Effect of alloying elements on the dry sliding wear behavior of high chromium white cast iron and Ni-hard iron

High chromium white cast iron (HCCI) is used in the grinding rolls of pulverizers of the thermal power plants for crushing coal into fine particles. Currently, there is a sharp depletion of high grade coal, thereby, increasing the need for utilization of coal with higher mineral content. This usage of high mineral coal poses a problem of enhancing the wear rate of grinding media. This increases the demand for development of materials which pulverize coal to have longer service life. The present work provides insight into the effect of alloying additions of V, Ti and B to HCCI on the dry sliding wear behavior. Dry sliding wear behavior was studied using pin on disc method with speeds of 159 RPM, 319 RPM, 478 RPM under different load conditions of 10 N, 20 N and 30 N. Some of the alloys have higher coefficient of friction and exhibit higher wear rate while others have lubricating effect and exhibit lower wear rate. The medium speed of 319 RPM and 30 N load exerts the maximum wear rate on most of the alloys. This work also provides comparison of the wear resistance offered due to alloying additions to HCCI with Nihard iron. The role of secondary carbides in enhancing wear resistance is also discussed. Copyright (c) 2022 Elsevier Ltd. All rights reserved.Selection and peer-review under responsibility of the scientific committee of the International Conference on Latest Developments in Materials & Manufacturing