Abstract:

      In the present work, we have investigated the sample orientation effects on the wear behaviour of laser powder bed fusion (LPBF) processed 17%Cr-4%Ni precipitation hardenable (P.H) steel. The samples were printed in three directions (horizontal (0^o), vertical (90^o) and inclined (45^o) in the build platform using DMLS system (EOS M 290) machine. 17%Cr-4%NiP.H steel samples were given rough polish, medium polish and fine polish. The microstructure was studied for both as printed and surface modified conditions using scanning electron (SEM) microscopes. The wear test was tested for all three orientations. The input parameters selected were: applied load of 10N, sliding distance of 1000m, rubbing time of 30min with ambient working temperature. The wear rate was measured and compared among orientations for as printed and surface modified conditions to identify the best orientation. The post worn surface was analysed using SEM to identify wear mechanisms.