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Published in: Strength of Materials 3/2023

21-07-2023

The Ductile-Brittle Transition Mechanism of 15MnTi Steel Under Dynamic Loading

Authors: Y. L. Li, D. Yao, Z. W. Liu, J. C. Luo, H. W. Qiao, L. Sun, X. S. Jiang, P. Z. Li

Published in: Strength of Materials | Issue 3/2023

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Abstract

This work studied the ductile-brittle transition process of 15MnTi steel under different dynamic loading conditions. The strength of 15MnTi steel increased with strain rate because dislocation movement and element diffusion were inhibited. The fracture mode was different under different loading speeds. When the loading speed was lower than 0.025 m/s, the fracture mode was complete ductile fracture; when the loading speed was 0.1 –0.4 m/s, the fracture mode was ductile-brittle fracture; and when the loading speed was higher than 0.5 m/s, the fracture mode was a brittle fracture. In the three-point bending test, the dynamic brittle fracture rate of 15MnTi steel decreased with increasing crack tip constraint, and the brittle fracture resistance decreased with increasing loading rate. In the Charpy impact test, the fracture mode of the prefabricated crack specimens was a ductile fracture. In addition, when the loading rate was 0.1 m/s, the toughness characteristics were not obvious. The fracture had tear dimples at loading rates ranging from 1 to 3.5 m/s, showing certain ductile fracture characteristics. There were many dislocations in the matrix, and TiC was distributed in the matrix. Plenty of dislocations accumulated around the particles, which improved the strength by hindering the movement of the dislocations.

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Literature
11.
go back to reference D. Z. Li, Y. H. Wei, C.Y. Liu, et al., “Effects of high strain rate on properties and microstructure evolution of twip steel subjected to impact loading,” J Iron Steel Res Int, 17, No. 6, 67–73 (2010). http://doi.org/https://doi.org/10.1016/S1006-706X (10)60116-1CrossRef D. Z. Li, Y. H. Wei, C.Y. Liu, et al., “Effects of high strain rate on properties and microstructure evolution of twip steel subjected to impact loading,” J Iron Steel Res Int, 17, No. 6, 67–73 (2010). http://​doi.​org/​https://​doi.​org/​10.​1016/​S1006-706X (10)60116-1CrossRef
Metadata
Title
The Ductile-Brittle Transition Mechanism of 15MnTi Steel Under Dynamic Loading
Authors
Y. L. Li
D. Yao
Z. W. Liu
J. C. Luo
H. W. Qiao
L. Sun
X. S. Jiang
P. Z. Li
Publication date
21-07-2023
Publisher
Springer US
Published in
Strength of Materials / Issue 3/2023
Print ISSN: 0039-2316
Electronic ISSN: 1573-9325
DOI
https://doi.org/10.1007/s11223-023-00556-x

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