Operational properties and local wear mechanisms of hard alloys alloyed by tungsten nano carbide under turning
Journal Title: Вісник Тернопільського національного технічного університету - Year 2015, Vol 79, Issue 3
Abstract
Operational properties of the titanium carbide based hard alloys alloyed by vanadium carbide (5% (wt.) and tungsten nano carbide (5, 10, 15% (wt.) with nickel-chromium binder (18% (wt.) under turning were researched in the paper. The processing of construction carbon and alloyed steels under shoulder and facing turning by inserts made of developed alloys was carried out. The tool life at semi- finishing and finishing turning operations was identified and the critical (maximum) cutting speed at which the critical inserts wear takes place was determined. It was shown that the application of tungsten nano carbide results in the increase of cutting tools wear resistance as the alloys with nano WC tool life is 109…154 min and exceeds that of conventional carbide based hard alloys, tungsten-free hard alloys and polycarbide based alloys alloyed with fine-grained tungsten carbide. The critical cutting speed the alloy with 5% (wt.) nano WC is 830 m/min and for the one with 15% (wt.) is 980 m/min. The features of local wear of alloys alloyed by tungsten nano carbide were studied taking advantage of the electronic microscopy and chemical analysis methods. The analysis of the wear zone showed that it consists of two areas, the tribolayer, containing a significant amount of oxygen and the elements of instrumental and processed materials, and abrasive wear area. It was determined that the abrasion wear is the main local wear mechanism of researched alloys. The main features of demage in the area of abrasive wear are large carbide grains cracking, their parts removal and small carbide grains splintering. Availability of tribolayer on the back surface of the cutting edge changes the temperature and force conditions of the tool material cutting and demage that occurs as a result of oxidation and diffusion interaction with the elements of the processed material.
Authors and Affiliations
Sergiy Marynenko, Ihor Koval, Lyudmyla Bodrova, Halyna Kramar
Keywords
Related Articles
- EP ID EP571051
- DOI -
- Views 53
- Downloads 0
Selecting cutting modes for high-speed titanium-tungsten instruments at cutting pneumatic tires
Results of experimental researches of technical processes of used pneumatic automobile tires utilization are given to determine the most effective cutting tool’s material and cutting mode during their cutting in half.
Technological conditions of diffusive boride coating formation on silicon carbide and molybdenum disilicide
Basic directions of the diffusive boride coating formation on reaction-sintered silicon carbide and molybdenum disilicide are described. Technological conditions of non-metal ceramic materials boriding depending on the c...
Experimental study of pseudoelastic NiTi alloy under cyclic loading
The phase transformation temperatures of pseudoelastic NiTi alloy were defined by differential scanning calorimetry. The effect of the stress range on the functional properties of the NiTi alloy under uniaxial tension in...
Experimental research of deformation zone of adaptive clamping elements for lathe jaws chucks
The paper deals with the experimental research of clamping surface deformation zone of adaptive clamping jaw to equip lathe jaws chucks during machining work pieces of different diameters. The directly proportional displ...
The cargo movement model by the screw conveyor surfaces with the rotating casing
The article defines regularities of the change of the angle parameter of the cargo for the case of slow-moving transport and steady motion for horizontal and hollow inclined conveyors with a rotating casing. This allows...