Fracture behavior of laser-clad joint of Stellite 21 on AISI 316L stainless steel

Present paper describes microstructural and mechanical characterization of laser-clad composite joint made of Stellite 21 and type 316L stainless steel (SS). The study has been broadly performed on two kinds of laser-clad specimens viz. (i) involving direct deposition of Stellite 21 on SS and (ii) i...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2010, Vol.527 (16), p.3748-3756
Main Authors: Ganesh, P., Moitra, A., Tiwari, Pragya, Sathyanarayanan, S., Kumar, Harish, Rai, S.K., Kaul, Rakesh, Paul, C.P., Prasad, R.C., Kukreja, L.M.
Format: Article
Language:English
Subjects:
Applied sciences
Clad interface
Exact sciences and technology
Fatigue
Fractures
Graded cladding
Impact test
Laser cladding
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metallic coatings
Metals. Metallurgy
Production techniques
Stainless steel
Stellite
Surface treatment
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Summary:Present paper describes microstructural and mechanical characterization of laser-clad composite joint made of Stellite 21 and type 316L stainless steel (SS). The study has been broadly performed on two kinds of laser-clad specimens viz. (i) involving direct deposition of Stellite 21 on SS and (ii) involving gradient in chemical composition across substrate/clad interface. Both kinds of specimens exhibited nearly similar tensile strength, which was higher than that of SS in the interface region. Inter-dendritic carbides provided low energy fracture path in laser-clad deposits of Stellite 21. Both direct and graded interfaces of laser-clad specimens exhibited superior fatigue strength than the SS substrate. Instrumented impact testing brought out distinct difference in the mode of crack propagation across direct and the graded clad specimens. In contrast to initiation-controlled brittle crack propagation across the interface region in “direct clad” specimens, crack propagation across “graded interface” was marked with significant plastic deformation.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2010.03.017