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Effects of prestrain on high temperature impact properties of 304L stainless steel

Published online by Cambridge University Press:  31 January 2011

Woei-Shyan Lee ,
Chi-Feng Lin ,
Tao-Hsing Chen  and
Meng-Chieh Yang
Woei-Shyan Lee*
Affiliation:
Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan
Chi-Feng Lin
Affiliation:
National Center for High-Performance Computing, Hsin-Shi Tainan County 744, Taiwan
Tao-Hsing Chen
Affiliation:
Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan
Meng-Chieh Yang
Affiliation:
Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effects of prestrain, strain rate, and temperature on the impact properties of 304L stainless steel are investigated using a compressive split-Hopkinson pressure bar. The impact tests are performed at strain rates ranging from 2000 to 6000 s−1 and temperatures of 300, 500, and 800 °C using 304L specimens with prestrains of 0.15 or 0.5. The results show that the flow stress, work-hardening rate, and strain rate sensitivity increase with increasing strain rate or decreasing temperature. As the prestrain increases, the flow stress and strain rate sensitivity increase, but the work-hardening rate decreases. The temperature sensitivity increases with an increasing strain rate, temperature, and prestrain. Overall, the effects of prestrain on the impact properties of the tested specimens dominate those of the strain rate or temperature, respectively. Finally, optical microscopy observations reveal that the specimens fracture primarily as the result of the formation of adiabatic shear bands.

Keywords

FractureScanning electron microscopy (SEM)Stress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 4 , April 2010 , pp. 754 - 763
Copyright
Copyright © Materials Research Society 2010

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