Investigation of hydrogen assisted cracking of a high strength steel using circumferentially notched tensile test
DSpace at IIT Bombay
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Title |
Investigation of hydrogen assisted cracking of a high strength steel using circumferentially notched tensile test
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Creator |
RAYKAR, NR
RAMAN, RKS MAITI, SK CHOUDHARY, L |
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Subject |
Hydrogen assisted stress corrosion cracking
Circumferentially notched tensile test Corrosion tests of high strength steel STRESS-CORROSION CRACKING K-ISCC CYLINDRICAL SPECIMENS FRACTURE-TOUGHNESS GROWTH RATE CAST-IRON THRESHOLD SUSCEPTIBILITY EMBRITTLEMENT VALIDITY |
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Description |
The novel circumferentially notched tensile (CNT) test technique is used for the first time for an investigation of hydrogen assisted stress corrosion cracking. Effect of hydrogen on the fracture strength of high strength steel AS-4340 is examined in neutral 3.5% NaCl solution at room temperature and under hydrogen supply from within the material and/or external environment. A progressive drop in the stress intensity factor at the fracture was observed as a result of: (a) increasing span of hydrogen pre-charging (hence increasing internal hydrogen) and (b) decreasing rate of loading (hence increasing external supply of hydrogen). The measured critical stress intensity factors corresponding to varying degrees of supply of internal hydrogen are consistent with the computed hydrogen concentrations ahead of the crack tip. The experimentally determined threshold for hydrogen embrittlement in the regime of slower loading rates are consistent with the published data. The results presented here establish the usefulness of the CNT test technique for the investigation of HASCC in high strength steel over a wider range of loading rate. (C) 2012 Elsevier B.V. All rights reserved.
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Publisher |
ELSEVIER SCIENCE SA
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Date |
2014-10-15T11:48:01Z
2014-10-15T11:48:01Z 2012 |
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Type |
Article
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Identifier |
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 54786-92
http://dx.doi.org/10.1016/j.msea.2012.03.086 http://dspace.library.iitb.ac.in/jspui/handle/100/14826 |
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Language |
en
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