Effects of silicon content on the microstructure and corrosion behavior of Fe–Cr–C hardfacing alloys

Fe–24wt.%Cr–4.1wt.%C hardfacing alloy: Microstructure and carbide refinement mechanisms with ceria additive

“…The outstanding performance of the material at low stress abrasion conditions is associated with a large amount of primary M 7 C 3 carbide within the microstructure [4]. M 7 C 3 carbide, which is the reinforcing phase in Fe-Cr-C alloy, is well known for high hardness (1300-1600 HV) [5,6], excellent wear resistance [7] as well as good corrosion resistance [8]. In many cases, the failure of components made up of Fe-Cr-C alloy is associated with excessive surface wear after being used for a certain period of time.…”

Effect of Boron on Microstructure and Microhardness Properties of Mo-Si-B Based Coatings Produced Via TIG Process

“…According to Fig. 2a, a thin white layer was observed on the interface, which indicates good metallurgical bonding between the deposited coating and the substrate [11]. Figs.…”

Corrosion Behaviour of High Chromium White Iron Hardfacing Alloys in Acidic and Neutral Solutions

“…Before measuring corrosion potential, the electrolyte in the corrosion cell was deaerated using nitrogen gas for 30 min as described in the ASTM Standard G5-94 [32]. The open-circuit potential (Ecorr) was measured after 10 min, and then the potentiodynamic test was conducted at a scan rate of 0.17 mV/s [14]. The potentiodynamic test was continued till the sample reached the final potential 2 V. The final potential 2 V was selected on the basis of maximum potential used in the Pourbaix diagram of carbides [27,28].…”

“…So according to the nature of electrolyte, there would be a switch between the noble and active potentials. Other investigators found that in acid [1,[8][9][10][11][12] and neutral [8,[14][15][16][17][18][19] solutions, corrosion was due to galvanic effect for HCWI materials. Zhang et al [13] found similar galvanic effect by conducting experiments on carbide and matrix samples.…”

“…Similarly, the studies conducted for HCWI in acidic [1,[8][9][10][11][12][13] and neutral [8,[14][15][16][17][18][19] environments proposed that preferential corrosion of eutectic austenite or martensitic matrix occurred due to the formation of galvanic cell between carbides and eutectic austenite or martensite matrix. Zhang et al [13] conducted experiment at pH 1.5 acidic solution by separating carbides and eutectic austenite matrix from HCWI hardfacing alloys.…”