Record Details

EFFECT OF HYDROGEN ON FRACTURE OF AUSTENITIC FE-MN-AL STEEL

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Title EFFECT OF HYDROGEN ON FRACTURE OF AUSTENITIC FE-MN-AL STEEL
 
Creator MITTAL, SC
PRASAD, RC
DESHMUKH, MB
 
Subject ductile fracture
embrittlement
cracking
alloys
hydrogen embrittlement
austenitic fe-mn-al steel
fracture behavior
 
Description In this investigation a stable high manganese austenitic steel, 0.45C-17Mn-2.8Al, has been studied for hydrogen embrittlement using cathodically precharged specimens. Tensile testing of axisymmetric and plane strain specimens precharged with hydrogen show an appreciable loss of 8-10% reduction in area (RA) whereas the loss in % elongation is lesser. The true fracture strain decreased from 0.88 to 0.73 for axisymmetric and from 0.79 to 0.60 for plane strain specimens. Hydrogen precharging is observed to result in decrease of CTOD at crack initiation by about 0.07 mm and a decrease in crack tip fracture strain for crack initiation from 0.53 to 0.34. The greater effect of hydrogen precharging thus observed is attributed to existence of higher stress triaxiality in CTOD and plane strain tensile testing in comparison to axisymmetric one. On SEM examination of fracture surfaces the uncharged tensile specimens showed only dimpled fracture, the precharged specimens showed transition from dimpled to quasicleavage and intergranular fracture near the surface. Regions close to the pre-fatigue tip in CTOD specimens depict intergranular fracture. The fractographic changes are attributed to the combined role of stress intensity and hydrogen concentration variation arising out of hydrogen transport inside the specimen.
 
Publisher IRON STEEL INST JAPAN KEIDANREN KAIKAN
 
Date 2011-08-04T05:15:47Z
2011-12-26T12:54:34Z
2011-12-27T05:42:37Z
2011-08-04T05:15:47Z
2011-12-26T12:54:34Z
2011-12-27T05:42:37Z
1994
 
Type Article
 
Identifier ISIJ INTERNATIONAL, 34(2), 211-216
0915-1559
http://dx.doi.org/10.2355/isijinternational.34.211
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9256
http://hdl.handle.net/10054/9256
 
Language en