Influence of Soil Humidity on the Regularities of Destruction of Low-Alloy Steel During WearPages 120-128
V. I. Dvoruk Abstract:
When moving in soils of different humidity, a mechanochemical form of abrasive wear occurs on the working surface of low-alloy steel. The role of water in the formation of wear resistance is to regulate active deformation and fatigue phenomena on the friction surface through its simultaneous cooling, adsorption and physical-mechanical effects on the properties of metal, soil and abrasive particles. The nature of the dependence of wear resistance on moisture with changes in the mechanical composition of the soil is determined by the relationships between the rates and intensities of the indicated effects of water. The influence of humidity on wear resistance in soils of different mechanical composition is carried out through the rheological-fatigue parameter in the following dependence: the greater the rheological-fatigue parameter, the higher the wear resistance of the steel. Based on this, the mechanical component of contact interaction should be recognized as determining the strength basis of the wear mechanism. During the wear process, residual tensile stresses of a plastic-destructive nature are formed on the working surface. Qualitatively, the patterns of changes in these stresses correlate with the patterns of the rheological-fatigue parameter and wear resistance. The influence of humidity on the formation of the rheological-fatigue parameter in soils of different mechanical composition is carried out mainly through fracture toughness, the size of the plastic zone in the vicinity of the crack tip and cyclic fracture toughness in the following dependencies: the higher the fracture toughness, the size of the plastic zone in the vicinity of the crack tip and The lower the cyclic fracture toughness, the greater the rheological-fatigue parameter of the steel.
Keywords: Abrasive wear,
Soil, Humidity,
Low-cycle fatigue,
Fatigue crack,
Wear resistance,
Rheological parameter,
Fracture toughness,
Size of the region of nonlinear effects,
Deformability,
Syclic fracture toughness
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