Fabrication of WC/Fe composite coating by centrifugal casting plus in-situ synthesis techniques

Preparation and Microstructural Characterization of a High-Cr White Cast Iron Reinforced with WC Particles

“…The wear behavior of components made of high-Cr WCIs can be more improved by ceramic reinforcement of the surfaces that will be exposed to wear, maintaining the toughness of the bulk component [9][10][11][12][13][14][15][16][17]. Among the reinforcements that can be applied, WC particles are the most used, combining high hardness (3100-3600 HV), thermal expansion coefficient (4.5-7.1 × 10 −6 • C −1 ) compatible with the base metal (8-12.5 × 10 −6 • C −1 ), higher elastic modulus compared with other transition metal carbides and good wettability by molten iron [18][19][20].…”

“…In the liquid-state technique, the molten metal infiltrates through compacted ceramic particles, previously placed in the mold cavity, reacting with it and producing a metal matrix composite. The process can be done by pressureless infiltration (spontaneous or reactive infiltration) [11,12,14,15,[24][25][26] or by pressure-driven infiltration (squeeze casting, vacuum pressure casting, centrifugal casting) [13,16,20,[27][28][29][30][31][32][33][34][35][36][37][38][39]. The major advantage of the liquid-state process is the possibility of producing products with complex geometry and parts with a surface reinforcement whereas higher wear resistance is needed [21][22][23].…”

The Effect of Fe Addition on Fragmentation Phenomena, Macrostructure, Microstructure, and Hardness of TiC-Fe Local Reinforcements Fabricated In Situ in Steel Casting

“…Both routes based on the use of the well-known self-propagating high-temperature synthesis (SHS) reaction, [1][2][3] which allows us to obtain carbides, borides, and nitrides directly from alloys. [4] The first way involves placing one reactant of a selected type of carbide in the form of a vanadium plate [5] or tungsten wire [6] into the mold cavity, while the second reactant is introduced as a component liquid alloy poured into the mold cavity. The molten alloy activates the reaction between the reactants introduced into the mold, and reinforcement particles such as vanadium carbide (VC) [5] and tungsten carbide (WC) [6,7] are formed directly in the casting.…”

“…[4] The first way involves placing one reactant of a selected type of carbide in the form of a vanadium plate [5] or tungsten wire [6] into the mold cavity, while the second reactant is introduced as a component liquid alloy poured into the mold cavity. The molten alloy activates the reaction between the reactants introduced into the mold, and reinforcement particles such as vanadium carbide (VC) [5] and tungsten carbide (WC) [6,7] are formed directly in the casting. Zhong et al [8] reported a method of producing WC reinforcement on the surface of an iron matrix based on a W plate introduced into a mold cavity, which is then filled by a liquid alloy.…”

“…The essence of the second method is the placement of green compacts containing mixtures of TiC or TiC and TiB 2 reactants undergoing the SHS reaction [9][10][11][12][13][14][15][16][17][18][19][20][21] in a mold cavity. [5][6][7][8][9][10][11][12][13][14][15] Similar to the previous method, the liquid alloy poured into the mold cavity activates the SHS reactions, but due to the self-sustaining reaction occurring in the whole compact, it is possible to fabricate an LR in a wide range of dimensions. This means that this method is particularly attractive for the local reinforcement of castings.…”