| ZHANG Tao,WANG Chang-peng,LIU Jing.Hydrogen Induced Cracking Behavior of X80 Pipeline Steel in Acidic Environment in China[J],43(6):48-52 |
| Hydrogen Induced Cracking Behavior of X80 Pipeline Steel in Acidic Environment in China |
| Received:July 15, 2014 Revised:December 10, 2014 |
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| DOI： |
| KeyWord:X80 pipeline steel hydrogen induced cracking acidic environment |
| Author | Institution |
| ZHANG Tao |
1. Southwest Technology and Engineering Research Institute, Chongqing , China;2. Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing , China |
| WANG Chang-peng |
1. Southwest Technology and Engineering Research Institute, Chongqing , China;2. Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing , China |
| LIU Jing |
1. Southwest Technology and Engineering Research Institute, Chongqing , China;2. Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing , China |
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| Abstract: |
| Objective To investigate the hydrogen induced cracking (HIC) behavior of X80 pipeline steel in the typical acidic environment (simulated solutions of the acidic soil in Yingtan). Methods Using the potentiodynamic polarization curves, slow strain rate test (SSRT) and SEM technology, the behavior of hydrogen permeation, the behavior of hydrogen release, the influence of tensile properties after hydrogen charging and the fracture morphology were analyzed. Results According to the result of hydrogen permeation test, the hydrogen diffusion flux at room temperature was 7. 31×10-11 mol/ (cm2·s), the effective diffusivity of hydrogen was 5. 36×10-8 cm2 / s and the diffusible hydrogen concentration was 7. 64×10-5 mol/ cm3. Moreover, the alumina nonmetallic inclusions and surface pitting promoted the initiation hydrogen induced crack, and the failure mode was transgranular cracking after hydrogen charging. With the increase of hydrogen charging time, the fracture morphology changed from ductile fracture to brittle fracture, and the sensitivity to HIC increased. Conclusion X80 pipeline steel had high sensitivity to HIC in the typical acidic environment (simulated solutions of the acidic soil in Yingtan). |
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