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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
 
Creator RAYKAR, NR
RAMAN, RKS
MAITI, SK
CHOUDHARY, L
 
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
 
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.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-10-15T11:48:01Z
2014-10-15T11:48:01Z
2012
 
Type Article
 
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
 
Language en