Microstructure and Mechanical Characterization of Iron Based Hardfacing Developed by Submerged Arc Welding

摘要

A high carbon Fe-Cr-C alloy is used to deposit over a low carbon steel to improve its wear resistance. Welding processes are generally used in the industry for depositing these hard layers. Among all welding processes, submerged arc welding (SAW) process is most widely used as it gives high deposition rate as compared to the other welding process. In this study three hardfacing layers with different carbon percentage were developed with the help of SAW. Final developed layers were subjected for different tests for its characterization. First test was performed for chemical composition analysis and results shows high amount of alloying elements in the hardfacing layers. Microstructural analysis was also done which shows more amount of carbide volume precipitation with increase of carbon percentage and it shows mixture of hard carbide in a matrix of austenite. Hardness test was also performed and result shows as the amount of carbon is increasing in the hardfacing layer, hardness value is also increasing which shows a better mechanical and tribological property of the layers.