Dynamic Mechanical Response of Biomedical 316L Stainless Steel as Function of Strain Rate and Temperature. (20th December 2011)

• Record Type: Journal Article
• Authors: Lee, Woei-Shyan; Chen, Tao-Hsing; Lin, Chi-Feng; Luo, Wen-Zhen
• Other Names: López Concepción Academic Editor.
• Is Part Of: Bioinorganic chemistry and applications. Volume 2011(2011)
• Publication Date: 2011-12-20
• Subjects: Bioinorganic chemistry -- Periodicals; Bioinorganic chemistry; Biochemistry; Inorganic Chemistry; Chemistry, Bioinorganic; Periodicals; 572.51
• DOI: 10.1155/2011/173782
• Languages: English
• ISSNs: 1565-3633

Abstract

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 × 10 3 s −1 to 5 × 10 3 s −1 and temperatures between25 ∘ C and800 ∘ 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 × 10 3 s −1 and temperatures of25 ∘ C or200 ∘ 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 of800 ∘ C .