Author/Authors :
Zirehpour، Gh. نويسنده Department of Materials Engineering, Iran University of Science and Technology, Tehran, Iran , , Shoja Razavi، R. نويسنده Department of Materials Engineering, Malek Ashtar University of Technology, Isfahan, Iran , , Moayerifar، E. نويسنده Department of Materials Engineering, Malek Ashtar University of Technology, Isfahan, Iran ,
Abstract :
As the turbine industries need to manufacture turbine blades made of martensitic stainless steel AISI 420 with
high toughness and wear resistance, local laser hardening has become more and more important. In this research,
surface of the samples was initially hardened by high-power pulsed laser beam; then, optimum parameters of
hardening were calculated and wear resistance of surface hardened samples were compared with the similar
parameter in the surface raw samples. Scanning Electron Microscope (SEM) was used to determine microstructure
and surface phases. Reciprocating wear test was also performed for surveying wear resistance of the samples. The
results showed that laser surface treatment led to producing a martensitic-austenitic microstructure and dissolution
and/or redistribution of carbides. Hardness of surface of hardened samples was obtained about 700 Hv after laser
hardening. Wear mechanism was transformed from laminate to abrasive during the testing
