In this paper, methods for sintering ceramics from aluminum oxynitride are considered. In particular, the effect of reaction sintering and hot isostatic pressing methods is investigated. The influence of these methods on the structure and phase analysis of the obtained ceramic samples was determined.
The features of the deformation of austenitic-martensitic thin-sheet TRIP steel under static and fatigue loading with varying parameters of the breaking rate as well as the maximum cycle stress under cyclic loading were studied. The ten-fold increase in the tensile rate led to the decrease in the ultimate strength by ≈ 6% and the relative elongation δ from 32% to 21%, which is due to a decrease in the intensity of the formation of deformation martensite. The nature of hardening during deformation of steel under static and repeated tension is almost the same. The effect of the greatest TRIP - strengthening under loading to the yield-point stress level and physical fatigue limit were found. Preliminary fatigue loading up to σmax = 1550 MPa with N = 3000 led to the increase in the yield strength and ultimate strength by ≈200 MPa and ≈100 MPa, respectively; the relative elongation decreased by a factor of 2.
TRIP/TWIP steels have high tensile strength, plasticity, and much higher yield stress then other structural steels. Currently class of TRIP/TWIP steels with austenite-martensite structure is used in highly loaded parts, such as helicopter propeller torsion bars. TRIP steels are most in demand in the automotive industry. However, this steel has a problem with fatigue strength, because martensite of deformation (product of austenite-martensite transformation induced by plastic deformation) is stress concentrator. Surface modification will increase fatigue strength and ductility, as well as high corrosion resistance in aggressive environments. It is supposed to evaluate the effect of a particular chemical element or chemical compound in the interaction with steels with a high austenite content and make first steps towards to technology of Surface modification TRIP\TWIP steels.
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