Patent ID: 11971063
Assignee: LISI AEROSPACE
Field: Materials, metallurgy (Chemistry)
Classification: CPC F  C | IPC C  F

Claim 4:
5. A method for manufacturing a fastening element according to claim 1, said method comprising the steps of:
providing a fastener blank made of a beta-metastable titanium alloy, said alloy having a second microstructure consisting of a second matrix of beta phase and alpha-phase nodules distributed in said second matrix, said alloy having a temperature (Tβ) of transformation of the alpha-phase alpha phase;
first heat treatment of the fastener blank, at a first temperature in a range [Tβ−100° C.; Tβ−10° C.], followed by cooling; then
second heat treatment of the fastener blank, at a second temperature of between 440° C. and 600° C.;, the method further comprising a step of deforming the fastener blank to perform the serrated shape, after the first heat treatment.