Wear and corrosion resistance of Nb-V carbide layers produced in vermicular cast iron using TRD treatments

Effects of Vermiculariser, Inoculant and Copper Addition on Microstructure and Corrosion Properties of Vermicular Graphite Cast Iron

“…Vermicular cast irons present graphite in the form of shorter and thicker veins, in addition to having rounded contours. The irregular surface causes the veins to show strong adhesion with the matrix [16]. The parameters such as matrix phase, graphite content and graphite morphology may influence the properties of cast iron [17].…”

“…The pearlite phase, formed by the aligning of ferrite and cementite (Fe 3 C) lamellas side by side, is not superior in resistance against corrosion. The addition of alloying elements such as copper, nickel and molybdenum delays the end of the transformation of the ausferrite [16]. Furthermore, if the alloying elements added to the structure do not have an ability to form a passive film to cover the surface, they generally have no effect on material's corrosion resistance.…”

“…The obtained graphite has vermicular morphology, hence the name vermicular cast iron. The irregular surface causes the veins to show strong adhesion with the matrix [16]. The parameters such as matrix phase, microhardness, graphite content and graphite shape may influence the properties of cast iron.…”

Production of Niobium Carbide Layers on High‐Strength Bainitic Steels by Thermochemical Treatment of Thermoreactive Diffusion Followed by Austempering

“…TRD in conjunction with the austempering treatment has already been successfully applied to vermicular and ductile cast iron, where, after removal from the TRD bath, samples were directly cooled and held at 300 C in the austempering salt bath. [13] The TRD process involves the production of hard and highly resistant carbide layers in ferrous alloys. This treatment utilizes a…”

Produção e caracterização de ferros fundidos nodulares ligados com nióbio submetidos a tratamentos termoquímicos de boretação e termorreativos

“…Resultados similares do comportamento da resistência a corrosão exibidos pelas camadas de TRD do presente estudo, foram observados em trabalhos publicados por outros pesquisadores, onde os tratamentos foram realizados em substratos de AISI 1045, AISI 52100 e em um ferro fundido vermicular, em meio salino e com condições semelhantes. Os autores concluíram que as camadas produzidas via TRD exibiram melhor resistência a corrosão, quando comparadas ao substrato sem tratamento, e os mecanismos de corrosão nas camadas ocorreram de maneira localizada, onde a solução salina penetra no substrato por meio da camada, levando a uma corrosão uniforme [96], [77], [107].…”