Effect of post-heat treatment on the microstructure and microhardness of a plasma sprayed Fe-C-Mn-Cr-W-V coating
DOI:
https://doi.org/10.31498/2225-6733.34.2017.105438Keywords:
plasma-pulse treatment, cathode, coating, carbides, microstructure, microhardnessAbstract
The article describes the effect of post-heat treatment (soaking at 950°C for 80 min with consequent oil quenching) on the microstructure and microhardness of a pulse-plasma deposited coating using heterogeneous cathodes (steel T1 and high-chromium (28 wt. % Cr) cast iron) at voltage of 4 kV and current of 10 kA. The coating was deposited by 10 pulses using electrothermal axial plasma accelerator with alternating cathode materials which provided two-layers coating of 120 mm width. Optical and electron scanning microscopy, energy dispersive spectroscopy, microhardness measurement were employed in this work. It has been shown that after the deposition the coating structure is austenite/martensite matrix with minor amount of M3C carbides and total microhardness of 500-650 HV. In the course of high-temperature soaking the supersaturated solid solution decomposes with the precipitation of dispersed particles of W-rich carbides М6С, М2С and Cr-rich carbides М7С3, М23С6, М3С2. Carbides precipitate along the grain boundaries making continuous carbide network. The formation of carbides is mainly completed within 40 minutes of holding. Carbides precipitation is accompanied by 2-3 fold increase in the microhardness of the coating. The chromium rich layer possesses higher carbides volume fraction which results in higher microhardness (1265-1750 HV) as compared with W-rich layer (1000-1300 HV)References
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Efremenko V.G., Chabak Yu.G., Lekatou A., Karantzalis A.E., Shimizu K., Fedun V.I., Azarkhov A.Yu., Efremenko A.V. Pulsed plasma deposition of Fe-C-Cr-W coating on high-Cr-cast iron: effect of layered morphology and heat treatment on the microstructure and hardness. Surface and Coating Technology, 2016, vol. 304, pp. 293-305. (Eng.)
Chabak Yu.G., Fedun V.I., Shimizu K., Zurnadzhy V.I., Efremenko V.G. Phase-structural composition of coating obtained by pulsed plasma treatment using eroded cathode of T1 high speed steel. Problems of Atomic Science and Technology. Series: Plasma Electronics and New Acceleration Methods, 2016, no. 4, pp.100-106. (Eng.)
Fenech M., Mallia B., Grech M., Betts J.C. The post-deposition heat treatment of codeposited Cr3C2 and AISI 410 stainless steel using the coaxial laser deposition technique. Journal of Materials Science, 2013, vol. 48, pp. 2224-2235. (Eng.)
Efremenko V.G., Chabak Yu.G., Brykov M.N. Kinetic parameters of secondary carbide precipitation in high-Cr white iron alloyed by Mn-Ni-Mo-V complex. Journal of Materials Engineering and Performance, 2013, vol. 22, pp. 1378-1385. (Eng.)
Karantzalis A.E., Lekatou A., Diavati E. Effect of destabilization heat treatments on the microstructure of high-chromium cast iron: a microscopy examination approach. Journal of Materials Engineering and Performance, 2009, vol. 8, pp. 1078-1085. (Eng.)
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Pierson H.O. Handbook of Refractory Carbides & Nitrides: Properties, Characteristics, Pro-cessing and Applications. Noyes Publ., 1996. 362 р. (Eng.)
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