Title | Strain rate dependence of strengthening mechanisms in ultrahigh strength lath martensite |
Author | |
Corresponding Author | He, B.B.; Liang, Z.Y. |
Publication Years | 2023-02
|
DOI | |
Source Title | |
ISSN | 0749-6419
|
EISSN | 1879-2154
|
Volume | 161 |
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 | |
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]:5
|
Document Type | Journal Article |
Identifier | http://kc.sustech.edu.cn/handle/2SGJ60CL/519802 |
Department | Department 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 Affilication | Department 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).
|
Files in This Item: | There are no files associated with this item. |
|
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment