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Evolution of microstructure of 304 stainless steel joined by brazing process

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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.

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  1. Corporación Mexicana de Investigación en Materiales (COMIMSA), Calle ciencia y tecnología No. 790, Col. Saltillo 400, C.P., 25290, Coahuila, México

    F. García-Vázquez, I. Guzmán-Flores, A. Garza & J. Acevedo

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  1. F. García-Vázquez
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  2. I. Guzmán-Flores
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  3. A. Garza
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  4. J. Acevedo
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Correspondence to F. García-Vázquez.

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García-Vázquez, F., Guzmán-Flores, I., Garza, A. et al. Evolution of microstructure of 304 stainless steel joined by brazing process. MRS Online Proceedings Library 1276, 12 (2010). https://doi.org/10.1557/PROC-1276-12

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  • DOI: https://doi.org/10.1557/PROC-1276-12

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