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Evolution of microstructure of 304 stainless steel joined by brazing process

Published online by Cambridge University Press:  01 February 2011

F. García-Vázquez ,
I. Guzmán-Flores ,
A. Garza  and
J. Acevedo
F. García-Vázquez
Affiliation:
Corporación Mexicana de Investigación en Materiales (COMIMSA), Calle ciencia y tecnología No. 790, Col. Saltillo 400, C.P. 25290, Coahuila, México email: [email protected]
I. Guzmán-Flores
Affiliation:
Corporación Mexicana de Investigación en Materiales (COMIMSA), Calle ciencia y tecnología No. 790, Col. Saltillo 400, C.P. 25290, Coahuila, México email: [email protected]
A. Garza
Affiliation:
Corporación Mexicana de Investigación en Materiales (COMIMSA), Calle ciencia y tecnología No. 790, Col. Saltillo 400, C.P. 25290, Coahuila, México email: [email protected]
J. Acevedo
Affiliation:
Corporación Mexicana de Investigación en Materiales (COMIMSA), Calle ciencia y tecnología No. 790, Col. Saltillo 400, C.P. 25290, Coahuila, México email: [email protected]
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Abstract

Brazing is a unique method to permanently join a wide range of materials without oxidation. It has wide commercial application in fabricating components. This paper discusses results regarding the brazing process of 304 stainless steel. The experimental brazing is carried out using a nickel-based (Ni-11Cr-3.5Si-2.25B-3.5Fe) filler alloy. In this process, boron and silicon are incorporated to reduce the melting point, however they form hard and brittle intermetallic compounds with nickel (eutectic phases) which are detrimental to the mechanical properties of brazed joints. This investigation deals with the effects of holding time and brazing temperature on the microstructure of joint and base metal, intermetallic phases formation within the brazed joint as well as measurement of the tensile strength. The results show that a maximum tensile strength of 464 MPa is obtained at 1120°C and 4 h holding time. The shortest holding times will make boron diffuse insufficiently and generate a great deal of brittle boride components.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1276: Advanced Structural Materials–2010 , 2010 , 12
Copyright
Copyright © Materials Research Society 2010

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