| YIN Hang,LI Qian,LI Jin-xu,ZHANG Zhi,YAN Yu,SU Yan-jing.Study on Hydrogen Embrittlement for Pre-charged Maraging Steel[J],45(7):22-29 |
| Study on Hydrogen Embrittlement for Pre-charged Maraging Steel |
| Received:March 12, 2016 Revised:July 20, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.07.004 |
| KeyWord:precharged hydrogen maraging steel slow strain rate stretching hydrogen embrittlement hydrogen diffusion coefficient intergranular crack |
| Author | Institution |
| YIN Hang |
Key Laboratory of the Ministry of Education MOE for Environmental Fracture, Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
| LI Qian |
Key Laboratory of the Ministry of Education MOE for Environmental Fracture, Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
| LI Jin-xu |
Key Laboratory of the Ministry of Education MOE for Environmental Fracture, Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
| ZHANG Zhi |
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu , China |
| YAN Yu |
Key Laboratory of the Ministry of Education MOE for Environmental Fracture, Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
| SU Yan-jing |
Key Laboratory of the Ministry of Education MOE for Environmental Fracture, Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
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| Abstract: |
| Objective To study the effect of pre-existed hydrogen in specimen on the mechanical properties. Methods For a type of solution-treated and three types of heat-treated 18Ni maraging steels, electrochemical permeation was employed to determine effective hydrogen diffusion coefficient (Deff); thermal desorption analysis (TDA) was carried out to assess activity energies (Ea); slow strain rate tensile tests were performed to characterize the mechanical properties and further evaluate the hydrogen embrittlement (HE) susceptibility of pre-charged and cadmium coated specimens in comparison of uncharged specimens. Results The results showed that Deff of the solution-treated specimen was 1.40×10?8 cm2/s, which was the largest among four specimens. Deff of three heat-treated specimens gradually decreased with the rise of aging temperature, which were 6.23×10?9 cm2/s for 465 ℃, 5.52×10?9 cm2/s for 490 ℃ and 2.84×10?9 cm2/s for 530 ℃ respectively; whereas, Ea gradually rose. Four specimens all exhibited HE susceptibility, which increased with the rise of charging current density. The HE susceptibility indexes for T465 and T490 were both higher than 58%, while that for T530 was smaller than 40%. In the fracture morphology of the four specimens, cracks initiated from the centre and radiated to surrounding. Centre crack source was a typical intergranular feature, while the extension area was quasi-cleavage cracking. Conclusion The hydrogen embrittlement of overaging samples is the best. The pre-existed hydrogen in the sample gathers in the center during tensile test, which causes intergranular crack in the center and reverse to dynamic hydrogen charging tensile fracture. |
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