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Experimental and Computational Determination of the Wear Resistant Coefficient for Coatings with Nanodispersed Carbide Particles Added by Laser Surfacing
Russian Journal of Non-Ferrous Metals ( IF 0.8 ) Pub Date : 2020-12-28 , DOI: 10.3103/s1067821220060048
V. P. Biryukov , T. A. Bazlova

The results of domestic and foreign investigations into the laser surfacing of coatings containing a strengthening carbide phase, as well as metallographic and tribological investigations of coatings by alloy powders of the Ni–Cr–B–Si system, including the addition of nanodispersed titanium and tungsten carbide particles, are presented. Values of the wear resistance coefficient (Kw) of coatings during abrasive wear testing according to the Brinell–Haworth scheme are determined. The use of Kw makes it possible to determine coefficient C when performing a scratch test of the coatings, which depends on the coating hardness, treatment modes, and addition of solid particles. It is found that the magnitude of C is affected by a series of factors such as the processing speed, input laser power density, base melting depth, and carbide phase presence and content. The larger the melting depth is, the lower the coating wear resistance is, which is associated with mixing the base material and surfaced coating. Introducing tungsten carbide nanoparticles in an amount from 3 to 7% makes it possible to increase the coating wear resistance by a factor of 1.5–2.0 when compared with the surfaced powder coating made of the PR-HKh15SR2 alloy and by a factor of 4.6–7.1 with respect to the base material—steel 40Kh. Microhardness of the initial powder is 6400–6600 MPa and increases with the introduction of carbides into it. For example, microhardness reaches 7620–9160 MPa with a WC content of 7% in the coating. Positive surfacing results are found with the emission power density up to 50 W s/mm2, but its further increase leads to the burnout of alloying elements and dissociation of carbides.



中文翻译:

激光堆焊添加纳米分散硬质合金颗粒涂层的耐磨系数的实验和计算确定

国内外对含有强化碳化物相的涂层进行激光表面处理的研究结果,以及采用Ni-Cr-B-Si体系的合金粉末对涂层进行金相和摩擦学研究的结果,包括添加纳米分散的钛和钨给出了碳化物颗粒。根据Brinell-Haworth方案确定磨料磨损测试过程中涂层的耐磨系数(K w)值。K w的使用使得在进行涂层的划痕测试时可以确定系数C,这取决于涂层的硬度,处理方式和固体颗粒的添加。发现C的大小受到一系列因素的影响,例如加工速度,输入激光功率密度,基体熔化深度以及碳化物相的存在和含量。熔化深度越大,涂层的耐磨性越低,这与基材和表面涂层的混合有关。与PR-HKh15SR2合金制成的表面粉末涂料相比,引入3%至7%的碳化钨纳米颗粒可使涂层的耐磨性提高1.5-2.0倍,并且提高4.6-7.1倍。相对于基础材料-钢40Kh。初始粉末的显微硬度为6400-6600 MPa,并随着碳化物的引入而增加。例如,涂层的显微硬度达到7620-9160 MPa,WC含量为7%。如图2所示,但是其进一步增加导致合金元素的烧尽和碳化物的离解。

更新日期:2020-12-28
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