Hydroabrasive Wear Research Articles

Effect of processing factors on the mechanical properties of sintered TiC-Ni-Co-Cr alloys

Variation in the processing parameters involved in the manufacture of a TiC-base sintered hard alloy with a Ni-Co-Cr binder changes its static strength about one and a half to twofold, its dynamic strength threefold, and its resistance to abrasive and hydroabrasive wear two- to fourfold.

Modeling hydroabrasive wear in a toroidal tube

Modeling hydroabrasive wear in a toroidal tube

Effect of structure on hydroabrasive wear in high-chromium cast irons

Effect of structure on hydroabrasive wear in high-chromium cast irons

Reducing abrasive wear in hydraulic equipment

1. The type of hydroabrasive wear of a soil pump depends on the size, hardness, and roundness of the particles of the pumped materials. When pumping gravelly soil, the most intense wear is primarily on the inlet edges of the rotor blades and the casing; when pumping sandy materials, the greatest wear is at the outlet edges of the rotor blades and the armor disks. 2. It is inefficient to use a worn soil pump owing to the reduction in its energy indices: the soil output is reduced by 30% or more, the pressure head falls, and the power consumption correspondingly increases. 3. Various measures to reduce the rate of wear of a soil pump enable us to improve the use factor of the equipment during hydromechanization by 0.5–5%, to increase its output, to reduce power consumption, and finally to cut down the cost of the work. Experiments have shown that the service lives of soil pumps can be increased by increasing the wear resistance of the materials used to make them — by building up compounds with hard wear-resistant alloys, by rubberizing the working surfaces, by using wear-resistant coatings, by heat treatment of the components, and by using pump designs which ensure that the various elements in the flow duct will wear equally. 4. Experience at the Gidromekhanizatsiya Trust of the Ministry of Energy of the USSR has shown that at present the greatest reduction in hydroabrasive wear can be achieved by using rotors cast from steel 30KhNML.

Hydroabrasive wear of metals in alkaline media

Hydroabrasive wear of metals in alkaline media

Effect of heat treatment on the properties of high-chromium cast iron

1. Austenite in high-chromium cast irons is stable up to 500°. At higher temperatures the austenite begins to decompose, causing changes in the hardness, wear resistance, and mechanical properties. 2. The resistance of high-chromium cast iron to hydroabrasive wear is minimal in the cast condition and in the annealed condition. 3. To improve the machinability the alloys should be annealed at 800–900°, which lowers the hardness to HRC 32-35. 4. The resistance to hydroabrasive wear is highest after normalization at 1100°.

Factors governing the mechanism of hydroabrasive wear

Factors governing the mechanism of hydroabrasive wear

Mechanism of hydroabrasive wear of pipelines

Mechanism of hydroabrasive wear of pipelines

Hydraulic transport of a mixture of coarse material and clay

1. Addition of clay to coarse material greatly reduces the critical velocity of a hydraulic mixture and the specific frictional head losses. A decrease in the velocity of hydraulic transport may reduce by a factor of 1.5–2 the wear on pipes and equipment; this markedly increases the efficiency of the hydraulic transport setup. 2. A decrease in the specific frictional head losses and an increase in the transporting capacity of the flow play a major role in reducing the energy consumption of the plant. This enables us to increase the consistency of the hydraulic mixture and to transport hydraulic mixtures of higher consistencies for the same energy consumption. 3. It is necessary to perform much experimental research on the hydraulic transport of mixtures of coarse sand and clay, and mixtures of coarse material and clay; this should include determination of the hydraulic transport parameters, the physicochemical properties of the material being transported, and the effect of the percentage content of clay in the solid material on hydroabrasive wear of the pipes and equipment. 4. The use of a clay-water mixture as a transport medium might open up an extensive future for the hydraulic transport of very abrasive ashy-slaggy materials, etc.; this would increase the service life of the pipes and equipment.

Effect of the surface finish on the development of hydroabrasive wear

Effect of the surface finish on the development of hydroabrasive wear