Structure and Microhardness of a Sprayed Austenitic Steel Coating after Friction Stir Processing
摘要
Abstract
The structure and microhardness of an austenitic steel coating plasma sprayed onto a cylindrical surface are studied after friction stir processing (FSP) with two steel tools at a pressure of 30 MPa. During FSP, the coating temperature is found to increase to 1235°C, which makes it possible to plastically deform the coating and to compact it by destroying the initial structure and welding sprayed particles. As a result of FSP, the microhardness of the coating increases from 3.2 to 4.6 GPa.