Recently high nitrogen steels (HNS) are known as advanced materials. Nitrogen alloying gives several beneficial effects on the many properties of steels. However, nitrogen loss unavoidably occurs when HNS is welded with fusion welding process, resulting in the reduction of corrosion resistance as well as mechanical properties. Friction welding is a solid-state joining process, and materials do not melt at the bonding interface. Hence defects associated with melting-solidification phenomena, such as nitrogen loss, weld porosity and weld cracking, do not take place. The objective of the present study is to evaluate the weldability of friction welding of high nitrogen stainless steel contained 1.2mass% nitrogen.
