Composition and structure of plasma-sprayed high-carbon steels

Abstract

1. The structure of plasma-sprayed steel coatings and their strength of adhesion to a substrate are governed to a large extent by the technological parameters of the spraying process. Under the optimum conditions, the resistance to stripping of such coatings equals 325 kg/cm2. 2. During plasma spraying with U8A and PK-2 steel wires, the carbon content changes from 0.79% in the initial condition to 0.63%. 3. During the plasma spraying process, phase transformations take place in the steel, resulting in the formation of quench sorbite. 4. A characteristic feature of the structure of plasma-sprayed steel coatings is its nonuniformity, the carbon content of local volumes of material varying from 0.16 to 0.7%. 5. The presence of phase transformations in high-carbon steels during plasma deposition provides a means of controlling the structure and properties of plasma-sprayed steel coatings.