中文版 | English
Title

Strain rate dependence of strengthening mechanisms in ultrahigh strength lath martensite

Author
Corresponding AuthorHe, B.B.; Liang, Z.Y.
Publication Years
2023-02
DOI
Source Title
ISSN
0749-6419
EISSN
1879-2154
Volume161
Abstract
The strain rate dependent mechanical properties of lath martensite are important for developing ultrahigh strength steels for automobile applications. Here, taken 2 GPa grade press hardening steel as a model material, we explored the strain rate sensitivity of lath martensite and the underlying physics. Uniaxial tensile tests were carried out over a wide range of strain rates from 10-3 to 1450 s-1 to determine the rate dependent mechanical properties. Strain rate exerts minor effect on mechanical properties at strain rates below 102 s-1. In contrast, both yield strength and work-hardening rate substantially increase with strain rate during high-strain-rate deformation. Microstructural evolution was characterized using electron backscatter diffraction and transmission electron microscopy. Particularly, synchrotron X-ray diffraction was used to measure dislocation density. The respective strengthening contributions from the friction stress, dislocations and high-angle block boundaries in lath martensite were evaluated on the basis of the measured microstructural parameters as well as related phenomenological models for predicting their strengthening effects. It is found that the enhanced yield strength during high-strain-rate deformation is due to a larger lattice friction for dislocation slip. The higher work-hardening rate is attributed to the enhanced mechanical heterogeneity within the current lath martensite microstructure at higher strain rates, which leads to larger strain gradient and thus promoted generation of geometrically-necessary dislocations.
© 2022 Elsevier Ltd.
Keywords
URL[Source Record]
Indexed By
EI ; SCI
Language
English
SUSTech Authorship
Corresponding
Funding Project
Z.Y. Liang acknowledges the financial supports from National Natural Science Foundation of China (No. 52101146 ) and Guangdong Basic and Applied Basic Research Foundation (No. 2020B1515130007 ). B.B. He acknowledges the financial supports from National Natural Science Foundation of China (No. U52071173 ) and Science and Technology Innovation Commission of Shenzhen (Nos. JCYJ20210324120209026 ; KQTD2019092917250571 ). The authors also acknowledge the experimental support from the BL02U2 beamline at Shanghai Synchrotron Radiation Facility in China and the SUSTech Core Research Facilities.
WOS Research Area
Engineering ; Materials Science ; Mechanics
WOS Subject
Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
WOS Accession No
WOS:000976317800001
Publisher
EI Accession Number
20230713578175
EI Keywords
Friction ; High resolution transmission electron microscopy ; High strength steel ; Martensite ; Strain hardening ; Strengthening (metal) ; Tensile testing ; Yield stress
ESI Classification Code
Metallurgy:531.1 ; Metallography:531.2 ; Heat Treatment Processes:537.1 ; Steel:545.3 ; Optical Devices and Systems:741.3 ; Materials Science:951
ESI Research Field
ENGINEERING
Data Source
EV Compendex
Citation statistics
Cited Times [WOS]:2
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/519802
DepartmentDepartment of Mechanical and Energy Engineering
Affiliation
1.Songshan Lake Materials Laboratory, Dongguan; 523808, China
2.Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen; 518055, China
Corresponding Author AffilicationDepartment of Mechanical and Energy Engineering
Recommended Citation
GB/T 7714
Liu, H.,Shang, X.K.,He, B.B.,et al. Strain rate dependence of strengthening mechanisms in ultrahigh strength lath martensite[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2023,161.
APA
Liu, H.,Shang, X.K.,He, B.B.,&Liang, Z.Y..(2023).Strain rate dependence of strengthening mechanisms in ultrahigh strength lath martensite.INTERNATIONAL JOURNAL OF PLASTICITY,161.
MLA
Liu, H.,et al."Strain rate dependence of strengthening mechanisms in ultrahigh strength lath martensite".INTERNATIONAL JOURNAL OF PLASTICITY 161(2023).
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