Session Details
Session 2: Metal Finishing: Past, Present, and Future
Abstract Number:
29
The audience is anyone that uses stainless steel in an application that requires a coating or additional treatment to help it survive certain conditions. Applicable job roles are someone involved with the design, manufacture, engineering, or quality control of stainless steel components.
Topics:
Advances in Surface Finishing Technology
General Surface Finishing
Austenitic and duplex stainless steels are often the material of choice when it comes to applications in corrosive environments. While the excellent corrosion resistance makes them a favorable choice, poor tribological behavior, especially low abrasive / adhesive wear resistance and a tendency to fretting, has prevented a broader use of these materials in applications where both corrosion and wear resistance are required. For more than 20 years low temperature carburizing has offered a solution to enhance mechanical properties without altering the corrosion resistance. This thermo-chemical diffusion process forms a carbon S-phase while avoiding carbide precipitation that causes sensitization.
Due to the addition of large concentrations of carbon atoms, high compressive stresses are formed at the surface. These compressive stresses along with occupation of the interstitial sites by carbon atoms cause an increase in the surface hardness of the material and improved mechanical properties.
The purpose of this technical discuss is to provide a brief introduction into this technology. A more detailed review follows on the commercially available low temperature carburizing treatment known as Kolsterising®, and discusses the mechanical benefits on galling behavior, wear resistance, cavitation erosion, and fatigue strength.