Effect of Microstructure on Hydrogen Permeation in EA4T and 30CrNiMoV12 Railway Axle Steels
A comparative study was conducted to reveal the effect of microstructure on hydrogen permeation in the EA4T and 30CrNiMoV12 railway axle steels. Unlike the EA4T with its sorbite structure, 30CrNiMoV12 steel shows a typical tempered martensitic structure, in which a large number of fine, short, rod-l...
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MDPI AG
2019-02-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/9/2/164 |
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doaj-77c5906cd1b347fa94f2058ee52d2a962020-11-25T01:06:41ZengMDPI AGMetals2075-47012019-02-019216410.3390/met9020164met9020164Effect of Microstructure on Hydrogen Permeation in EA4T and 30CrNiMoV12 Railway Axle SteelsTingzhi Si0Yunpeng Liu1Qingan Zhang2Dongming Liu3Yongtao Li4School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaSchool of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, ChinaA comparative study was conducted to reveal the effect of microstructure on hydrogen permeation in the EA4T and 30CrNiMoV12 railway axle steels. Unlike the EA4T with its sorbite structure, 30CrNiMoV12 steel shows a typical tempered martensitic structure, in which a large number of fine, short, rod-like, and spherical carbides are uniformly dispersed at boundaries and inside laths. More importantly, this structure possesses plentifully strong hydrogen traps, such as nanosized Cr<sub>7</sub>C<sub>3</sub>, Mo<sub>2</sub>C, VC, and V<sub>4</sub>C<sub>3</sub>, thus resulting in a high density of trapping sites (<i>N</i> = 1.17 × 10<sup>22</sup> cm<sup>−3</sup>). The hydrogen permeation experiments further demonstrated that, compared to EA4T, the 30CrNiMoV12 steel not only delivered minimally effective hydrogen diffusivity but also had a high hydrogen concentration. The activation energy for hydrogen diffusion of the 30CrNiMoV12 steel was greatly increased from 23.27 ± 1.94 of EA4T to 47.82 ± 2.14 kJ mol<sup>−1</sup>.https://www.mdpi.com/2075-4701/9/2/164railway axle steelhydrogen permeationhydrogen diffusioncarbideshydrogen trapping |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Tingzhi Si Yunpeng Liu Qingan Zhang Dongming Liu Yongtao Li |
| spellingShingle |
Tingzhi Si Yunpeng Liu Qingan Zhang Dongming Liu Yongtao Li Effect of Microstructure on Hydrogen Permeation in EA4T and 30CrNiMoV12 Railway Axle Steels Metals railway axle steel hydrogen permeation hydrogen diffusion carbides hydrogen trapping |
| author_facet |
Tingzhi Si Yunpeng Liu Qingan Zhang Dongming Liu Yongtao Li |
| author_sort |
Tingzhi Si |
| title |
Effect of Microstructure on Hydrogen Permeation in EA4T and 30CrNiMoV12 Railway Axle Steels |
| title_short |
Effect of Microstructure on Hydrogen Permeation in EA4T and 30CrNiMoV12 Railway Axle Steels |
| title_full |
Effect of Microstructure on Hydrogen Permeation in EA4T and 30CrNiMoV12 Railway Axle Steels |
| title_fullStr |
Effect of Microstructure on Hydrogen Permeation in EA4T and 30CrNiMoV12 Railway Axle Steels |
| title_full_unstemmed |
Effect of Microstructure on Hydrogen Permeation in EA4T and 30CrNiMoV12 Railway Axle Steels |
| title_sort |
effect of microstructure on hydrogen permeation in ea4t and 30crnimov12 railway axle steels |
| publisher |
MDPI AG |
| series |
Metals |
| issn |
2075-4701 |
| publishDate |
2019-02-01 |
| description |
A comparative study was conducted to reveal the effect of microstructure on hydrogen permeation in the EA4T and 30CrNiMoV12 railway axle steels. Unlike the EA4T with its sorbite structure, 30CrNiMoV12 steel shows a typical tempered martensitic structure, in which a large number of fine, short, rod-like, and spherical carbides are uniformly dispersed at boundaries and inside laths. More importantly, this structure possesses plentifully strong hydrogen traps, such as nanosized Cr<sub>7</sub>C<sub>3</sub>, Mo<sub>2</sub>C, VC, and V<sub>4</sub>C<sub>3</sub>, thus resulting in a high density of trapping sites (<i>N</i> = 1.17 × 10<sup>22</sup> cm<sup>−3</sup>). The hydrogen permeation experiments further demonstrated that, compared to EA4T, the 30CrNiMoV12 steel not only delivered minimally effective hydrogen diffusivity but also had a high hydrogen concentration. The activation energy for hydrogen diffusion of the 30CrNiMoV12 steel was greatly increased from 23.27 ± 1.94 of EA4T to 47.82 ± 2.14 kJ mol<sup>−1</sup>. |
| topic |
railway axle steel hydrogen permeation hydrogen diffusion carbides hydrogen trapping |
| url |
https://www.mdpi.com/2075-4701/9/2/164 |
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