"Tribological behaviour of the Bare and Thermal sprayed Hot Forming Tool Steels"

High-temperature tribology plays an important role in many engineering applications such as metal forming operations and aerospace industry. Several problems in hot-metal forming of high strength steels occur such as oxidation of tool, workpiece surfaces, increased wear of tools and scaling of workpiece. Moreover, operations at elevated temperatures can significantly influence frictional behavior of tool steels [1]. Present research attempts to experimentally characterise and understand tribological behaviour of AISI H11 and AISI H13 under dry conditions at room temperature. High Velocity Oxy-fuel (HVOF) spray NiCrBSi coating was developed on tool materials. The room-temperature wear performance of uncoated and coated tool steels was evaluated on pin-on-disc tribometer in laboratory. In-depth analysis of exposed as-sprayed and worn samples was examined with X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometry (EDS).

References:

1. 1.     Hardell J. and Prakash B.: Int. Journal of Refractory Metals & Hard Materials, Vol. 28 (2010), 106-114