected at room temperature. The creep deformation is found to increase with increasing overload ratio and constant stress intensity factor. Loading conditions, such as unloading and/or reloading have a significant influence on the deformation. Compared to single wave overload, room-temperature creep under the same overload ratio produces more retardation on subsequent fatigue crack growth behavior. It is shown that crack closure plays a dominant role in this retardation effect.