Objective modelling of diffusion bonding in superplastic duplex stainless steels

Conference item

An objective examination of the assumptions and predictions of a simple model for diffusion bonding has been conducted by using (i) quantitative metallography to check its assumptions and (ii) extreme conditions to isolate the individual mechanisms on which the model is based. Sound bonds were achieved under a wide range of conditions, including the application of atmospheric pressure only. Diffusional mechanisms played an important role in bonding and good agreement between the model and the experimental results was obtained providing the instantaneous values for microstructural parameters were used. Accurate estimates of total bonding times were not possible using conventional models, however, because the separation of the interfacial voids varied continuously during bonding. A simple SPF/DB cellular structure has been produced. The superplastic properties of the material were sufficiently uniform to produce a shape with excellent symmetry.

Authors: Todd, R; Hodges, C; Wong, Y; Wang, Z; Ridley, N

• Publication status: Published
• Journal: SUPERPLASTICITY IN ADVANCED MATERIALS - ICSAM-97
• Volume: 243-2
• Pages: 675-680
• Publication date: 1997-01-01
• Event title: 1997 International Conference on Superplasticity in Advanced Materials (ICSAM-97)
• ISSN: 0255-5476
• ISBN: 0878497595
• Keywords: SPF/DB; lap shear test; cellular structures; stainless steel; diffusion bonding