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On the plasticity mechanisms of lath martensitic steel

Title
On the plasticity mechanisms of lath martensitic steel
Author
김진경
Keywords
Press hardening steel; Plastic deformation; Strain rate sensitivity; Martensite; Stress relaxation test
Issue Date
2017-09
Publisher
ELSEVIER SCIENCE SA
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 704, Page. 252-261
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.
URI
https://www.sciencedirect.com/science/article/pii/S0921509317310304https://repository.hanyang.ac.kr/handle/20.500.11754/99238
ISSN
0921-5093; 1873-4936
DOI
10.1016/j.msea.2017.08.024
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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