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Brazing Process to Repair Wide Gap Cracks of Inconel 738 Superalloy Components

Published online by Cambridge University Press:  01 February 2011

Isidro Guzmán ,
Alejandro Garza ,
Felipe García  and
Jesús Castillo
Isidro Guzmán
Affiliation:
Dirección de Ingeniería de Materiales y Manufactura, COMIMSA, Saltillo Coahuila C.P. 25290
Alejandro Garza
Affiliation:
Dirección de Ingeniería de Materiales y Manufactura, COMIMSA, Saltillo Coahuila C.P. 25290
Felipe García
Affiliation:
Dirección de Ingeniería de Materiales y Manufactura, COMIMSA, Saltillo Coahuila C.P. 25290
Jesús Castillo
Affiliation:
Dirección de Ingeniería de Materiales y Manufactura, COMIMSA, Saltillo Coahuila C.P. 25290
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Abstract

Brazing process is a cost effective technique to repair wide gap cracks in turbine components made from difficult to weld nickel base superalloys. In this process boron and silicon are used as melting point depressants, however, form hard and brittle intermetallic compounds with nickel (eutectic phases) which are detrimental to the mechanical properties of brazed joints. In this paper the effect of brazing parameters such as temperature and time on final microstructure of brazed joint of nickel base superalloy Inconel 738 using a commercial filler metal alloy (Ni-11Cr-3.5Si-2.25B-3.5Fe) was investigated. The microstructure of the joint layer was characterized by optical and scanning electron microscopy; chemical composition was carried out by energy dispersive X-ray spectrometry (EDS) microanalysis and microhardness testing. The results showed that the formation of eutectic microconstituents, within the joint regions, was significantly influenced by the brazing parameters and gap size, also that formation of eutectic constituents decreased by allowing a sufficient amount of time for a complete isothermal solidification to take place at the brazing temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1242: Symposium 4 – Materials Characterization , 2009 , S4-57
Copyright
Copyright © Materials Research Society 2010

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References

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