EFFECTS OF SURFACE ROUGHNESS ON SUPERPLASTIC CARBURIZING OF DUPLEX STAINLESS STEEL

摘要

Superplastic carburizing (SPC) is a carburizing process that combines carburizing with superplastic deformation. Since SPC involves direct interaction between the superplastically deformed surface and the solid carbon medium, the effect of surface roughness on the process cannot be disregarded. This paper presented the study of surface roughness effects on superplastic carburizing of duplex stainless steel (DSS). SPC was conducted under four different surface roughness (Ra) conditions of 0.9, 0.3, 0.1 and 0.03μm. The microstructure, surface hardness, and carburized layer thickness were studied. Comparisons also were done on non-superplastic material. The results showed that the surface roughness strongly affected the properties of the superplastically carburized duplex stainless steel while its effects on the non-superplastic material were not that obvious.