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Bioinorg Chem Appl. 2011; 2011: 173782.
Published online Dec 20, 2011. doi:  10.1155/2011/173782
PMCID: PMC3246303
Dynamic Mechanical Response of Biomedical 316L Stainless Steel as Function of Strain Rate and Temperature
Woei-Shyan Lee, 1 * Tao-Hsing Chen, 2 Chi-Feng Lin, 3 and Wen-Zhen Luo 1
1Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan
2Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan
3National Center for High-Performance Computing, Hsin-Shi Tainan 744, Taiwan
*Woei-Shyan Lee: wslee/at/mail.ncku.edu.tw
Academic Editor: Concepción López
Received June 30, 2011; Revised September 19, 2011; Accepted September 19, 2011.
Abstract
A split Hopkinson pressure bar is used to investigate the dynamic mechanical properties of biomedical 316L stainless steel under strain rates ranging from 1 × 103 s−1 to 5 × 103 s−1 and temperatures between 25°C and 800°C. The results indicate that the flow stress, work-hardening rate, strain rate sensitivity, and thermal activation energy are all significantly dependent on the strain, strain rate, and temperature. For a constant temperature, the flow stress, work-hardening rate, and strain rate sensitivity increase with increasing strain rate, while the thermal activation energy decreases. Catastrophic failure occurs only for the specimens deformed at a strain rate of 5 × 103 s−1 and temperatures of 25°C or 200°C. Scanning electron microscopy observations show that the specimens fracture in a ductile shear mode. Optical microscopy analyses reveal that the number of slip bands within the grains increases with an increasing strain rate. Moreover, a dynamic recrystallisation of the deformed microstructure is observed in the specimens tested at the highest temperature of 800°C.
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