Investigation of the effect of electrolytic hydrogen charging on tensile-ductility loss in different Al-added low density steels

The presentation investigated the hydrogen embrittlement of a Fe-8.3Mn- (9.5, 12) Al–1C (wt.%) low density steel, focusing on the influence of electrolytic hydrogen charging on tensile-ductility loss. We performed a tensile test after hydrogen charging at a low strain rate (9.5 × 10−6 s−1) to observ...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2020-09, Vol.795, p.140027, Article 140027
Main Authors: Zhang, Xiao-Feng, Kan, Zhong-Wei, Yang, Yong, Wan, Ya-Xiong, Li, Jia-Xing, Huang, Zhen-Yi
Format: Article
Language:English
Subjects:
Ductile fracture
Ductility
Ductility loss
Ductility tests
Elongation
Environmentally assisted cracking
Fracture surfaces
Grain boundaries
Hydrogen
Hydrogen charging
Hydrogen embrittlement
Intergranular fracture
Low density materials
Low density steel
Slow strain rate test
Steel
Strain rate
Tensile strength
Tensile tests
Thermal desorption spectroscopy
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Summary:The presentation investigated the hydrogen embrittlement of a Fe-8.3Mn- (9.5, 12) Al–1C (wt.%) low density steel, focusing on the influence of electrolytic hydrogen charging on tensile-ductility loss. We performed a tensile test after hydrogen charging at a low strain rate (9.5 × 10−6 s−1) to observe hydrogen-assisted cracking. The concentration of hydrogen was measured by thermal desorption spectroscopy and the fracture surface was evaluated by scanning electron microscope. Tensile test results have shown that the strength and elongation of the two kinds of steel after hydrogen charging both reduced, especially the elongation loss was more significant. For 12Al steel, the maximum tensile strength and elongation loss values were 74.22%, 67.73%, respectively. While for 9.5Al steel, the strength loss value was relatively small, the maximum loss value was 8.36%, and it reduced the maximum elongation loss of 26.02%. For the existence of κappa carbides and annealing twins in the tested steel, hydrogen preferentially concentrated on the grain boundaries and twins, leading to intergranular cracking, and the fracture mode changed from ductile fracture to quasi-cleavage fracture.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2020.140027