| CHEN Lian-sheng,ZHANG Lei-yu,YANG Zi-xuan,TIAN Ya-qiang,CANG Sheng.Effect of Micro-alloying Element Cu and Isothermal Temperature on Hydrogen Diffusion Behavior of Low Carbon Si-Mn Steel[J],49(8):45-54 |
| Effect of Micro-alloying Element Cu and Isothermal Temperature on Hydrogen Diffusion Behavior of Low Carbon Si-Mn Steel |
| Received:July 17, 2020 Revised:August 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.08.006 |
| KeyWord:IQ&P; RA hydrogen hydrogen trap hydrogen diffusion coefficient low carbon silico-manganese steel Cu |
| Author | Institution |
| CHEN Lian-sheng |
1.Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan , China |
| ZHANG Lei-yu |
1.Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan , China |
| YANG Zi-xuan |
2.Key Laboratory of Impact and Safety Engineering, Ministry of Education of China, Ningbo University, Ningbo , China |
| TIAN Ya-qiang |
1.Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan , China |
| CANG Sheng |
2.Key Laboratory of Impact and Safety Engineering, Ministry of Education of China, Ningbo University, Ningbo , China |
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| Abstract: |
| The work aims to explore the effects of micro-alloys and heat treatment processes on hydrogen diffusion. Two kinds of low alloy steels containing 0.4% Cu and without Cu were designed. The test steels with isothermal temperature of 280 ℃ and 400 ℃ were obtained after IQ&P process. The behavior of hydrogen diffusion was analyzed by SEM, EBSD and electrochemical hydrogen permeation techniques. For steel without Cu, when the isothermal temperature was 280 ℃, the large angle grain boundary accounted for 55%, the volume content of residual austenite (RA) was about 0.02%, and the hydrogen diffusion coefficient was 1.82×10-7 cm2/s. When the isothermal temperature was 400 ℃, the large angle grain boundary accounted for 51%, the volume content of RA was about 0.35%, and the hydrogen diffusion coefficient was 1.30×10-7 cm2/s. For steel with 0.4% Cu, when the isothermal temperature was 280 ℃, the large angle grain boundary accounted for 46%, the volume content of RA was 0.15%, and the hydrogen diffusion coefficient was 2.70×10-7 cm2/s. When the isothermal temperature was 400 ℃, the large angle grain boundary accounted for 33%, the volume content of RA was about 3.00% and the hydrogen diffusion coefficient was about 0.40×10-7 cm2/s. Therefore, Cu leads to the refinement of grain size, lower proportion of high angle grain boundary and higher RA content, resulting in lower hydrogen diffusion coefficient, which is not conducive to the occurrence of hydrogen diffusion behavior. When the isothermal temperature increases from 280 ℃ to 400 ℃, the grain coarsening occurs, but the hydrogen diffusion coefficient is also reduced due to the lower proportion of high angle grain boundary and higher RA content, which is not conducive to the occurrence of hydrogen diffusion behavior. Therefore, the hydrogen diffusion ability of (IQ&P) steel with 0.4% Cu and 400 ℃ isothermal temperature is the worst. |
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