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has been cited by the following article:

• TITLE: Erosion and Toughening Mechanisms of Electroless Ni-P-Nano-NiTi Composite Coatings on API X100 Steel under Single Particle Impact

  AUTHORS: Marissa MacLean, Zoheir Farhat, George Jarjoura, Eman Fayyad, Aboubakr Abdullah, Mohammad Hassan

  KEYWORDS: Electroless Ni-P Composite Coating, Superelastic NiTi, Single Particle Impact, Erosion Mechanisms, Toughening

  JOURNAL NAME: Journal of Surface Engineered Materials and Advanced Technology, Vol.9 No.4, October 22, 2019

  ABSTRACT: The addition of superelastic NiTi to electroless Ni-P coating has been found to toughen the otherwise brittle coatings in static loading conditions, though its effect on erosion behaviour has not yet been explored. In the present study, spherical WC-Co erodent particles were used in single particle impact testing of Ni-P-nano-NiTi composite coatings on API X100 steel substrates at two average velocities—35 m/s and 52 m/s. Erosion tests were performed at impact angles of 30°, 45°, 60°, and 90°. The effect of NiTi concentration in the coating was also examined. Through examination of the impact craters and material response at various impact conditions, it was found that the presence of superelastic NiTi in the brittle Ni-P matrix hindered the propagation of cracks and provided a barrier to crack growth. The following toughening mechanisms were identified: crack bridging and deflection, micro-cracking, and transformation toughening.