Modelling of voids closure in the diffusion bonding process

J. Alegria, R. M. Miranda, J. M.Gomez De Salazar, A. A. Fernandes

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

Diffusion bonding is a solid-state welding process that allows the joining of similar or dissimilar heterogeneous materials preventing the weldability problems associated to fusion welding. Modelling of this process has been attempted by several authors like Hill and Wallach [1]. These authors considered that the plastic deformation between two surfaces in contact is one of the most important mechanisms involved in the process. This paper reports the results of diffusion bonding of 1045 steel. Modelling of the process was done using Hill and Wallach [1] parameters to define the surface roughness condition. During preparation for diffusion bonding a series of long parallel ridges, typically with 0.2 to 2 μm high (roughness asperity height) and 30-70 μm width (roughness wavelength) were produced. The initial contact of the asperities on the prepared surfaces created a series of voids with an elliptical shape (infinitely long parallel cylinders with elliptical cross-section). During the diffusion bonding process the shape of the voids changes, becoming smaller, mainly due to the pressure application. Since this is a diffusion controlled process, the use of temperature promotes the deformation process. A model using Finite Element Analysis coupled to a commercial software was developed considering two surfaces, containing an half void, which were brought into contact. The first model was developed with only one elliptical void with two different widths (30 and 70 μm) and 2 μm high. In this model enough pressure was applied to close completely the void. The second model considered three voids placed together to simulate the voids continuity. Finite Element Analysis was developed considering that initial contact between surfaces with asperities creates a series of voids with elliptical shape. In the initial stage of the process, the pressure applied changes the shape of the voids due to plastic deformation increasing the contact area. Microstructures were investigated.

Original languageEnglish
Title of host publicationAdvanced Materials Forum IV
Subtitle of host publicationSelected, peer reviewed papers from the IV International Materials Symposium Materiais 2007 and XIII Encontro da Sociedade Portuguesa de Materiais - SPM
EditorsAntonio Torres Marques, Antonio Torres Marques, Antonio Paulo Monteiro Baptista, Antonio Fernando Silva, Fernando Jorge Lino Alves, Carlos Sa, Luis Filipe Malheiros, Manuel Vieira, Manuel Vieira
PublisherTrans Tech Publications Ltd
Pages731-735
Number of pages5
ISBN (Print)9780878493739
DOIs
Publication statusPublished - 2008
EventAdvanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM - Porto, Portugal
Duration: 1 Apr 20074 Apr 2007

Publication series

NameMaterials Science Forum
Volume587-588
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

ConferenceAdvanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM
CountryPortugal
CityPorto
Period1/04/074/04/07

Keywords

  • Carbon steel
  • Diffusion bonding
  • Modelling
  • Welding

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