TY - JOUR
T1 - Influence of nanotwins on hydrogen embrittlement of TWIP (twinning-induced plasticity) steel processed by high-pressure torsion
AU - Mohammadi, Abbas
AU - Edalati, Kaveh
AU - Coimbrão, Diego Davi
AU - Botta, Walter José
AU - Noguchi, Hiroshi
N1 - Funding Information:
The authors thank Dr. Yongpeng Tang and Prof. Zenji Horita of Kyushu University for supporting the tensile tests. This work is supported in part by grants-in-aid for scientific research from the MEXT, Japan (No. 16H04539 and 19H05176 ), and in part by the Brazilian agencies FAPESP (No. 2019-09816-0 ), CNPq and CAPES . Electron microscopy was conducted in the Laboratory of Structural Characterization (LCE/DEMa/UFSCar), Brazil.
Funding Information:
The authors thank Dr. Yongpeng Tang and Prof. Zenji Horita of Kyushu University for supporting the tensile tests. This work is supported in part by grants-in-aid for scientific research from the MEXT, Japan (No. 16H04539 and 19H05176), and in part by the Brazilian agencies FAPESP (No. 2019-09816-0), CNPq and CAPES. Electron microscopy was conducted in the Laboratory of Structural Characterization (LCE/DEMa/UFSCar), Brazil.
Publisher Copyright:
© 2020 Elsevier B.V.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/5/5
Y1 - 2020/5/5
N2 - Recent studies suggested that nanotwinned metallic materials can exhibit a good combination of high strength and high ductility. However, few studies examined the strength and ductility of nanotwinned alloys under hydrogen atmosphere. In this study, nanotwins are introduced in a TWIP (twinning-induced plasticity) steel by application of high-pressure torsion (HPT) followed by annealing. The nanotwinned austenitic TWIP steel exhibited a high tensile strength as ~1.4 GPa but without ductility after hydrogen charging. Unlike nanotwinned alloy, the HPT-processed sample, which experienced a phase transformation to a bimodal martensitic structure, exhibited both high strength (~1.6 GPa) and high uniform ductility (6%) after hydrogen charging. It was concluded that twin boundaries act mainly as crack initiation sites and propagation paths but not as effective barriers for dislocation accumulation to enhance the ductility of the TWIP steels under hydrogen atmosphere.
AB - Recent studies suggested that nanotwinned metallic materials can exhibit a good combination of high strength and high ductility. However, few studies examined the strength and ductility of nanotwinned alloys under hydrogen atmosphere. In this study, nanotwins are introduced in a TWIP (twinning-induced plasticity) steel by application of high-pressure torsion (HPT) followed by annealing. The nanotwinned austenitic TWIP steel exhibited a high tensile strength as ~1.4 GPa but without ductility after hydrogen charging. Unlike nanotwinned alloy, the HPT-processed sample, which experienced a phase transformation to a bimodal martensitic structure, exhibited both high strength (~1.6 GPa) and high uniform ductility (6%) after hydrogen charging. It was concluded that twin boundaries act mainly as crack initiation sites and propagation paths but not as effective barriers for dislocation accumulation to enhance the ductility of the TWIP steels under hydrogen atmosphere.
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U2 - 10.1016/j.msea.2020.139273
DO - 10.1016/j.msea.2020.139273
M3 - Article
AN - SCOPUS:85082852751
SN - 0921-5093
VL - 783
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
M1 - 139273
ER -