Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 488, Issue 1-2, Pages 554-561Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.11.048
Keywords
post-processing annealing; hyper-eutectoid steel wire; fatigue resistance; residual stress; surface defect
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Funding
- KISWIRE RD Center
- NCRC and BK21
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In this study, the effects of annealing at a low temperature on the bending fatigue resistance have been investigated in the hyper-eutectoid steel wires drawn to an extreme strain of 4.12. The annealing temperature was varied from 100 to 500 degrees C. The bending fatigue resistance of the steel wires was measured by a Hunter rotating beam tester specially designed for thin-sized steel wires. The results showed that fatigue resistance as well as tensile strength improved as the annealing temperature increased up to 200 degrees C (Region 1) and gradually decreased after annealing above 200 degrees C (Region II). In order to elucidate this behavior, residual stress was measured by dual beam FIB, surface defects observed by an optical 3D profiler and the microstructure in terms of lamellar spacing (lambda(p)) and cementite thickness (t(e)) was observed by TEM. (C) 2007 Elsevier B.V. All rights reserved.
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