Surface treatment of austenitic Ni-Fe-Cr-based alloys for improved resistance to intergranular-corrosion and-cracking
US6344097B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 2000 |
| Grant date | Feb 5, 2002 |
| Priority date | — |
| Expiry date | May 26, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2251/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A surface treatment process for enhancing the intergranular corrosion and intergranular cracking resistance of components fabricated from austenitic Ni—Fe—Cr based alloys comprised of the application of surface cold work to a depth in the range of 0.01 mm to 0.5 mm, for example by high intensity shot peening, followed by recrystallization heat treatment preferably at solutionizing temperatures (>900 C.). The surface cold work and annealing process can be repeated to further optimize the microstructure of the near-surface region. Following the final heat treatment, the process can optionally comprise the application of surface cold work of reduced intensity, yielding a cold worked depth of 0.005 mm to 0.01 mm, in order further enhance resistance to cracking by rendering the near surface in residual compression.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.