Elevation of the Wear Resistance of Low-Alloy Structural Steel by Plasma-Powder Surfacing with Alloys Based on Iron, Chr
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ELEVATION OF THE WEAR RESISTANCE OF LOW-ALLOY STRUCTURAL STEEL BY PLASMA-POWDER SURFACING WITH ALLOYS BASED ON IRON, CHROMIUM, AND NICKEL E. F. Perepl’otchikov,1 Kh. B. Vasyliv,2,3 V. A. Vynar,2 I. O. Ryabtsev,1 and V. I. Zakiev4 We study the chemical and structural inhomogeneities and the parameters of wear resistance of the coatings obtained by the arc-welding method. The coatings were obtained from PR-KhN80SSR3, PN-AN-34, and Kh17N8S6G powders based on nickel, cobalt, and iron, respectively, and from an experimental powder based on Ni and Fe. The tribological properties of iron-based alloys are better than for the cobalt- and nickel-based alloys. In the course of friction, the austenitic component of the coating undergoes plastic deformation as a result of which it covers the surface as a lubricant, which decreases the friction coefficient and wear. Keywords: plasma-powder surfacing, powders, iron, nickel, cobalt, wear resistance.
The failure-proof operation of contemporary oil and gas pipelines and oil- and gas-extracting wells strongly depends on the reliability of pipe fittings. In turn, the reliability of pipe fittings is mainly determined by the serviceability of fused metal of the sealing surfaces of various parts of the gate. For the purposes of fusing of the indicated surfaces of the oil-and-gas-extracting fittings, it is customary to use cobalt-, nickel-, and iron-based alloys doped with boron and silicon [1–12]. The recent studies are aimed at the partial replacement of nickel and cobalt with iron, which would enable us to decrease the cost of alloying admixtures, improve the quality of the built-up metal, facilitate the conditions of fusing, and improve its efficiency [13]. The researchers of the Paton Institute of Electric Welding of the NAS of Ukraine (IEW) developed an experimental alloy containing almost identical amounts of nickel and iron (35% of each metal). It is much less costly than the nickel-based alloys. In what follows, we study the chemical and structural inhomogeneity and the parameters of wear resistance of the metals built-up by the plasma-powder method with the use of the experimental alloy and the PR-KhN80SSR3, PN-AN-34, and Kh17N8S6G powders based on nickel, cobalt, and iron. Methods of Investigations The main advantages of the procedure of plasma surfacing are the high stability of burning of the plasma arc, broad possibilities of combination of the built-up and base metals, and the possibility of separate regulation of their heating for the economically efficient improvement of the properties of materials. 1 2 3 4
E. Paton Institute of Electric Welding Ukrainian National Academy of Sciences, Kiev, Ukraine.
Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine. Corresponding author; e-mail: [email protected]. National Aviation University, Kiev, Ukraine.
Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 54, No. 3, pp. 81–88, May–June, 2018. Original article submitted December 14, 2017. 378
1068-820X/18/5403–0378
© 2018
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