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Short fatigue crack growth behaviour in ferrite-bainite dual-phase steels

DSpace at IIT Bombay

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Title Short fatigue crack growth behaviour in ferrite-bainite dual-phase steels
 
Creator KUMAR, A
SINGH, SB
RAY, KK
 
Subject mechanical-properties
carbon-steel
microstructure
propagation
morphology
martensite
alloys
short crack
dual-phase steel
bainite
fatigue threshold
crack path
tensile strength
 
Description The influence of bainite content on the short crack growth behaviour has been examined in a series of ferrite-bainite dual phase steels containing 50.3-90.3% bainite. Fatigue tests have been carried out using an earlier reported specimen configuration with the help of a rotating bending machine. These tests have been supplemented by characterization of the generated microstructures, determination of their hardness and tensile properties, and examinations of the nature of association of fatigue crack paths with microstructural constituents. The characteristic critical crack lengths above which linear elastic fracture mechanics may be applicable, the fatigue threshold values at the transition of short to long cracks, and the influence of microstructure on the crack path have been discussed. The maximum value of short crack fatigue threshold indicates a marginally increasing trend with increased amount of bainite. The fatigue crack path is found to be predominantly intra-granular for steels containing < 70% bainite while it is predominantly inter-granular for steels containing > 70% bainite.
 
Publisher IRON STEEL INST JAPAN KEIDANREN KAIKAN
 
Date 2011-08-04T06:30:14Z
2011-12-26T12:54:35Z
2011-12-27T05:42:40Z
2011-08-04T06:30:14Z
2011-12-26T12:54:35Z
2011-12-27T05:42:40Z
2008
 
Type Article
 
Identifier ISIJ INTERNATIONAL, 48(9), 1285-1292
0915-1559
http://dx.doi.org/10.2355/isijinternational.48.1285
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9271
http://hdl.handle.net/10054/9271
 
Language en