Nitrogen distribution on rapid solidification in laser welded duplex stainless steels

Summary

Although several surfacing processes have been proposed and applied, none has been able to apply a 1 mm thick hard layer. This paper describes fundamental research to establish friction surfacing as a technique for applying a 1 mm thick hard layer.

Experiments were run to clarify the effects of operating parameters on surface quality using a conventional friction welder fitted with a sliding stage. The materials selected were a 1C‐17Cr martensitic stainless steel coating material and a low‐carbon structural steel substrate.

A stable hard layer of 20 mm width and 1 mm thickness was obtained, with no dilution being found. The dimensions of the coating depend on the friction speed (rotational speed) of the coating material. Thicker and wider coatings are produced at a lower friction speed. The deposition rate is slightly lower than that of conventional arc welding processes under the experimental conditions presently adopted.