| The present paper is a continuation of earlier studies devoted to the Alloy 718 processed by severe plastic deformation techniques such as high pressure torsion and multi-axial forging. Microhardness of the alloy in a nanostructured condition was found to be higher on 20- 30% than that of the conventional coarse-grained counterpart. Tensile tests of the nanostructured alloy after multi-axial forging have shown very high strength and lower ductility. Fatigue tests at room temperature were performed for the nanostructured condition subjected to heat treatment and for the conventional coarse-grained condition. The tests revealed appreciably higher fatigue properties of the nanostructured alloy subjected to heat treatment in contrast to the conventional coarse-grained alloy. The obtained results have shown that the mechanical properties of the Alloy 718 in the nanostructured condition can be significantly improved using appropriate heat treatment. |
full paper (pdf, 704 Kb)