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Evaluation of fracture toughness and impact toughness of laser rapid manufactured Inconel-625 structures and their co-relation

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Title Evaluation of fracture toughness and impact toughness of laser rapid manufactured Inconel-625 structures and their co-relation
 
Creator PUPPALA, G
MOITRA, A
SATHYANARAYANAN, S
KAUL, R
SASIKALA, G
PRASAD, RC
KUKREJA, LM
 
Subject Laser rapid manufacturing
Nickel-based superalloy
Fracture toughness
Instrumented impact test
DIRECT METAL-DEPOSITION
CHARPY V-NOTCH
INSTRUMENTED IMPACT
OPERATIONAL CHARACTERISTICS
CW CO2-LASER
SPECIMENS
COMPONENTS
BEHAVIOR
FATIGUE
STEEL
 
Description The present study involves evaluation of fracture toughness and Charpy impact toughness of Inconel 625 structures fabricated by laser based additive manufacturing. The results of crack tip opening displacement (CTOD) fracture toughness are close to those reported for the Inconel 625 weld metal. The nature of the load-time traces of instrumented Charpy impact tests revealed that the alloy Inconel 625 in laser fabricated condition was associated with fully ductile behavior with Charpy V-Notch impact energy in the range of 48-54 J. Stress relieving heat treatment at 950 degrees C for 1 h has resulted in marginal improvement in the impact toughness by about 10%, whereas no clear evidence of such improvement is seen in the CTOD fracture toughness. Fractographic examination of the Charpy specimens and the results of the instrumented impact tests imply that the mechanism of crack growth was propagation controlled under dynamic loading conditions. Dynamic fracture parameters were estimated from the instrumented impact test data and compared with the experimentally evaluated fracture toughness results. (C) 2014 Elsevier Ltd. All rights reserved.
 
Publisher ELSEVIER SCI LTD
 
Date 2014-12-28T16:57:24Z
2014-12-28T16:57:24Z
2014
 
Type Article
 
Identifier MATERIALS & DESIGN, 59509-515
0261-3069
1873-4197
http://dx.doi.org/10.1016/j.matdes.2014.03.013
http://dspace.library.iitb.ac.in/jspui/handle/100/16942
 
Language English