سیده نرجس حسینی

In this research, an investigation of the microstructure, hardness, corrosion, and wear behavior of Inconel 625-cladded layer on P460N Steel fabricated by Gas Tungsten Arc Welding has been done. Microstructural examinations using optical microscopy, scanning electron microscopy (with energy dispersive X-ray spectroscopy), and X-ray diffraction revealed the epitaxially grown dendrites with the average primary and secondary dendrite spacing of 17 and 9 lm in the cladded layer, and the Widmanstatten ferrites in the interface zone between the heat-affected zone and cladded layer. The hardness showed its maximum value of 230 HV at a depth of about 500 lm from the cladded layer’s surface, due to the more uniform distribution of precipitate particles and elements in this region. The Tafel and Cyclic polarization tests in the saline solution indicated that cladding of P460N Steel with Inconel 625 resulted in reducing the corrosion rate by about three times. The comparative pin-on-disk wear test demonstrated a decreasing wear coefficient and wear rates in cladded samples at low wear forces of 22.5 N. In contrast, the wear was intensified with increasing loading force to 45 N due to severe three-body abrasion. Although the wear coefficients were reduced in the water environment, it led to further destruction of the samples as a result of cavitation.