Process for improving both fatigue strength and toughness of high-strength Al alloys
US4511409A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1983 |
| Grant date | Apr 16, 1985 |
| Priority date | — |
| Expiry date | Jul 1, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/057
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention concerns a process for improving the characteristics in respect of fatigue strength and toughness of worked Al alloys in the treated state, by means of a thermo-mechanical treatment which is carried out on the cast and possibly homogenized product. It comprises the following steps: PA0 (a) casting an initial product along an axis XX' by a known method PA0 (b) optional homogenization PA0 (c) upsetting in the hot state, preferably by means of a press, along the axis XX', with an upsetting ratio (initial length/final length along axis XX')>1.4 PA0 (d) drawing in the hot state in the direction of the axis XX', with a rate of working (initial cross section/final cross section, considered perpendicularly to the axis XX')>1.5 PA0 (e) compression in the hot state along an axis perpendicular to the axis XX', with a rate of reduction (initial cross section-final cross section/initial cross section)>15% PA0 (f) rolling, hot extrusion or forging, under the usual conditions, and the usual operations for quenching and tempering with possible relief of stresses by cold working (states T6, T651 or T652 for example). For equivalent mechanical characteristics, it makes it possible to i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.