Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
316L Stainless Steel Diffusion Bonding Optimized Parameters
Submission Author:
Luisa Mateus , SC
Co-Authors:
Gustavo George Verdieri Nuernberg, Grégori Rosinski, Priscila Gonçalves, Marcus Vinicius Volponi Mortean, Regis Henrique Goncalves e Silva, Andre Monteiro, Marcia Mantelli, Luisa Mateus
Presenter: Luisa Mateus
doi://10.26678/ABCM.COBEM2017.COB17-2078
Abstract
Diffusion bonding is a process that joins two mating surfaces through the atomic diffusion of the material in the solid state. Comparing to conventional joining methods, such as brazing, the process is more useful for certain applications, due to the larger mechanical resistance achieved between the bonded surfaces. Other advantages are the absence of filler material that may cause corrosion problems, beyond the lower processing temperatures, which avoid the liquid phase formation and the deleterious microstructural modification associated. These characteristics make diffusion bonding a suitable method for compact heat exchanger fabrication. The diffusion bonding is a result of the combination of three main parameters: heat, pressure and time. This paper provides an overview of the study conducted to determine suitable parameters for the bonding of AISI 316L stainless steel. Samples were diffusion bonded and from these bonded blocks, 40 specimens were machined for tensile tests as well as microstructural analysis, to define the best process parameters. It was concluded that the temperature is the parameter that most influences the quality of the bond, as expected, since it increases the mass transport. The temperature that yielded the best results was 1040⁰C, regardless the pressure and time parameters evaluated, which resulted in similar mechanical property results. Therefore, those parameters will be later applied in the fabrication of 316L stainless steel cores of compact heat exchangers.
Keywords
Diffusion bonding, Compact Heat Exchangers, 316L Stainless steel
