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Title: Surface Treatment of Austenitic Ni-Fe-Cr-Based Alloys for Improved Resistance to Intergranular-Corrosion and-Cracking
Author: DL Limoges; G Palumbo; PK Lin, all of (CA)
Source: US Patent 6,344,097 B1
Publication year 2002
Document number: 2002077
Number of pages: 6
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.
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This page last revised: 04/24/2008