Isothermal Oxidation Performance of Laser Cladding Assisted with Preheat (LCAP) Tribaloy T-800 Composite Coatings Deposited on EN8

It is anticipated that laser cladding assisted with preheat (LCAP)-deposited Tribaloy (T-800) composite coatings enhances resistance to structural degradation upon exposure elevated-temperature oxidation service environments. The kinetics of LCAP T-800 deposited on EN8 substrate and its mechanisms have not been explored in severe conditions are similar operational parameters. isothermal behaviour the coating via was studied at 800 °C air for up 120 h (5 × 24 cycles) contrasted uncoated samples. mass gain per unit area eight times less than substrate. parabolic rate constant (Kp) 6.72 10−12 g2·cm−4·s−1, whilst 8.1 10−13 g2·cm−4·s−1. This attributed a stable chromium oxide (Cr2O3) layer formed surface, thereby preventing further oxidation, iron film allowed permeation oxygen ions into oxide. (Fe2O3) developed spalled, as evidenced by cracking when time greater 72 h, Cr2O3 maintained integrity h. A law observed coating, paralinear reported can be used turbine parts where temperatures <800 °C.