Experimental Investigation to Explore the Effects of Chromium and RE addition on Mechanical Behavior of Hardfacing on Grey C.I.

Abstract

Due to rapid growth in the industrialization and also in the field of urbanization, demand for repairing the equipment’s increased. The hardfacing technique for repairing and increasing the life of equipment was one of them in the top of the list. "Preventive hardfacing" is the utilization of hardfacing procedures to the generation of a fresh component. In the current investigation the effect of various rare earth oxide with the addition to chromium was done to calculate the wear and corrosion behavior of hardfacing on grey cast. By using electrode of TENALLOY 16-7016 having a hardness of 150 BHN. First five samples were prepared for EBSD and for microhardness tester with chromium weight percentage of 1.7 %, cerium oxide with weight percentage of 0.6% and lanthanum oxide of 0.4 % and at last filled them in the groove on grey cast iron sample. The lanthanum oxide showed the refined grain structure in EBSD testing and the sample of chromium and lanthanum oxide showed least mean grain size. Micro-hardness testing done at dwell time of 20 seconds and at a load of 500 gm which showed maximum value of hardness which proved Hall Petch equation that the hardness component with least grain size showed the maximum hardness value. Pin-on-disc machine used EN 31 high speed steel and for this experiment six samples were prepared which were operated at 955, 764, 1273,546, 477and 637 rpm and after every 5 minutes the sample was weighted. From the calculated results it was observed that the chromium sample got less wear than the other samples and the maximum wear found in chromium and cerium oxide sample. For corrosion testing, salt spray chamber for 120 hours i.e. almost for 5 days placed under the spraying of Nacl solution. Results states that chromium and cerium oxide sample showed less corroded area among the other samples with area corroded of 18%. It can be inferred from the experimentation that the chromium and lanthanum oxide sample increased the hardness along with least abrasive size. During corrosion analysis the best sample was the chromium and cerium oxide with weight of 1.57% and in wear analysis the best sample to resist weight loss was the chromium sample with weight of 1.78%.