Large forging manufacturing process

摘要

A process for forging large components of Alloy 718 material so that the components do not exhibit abnormal grain growth includes the steps of:a) providing a billet with an average grain size between ASTM 0 and ASTM 3;b) heating the billet to a temperature of between 1750° F. and 1800° F.;c) upsetting the billet to obtain a component part with a minimum strain of 0.125 in at least selected areas of the part;d) reheating the component part to a temperature between 1750° F. and 1800° F.;e) upsetting the component part to a final configuration such that said selected areas receive no strains between 0.01 and 0.125;f) solution treating the component part at a temperature of between 1725° F. and 1750° F.; andg) aging the component part over predetermined times at different temperatures.A modified process achieves abnormal grain growth in selected areas of a component where desirable.