Friction and Sliding Wear Behaviour of Bare and Thermal Sprayed Tool SteelsAuthor : Nipun Sharma and Manpreet Kaur
Volume 3 No.2 July-December 2014 pp 51-55
Several hot forming processes are bound with severe problem of sliding wear resulting in failure of die. The surfaces of the tools get damaged severely due to the application of repeated cyclic contact between the hot workpiece and the tool. Therefore, the present research work aims to experimentally analyze the sliding wear behavior of bare and High Velocity Oxy-fuel (HVOF) sprayed hot forming tool steels under dry conditions at room temperature. AISI H11 and AISI H13 tool steels were selected in the study. NiCrFeSiBC – (WC-Co) coating was deposited by HVOF spray process on tool steels. The as-sprayed coatings were characterized by X-ray diffraction (XRD) analysis and Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometry (EDS) analysis. Wear performance of the uncoated and the coated tool steels was evaluated on the pinon- disc tribometer in laboratory so as to ascertain the usefulness of the developed coating composition. The variations of wear rate with the sliding distance for all the specimens studied were plotted. Based on the observations, it was found that H13 showed the least wear rate at 20N load and at a load of 40N H11 showed the least wear rate.
Hot forming, Sliding Wear, High Velocity Oxyfuel, Characterization, wear rates