Friction and Wear Performance of W-Ni-Fe-Co Coating Electrospark Deposited on CrNi3MoVA Steel
YANG Junbao1, GUO Qiuping2, ZHAO Boyuan3, JIN Hao1,4, GUO Ce’an1, ZHANG Jian1
1 School of Equipment Engineering, Shenyang Ligong University, Shenyang 110159; 2 Department of Military Representatives in 474 Factory, Fushun 113003; 3 65186 PLA Troops, Tieling 112609; 4 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870
Abstract: In order to further expand the route to harden gun bore, a W-Ni-Fe-Co alloy, prepared by powder metallurgy technology, was used as electrode to electrospark deposit on a CrNi3MoVA steel substrate. Meanwhile, a hard chromium coating was also plated on a CrNi3MoVA steel substrate for comparison. The performance of friction and wear of both coatings was tested by nanoindentor and friction and wear testing machine. Moreover, the phases, morphology and compositions of the deposited and worn coatings were analyzed by XRD, SEM and EDS. The results showed that the W-Ni-Fe-Co coating is composed of α-W distributed as bright band, γ-Fe and NiWO4. The hardness of the W-Ni-Fe-Co coating reduced 18% than that of the hard chromium coating whilst the elasticity modulus increased 4%. The wear mechanism of the W-Ni-Fe-Co coating is characterized as slight adherent wear while that of the hard chromium coating is severe one. In contrast to the hard chromium coating, the W-Ni-Fe-Co coating electrospark deposited on the CrNi3MoVA steel has an obvious function of antifriction and wear resistance, and what′s more, the friction coefficient is reducing with the increase of the friction velocity due to the enhancement effect of oxide self-lubricating with the aggravation of the worn surface.
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2017, Vol. 31 
