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Fatigue and fracture toughness characteristics of laser rapid manufactured Inconel 625 structures

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Title Fatigue and fracture toughness characteristics of laser rapid manufactured Inconel 625 structures
 
Creator GANESH, P
KAUL, R
PAUL, CP
TIWARI, P
RAI, SK
PRASAD, RC
KUKREJA, LM
 
Subject components
co2-laser
cracking
power
laser rapid manufacturing
inconel 625
fatigue crack growth
fractography
transgranular fracture
j-integral test
 
Description Fatigue crack growth and fracture toughness characteristics of laser rapid manufactured (LRMed) Inconel 625 compact tension specimens of thickness 12 and 25 mm were investigated. Fatigue crack propagation in all the specimens investigated in the stress intensity range (Delta K) of 14-38 MPa root m, exhibited stage II crack growth in Paris' regime with nearly same slopes of crack growth per cycle versus Delta K plot. Fatigue crack growth rates in the LRMed specimens of present study were found to be lower than the reported values for wrought Inconel 625 in the Delta K range of 14-24 MPa root m and above this range they tended to coincide. X-ray diffraction patterns of the fractured surfaces revealed that the crack propagated along the growth direction of the specimens which was predominantly along the (1 1 1) plane. The fracture toughness values (J(0.2)) for LRMed Inconel 625 specimens were found to be in the range of about 200-255 kJ/m(2). The LRMed specimens exhibited stable crack growth during the J-integral test. .
 
Publisher ELSEVIER SCIENCE SA
 
Date 2011-07-27T22:23:27Z
2011-12-26T12:58:34Z
2011-12-27T05:48:45Z
2011-07-27T22:23:27Z
2011-12-26T12:58:34Z
2011-12-27T05:48:45Z
2010
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 527(29-30), 7490-7497
0921-5093
http://dx.doi.org/10.1016/j.msea.2010.08.034
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7341
http://hdl.handle.net/10054/7341
 
Language en