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Microstructural Characterization of the Laser Welding in a Nickel Based Superalloy

Published online by Cambridge University Press:  13 November 2019

Mayra Jurado ,
Gerardo Altamirano ,
Jorge Leobardo Acevedo  and
Alvaro Aguirre
Mayra Jurado*
Affiliation:
Instituto Tecnológico de Saltillo, Blvd. Venustiano Carranza #2400, Colonia Tecnológico, Saltillo, Coahuila, México.
Gerardo Altamirano
Affiliation:
Instituto Tecnológico de Saltillo, Blvd. Venustiano Carranza #2400, Colonia Tecnológico, Saltillo, Coahuila, México.
Jorge Leobardo Acevedo
Affiliation:
Corporación Mexicana de Investigación en Materiales, Ciencia y Tecnología #790. Col Saltillo 400. CP 25290 Saltillo, Coahuila, México.
Alvaro Aguirre
Affiliation:
Corporación Mexicana de Investigación en Materiales, Ciencia y Tecnología #790. Col Saltillo 400. CP 25290 Saltillo, Coahuila, México.
*
*(Email: [email protected])
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Abstract

In this research it was experimentally analyzed the effect of the parameters of the Pulsed Micro Laser Welding Process Nd:YAG on the microstructural behavior of a nickel base superalloy (IN-738). For this purpose, different laser welding tests were performed on samples subjected to different heat treatment conditions obtained from the gas turbine blades. The influence of the power and the speed welding of the applied process and heat treatment condition on the weld geometry, microstructure and mechanical properties was determined. The microstructures of the obtained welds were characterized by scanning electron microscopy and Vickers hardness tests. In general, alternatives to homogenize and rejuvenate the microstructure of the base material are proposed in order to avoid the formation and propagation of cracks. The results are discussed mainly in terms of the present phases and decomposition of carbides, which considerably affect the weldability of the IN-738 superalloy. This study provides useful information for the subsequent restoration of the 2nd step turbine blades by using of the Laser Welding Process Nd:YAG.

Keywords

weldinglaseralloy
Type
Articles
Information
MRS Advances , Volume 4 , Issue 63: International Materials Research Congress XXVIII , 2019 , pp. 3463 - 3473
Copyright
Copyright © Materials Research Society 2019 

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References

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