Hard and wear resistance TiC-composite coating on AISI 1020 steel using powder metallurgy tool by electro-discharge coating process

Abstract

TiC-Cu tool electrode prepared by the powder metallurgy route has been used to deposit TiC coating on AISI 1020 mild steel by the electro-discharge coating (EDC) process. Different ratios of TiC and Cu were considered to make a tool electrode that enables to produce acceptable quality coating. The effect of peak current and pulse duration during the EDC process was analyzed for the deposition rate and surface characteristics of the coating. The microhardness of the coated surface was measured by Vickers microindentation tester and microstructure of the deposited layers was studied by scanning electron microscopy (SEM). The elements present in the coating were analyzed through energy-dispersive spectroscopy (EDS), and the compounds formed during the coating process were identified by the XRD technique. The wear rate of the coated samples was measured through ball-ondisc-type sliding wear test against WC-Co ball. Analysis of the experimental results revealed that a higher peak current during the EDC process augmented the microhardness and wear resistance of the coating.

Electric discharge coating process: a critical review with potential application

“…Also, it inferred that the lower compaction load and reverse polarity is suitable for a higher material transfer rate. Tijo D et al [72] experimentally investigated the various composition of tool electrodes on the same substrate. Uniform blending of constituent powder materials has to considered while preparing green compact electrodes which creates a uniform coat on the substrate.…”

Effect of parameters on microstructure of electrical discharge coated ZE41A magnesium alloy with tungsten carbide-copper composite electrode

“…Material deposition rate, surface roughness and micro hardness were achieved successfully in the optimized parameters. Tijo et al [11] increased the wear resistance of AISI 1020 steel surface coated with TiC and Cu composite electrode. Rao et al [12] modified the D2 die steel with WC/Co powder composite electrode by electrical discharge alloying techniques.…”

“…Roughness of 1.65-5.82 μm and hardness of 981 HV were successfully achieved at medium compaction pressure of 350 MPa. Tijo et al [13] have deposited TiC-Cu composite coating on AISI 1020 steel surface using electrical discharge coating techniques. Electrodes were prepared with 60% of TiC and 40% of Cu using powder metallurgical technique.…”

EDMed Inconel 718 using powder metallurgy (P/M) sintered electrode made with nano and micron sized powders

“…In this process, a series of discrete electrical discharges occur between tool and work piece electrodes which are immersed in a dielectric fluid. Due to high temperatures generated during the process, it melts and partially vaporizes the material at the point of discharge [8][9][10]. A material removal takes place from both the electrodes in which a part of molten metal from the electrode and constituents of the dielectric migrate and deposit on the work piece.…”