On the plasticity mechanisms of lath martensitic steel
- Authors
- Jo, Kyoung-Rae; Seo, Eun-Jung; Sulistiyo, Dimas Hand; Kim, Jin-Kyung; Kim, Seong-Woo; De Cooman, Bruno C.
- Issue Date
- Sep-2017
- Publisher
- Elsevier BV
- Keywords
- Press hardening steel; Plastic deformation; Strain rate sensitivity; Martensite; Stress relaxation test
- Citation
- Materials Science and Engineering: A, v.704, pp.252 - 261
- Indexed
- SCIE
SCOPUS
- Journal Title
- Materials Science and Engineering: A
- Volume
- 704
- Start Page
- 252
- End Page
- 261
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/8965
- DOI
- 10.1016/j.msea.2017.08.024
- ISSN
- 0921-5093
- Abstract
- The plasticity mechanisms of press hardening steel with a fully lath martensite microstructure were examined experimentally by strain rate sensitivity measurements, repeated relaxation tests and internal friction measurements. The analysis of relaxation tests suggests that the micro-plasticity could be due to the motion of mobile non-screw dislocations, based on mobile dislocation exhaustion observed in the micro-plastic range. In the macro-plastic range, the plasticity is thought to be due to the generation of mobile screw dislocations. The solute carbon-dislocation interaction results in a negative strain rate sensitivity and a Snoek-Koster-Ke peak in the internal friction spectrum of the lath martensitic press hardening steel. The magnitude of the effective activation volume and its stress dependence indicate that plastic deformation is most likely controlled by screw dislocation motion by formation and lateral movement of kink pairs dragging solute carbon atom atmospheres. Both isotropic and kinematical hardening seem to play a role in the strain hardening behavior of lath martensitic steel.
- Files in This Item
-
Go to Link
- Appears in
Collections - COLLEGE OF ENGINEERING SCIENCES > DEPARTMENT OF MATERIALS SCIENCE AND CHEMICAL ENGINEERING > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.