Abstract
This paper presents a detailed examination of the structure of the transitional area between a brazing alloy and the parent material, the dimensions of the diffusion zones that are created, and the influence on them of a change in the brazing parameters. Connections between Ni-based brazing alloys (NI 102) with a small content of B and AISI 321 stainless steel (X6CrNiTi 18–10) were created in a vacuum (10−2 Pa) at various brazing temperatures and for various holding times at the brazing temperature. Various specimens were tested. First, the brazing alloys were wetted and the dependence of the wetting on the brazing parameters was assessed. Then a chemical microanalysis was made of the interface between the brazing alloy and the parent material. The individual diffusion zones were identified on pictures from a light microscope and REM, and their dimensions, together with their dependence on the brazing parameters, were determined.
Highlights
High-temperature brazing of stainless steels is a specific method for connecting materials that can create high-quality, demountable connections without local thermal impact on the connected material
Brazing alloys NI 102 on stainless steel AISI 321 were distinguished by very good wetting at all brazing parameters
A chemical microanalysis showed that the solubility zone of parent material (PM) in the brazing alloy and the interface between the brazing alloy and PM are created to a significant extent only by Fe and Cr, and the results indicate that the proportion of Ni and Si is significantly lower
Summary
High-temperature brazing of stainless steels is a specific method for connecting materials that can create high-quality, demountable connections without local thermal impact on the connected material. Hightemperature brazing can be applied where it is not desirable to use welding because of the thermal impact or because of the complexity of the connections that will be created [1]. Nickel-based brazing alloys are the most suitable for high-temperature brazing of stainless steel. When parts made of stainless steel are connected by a hightemperature nickel brazing alloy, the metallurgical connection has characteristics similar to those of a welded connection. A high-vacuum atmosphere in high-temperature brazing prevents the brazing alloy and PM interacting with the ambient atmosphere, so it is not necessary to use fluxes with this method. Brazing in a vacuum complies with the latest world trends in machine technology, and is the most favoured high-temperature brazing method [3]
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