Patent ID: 8608868
Filing Date: 2013-12-17
Classification: C23C

Abstract:
1. A method for improving surface mechanical properties of non-austenitic stainless steels comprising the steps of: providing a non-austenitic stainless steel material; placing the non-austenitic stainless steel material in an environment containing at least one austenite-stabilizing element, and applying a driving force to implant the at least one austenite-stabilizing element into a surface of the non-austenitic stainless steel material to form a modified layer rich in the at least one austenite-stabilizing element; and placing the non-austenitic stainless steel material in a carbon-bearing atmosphere to make the modified layer in contact with the carbon-bearing atmosphere, and maintaining the non-austenitic stainless steel material at a carburizing temperature below 600° C. to implant carbon atoms into the modified layer to form a carburized layer.