| 摘要 |
A first workpiece comprises a compressor disc ( 2 ) manufactured from a titanium alloy forging. A number of second workpieces, aerofoil blades ( 4 ), also forged from titanium alloy are arranged for attachment to the disc ( 2 ). The aerofoil blades ( 4 ) are evenly distributed around the radially outer surface ( 8 ) of the disc ( 2 ) and the root ( 6 ) of each blade ( 4 ) is joined to the surface ( 8 ) of the disc ( 2 ) by hot isostatic pressing. To assist in joining the blades ( 4 ) to the disc ( 2 ), one of the surfaces ( 6 or 8 ) is modified by reducing the density by 50-70% to a depth of 0.25-0.5 mm. This is achieved by depositing a layer of metal powder on the surface. Modifying one of the surfaces ( 6 or 8 ) forms a compliant layer between the workpieces ( 2 and 4 ). When pressurised this compliant layer accommodates distortion during consolidation and also acts to disrupt the other surface to reveal virgin material and enhance bonding.
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