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The degradation of dissimilar explosively welded joints due to thermal ageing

Authors
Journal
International Journal of Pressure Vessels and Piping
0308-0161
Publisher
Elsevier
Publication Date
Volume
75
Issue
10
Identifiers
DOI: 10.1016/s0308-0161(98)00078-7

Abstract

Abstract The effect of thermal ageing on the microstructure and shear strength properties of an explosively welded dissimilar joint has been investigated using compositional analysis and a novel shear testing technique. Ageing temperatures of 1000°C and 115°C were used up to 4000 h, and in each case Al was found to diffuse from the ODM751 to the CR39W, and Ni diffused in the opposite direction. For the majority of ageing conditions, good joint integrity was maintained after ageing, as shear testing produced failure in the ODM material. However, extreme ageing at 1150°C for 4000 h produced joint failure by shear, and was explained by a loss of integrity due to oxide spalling producing a separation of the joint region.

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