Abstract
Friction Stir Processing (FSP) is a solid-state process where friction forces between a
non-consumable, rotating tool and the work piece generate substantial heat, softening the
material. The softened material is transferred around the tool where it cools and hardens
behind the tool. Traditionally, optical microscopy has been utilized to qualitatively
characterize and locate the various zones of the processed region. Grain size and
orientation distribution functions (GSODFs) obtained from several of these distinct zones
in the FSP process zone in X-65 steel are presented. Their anticipated yielding properties
have been analyzed in terms of yield surfaces. The non-orthorhombicity of the GSODFs
demands the construction of yield surfaces in the full 5-dimensional deviatoric stress
space. Results are interpreted in terms of the effects of variations in local yield behavior,
due to zonal differences in microstructure, on macroscopic behavior.
non-consumable, rotating tool and the work piece generate substantial heat, softening the
material. The softened material is transferred around the tool where it cools and hardens
behind the tool. Traditionally, optical microscopy has been utilized to qualitatively
characterize and locate the various zones of the processed region. Grain size and
orientation distribution functions (GSODFs) obtained from several of these distinct zones
in the FSP process zone in X-65 steel are presented. Their anticipated yielding properties
have been analyzed in terms of yield surfaces. The non-orthorhombicity of the GSODFs
demands the construction of yield surfaces in the full 5-dimensional deviatoric stress
space. Results are interpreted in terms of the effects of variations in local yield behavior,
due to zonal differences in microstructure, on macroscopic behavior.
| Original language | English |
|---|---|
| State | Published - Jun 1 2008 |
| Externally published | Yes |