Investigation of microstructure and mechanical properties of friction welded aisi 316 and ck 45 steels

Abstract

This study has arisen from the necessity to manufacture an impeller and a shaft pair of a water pump from two different types of steels. The impeller has to have resistant to corrosion and the shaft has to have magnetic permeability property. It is deemed suitable to use the AISI 316 austenitic stainless steel performing high resistance corrosion for the impeller and Ck 45 carbon steel with magnetic permeability property for the shaft. The joining of AISI 316 and Ck 45 steels has been achieved by using the friction welding method. After welding process, the tests of tensile and micro hardness were applied, the microstructures were observed, and composition of elements was found in the welding zone. As optimum welding parameters, 100 MPa of friction pressure, 10 s of friction time, 200 MPa of upset pressure and 20 s of upset time were determined in 3000 rev/min rotation speed.