2/12/2023 0 Comments Fillet autocad 2012It turns out that this is often the case for residual stresses introduced during heat-treatment (see above and Table 16.5). The direction normal to the pancake microstructure is called the short transverse (ST) direction, and SCC is favoured when there are sustained tensile stresses in this direction. The elongated grain boundaries are usually retained during subsequent heat treatments and provide easy fracture paths, especially for SCC. The rolling, forging and extrusion processes required to fabricate half-products and finished components cause the material grains to elongate in the direction of working, resulting in a ‘pancake’ microstructure. This is of major importance to the SCC behaviour of aircraft components made from high strength aluminium alloys. The crack path in commercial alloys is entirely intergranular. Smith, in Stress Corrosion Cracking, 2011 Characteristics of aluminium alloy SCCĪluminium alloy SCC can initiate from nominally undamaged smooth or notched surfaces (e.g., fillet radii and holes) as well as surfaces damaged by corrosion and abrasion.
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