Wear-resistant surfacing equipment This article analyzed the phase composition of a 75-hour ball-milled product after annealing at 900 °C. Combined with the thermodynamic analysis and crystallographic analysis of the Miedema theoretical model, it was proposed that Ni31Si12 is a metastable phase; The ball-milled product of the metal-resistive composite steel plate should strictly belong to a metastable “Ni3Si-type disordered compound†with higher energy, which is consistent with the view of some researchers that the substance belongs to the Ni-based “oversaturated solid solutionâ€. The difference.
In order to study the effect of electric pulses on eliminating the internal residual stress of metal composite surfacing composite wear liners, high-energy electric pulses are generated through the discharge of storage capacitors, and the quenched 45-grade carbon structural steel cold-rolled sheet parts are subjected to discharge treatment. The hole method measures the variation law of the residual stress in the sample before and after the electric pulse treatment. The pulse current used in the electric pulse treatment is an exponentially decaying oscillating waveform while satisfying the first main peak current density is 12.2kA/mm2, single treatment. The duration of the oscillation pulse is less than 0.8ms. The test results show that after the electric pulse treatment, the amplitudes of the two main directions of residual stress in the hardfacing parts of the surfacing composite wear-resistant lining plate are significantly reduced, and both of them appear to be equal. Effect.
A mathematical model of the temperature field in the three-dimensional transformation hardening process of a surfacing composite wear-resistant liner under the action of a moving electron beam Gaussian heat source was established. The influence of heat source distribution, thermal properties, and thermal radiation on the temperature field was considered during the analysis. The distribution law of the temperature hardening field of electron beam scanning and the shape of the hardened layer were obtained and verified by experiments. The influence of the electron beam processing parameters on the depth and width of the hardened zone was discussed. The results show that: The temperature distribution isoline of the moving electron beam Gaussian heat source of the surfacing composite wear-resisting liner is spoon-shaped. The maximum temperature at the surface lags behind the center of the beam. After treatment, the cross-section of the hardened layer is crescent-shaped; in the solid phase Under variable conditions, the width and depth of the hardened layer of the surfacing composite wear-resistant lining increase nonlinearly with the increase of the scanning power and decrease nonlinearly with the increase of the scanning speed.
Based on the explicit analysis module of Abaqus finite element analysis software, a simplified three-dimensional calculation model for friction welding homogenous joints of surfacing composite wear-resistant liners was established, and the temperature field and axial shortening of joints during friction welding were studied. Changes were analyzed and the effect of vibration frequency in the process parameters on the welding results was analyzed. The results show that the center temperature of the welding interface rises to 800°C within 1 s, and then the interface temperature slowly rises to about 950°C. With the progress of the welding process, the temperature field at the welding interface of the surfacing composite wear-resistant lining is uniform and the axial shortening amount is obtained. Increasingly, a large amount of material was extruded to form flashes. Finally, the simulation results are compared with the test results to verify the reliability of the calculation model.
As with other high-temperature metal silicide alloy bimetallic wear resistant composite steel sheets, high room temperature brittleness and low high temperature strength of nickel-silicon high temperature ordered alloy bimetallic wear resistant composite steel sheets have been the focus of attention. In this paper, Ni3Si powder alloys, bulk alloys and their Ni/Ni3Si composites were prepared by high-energy ball milling, hot-press sintering and vacuum smelting for Ni3Si high-temperature ordered alloy bimetallic wear resistant composite steel plates. The microstructures and properties of the bimetallic wear resistant composite steel plates of various test materials were tested, and the relationship between them was analyzed theoretically and discussed.
The bimetallic wear resistant composite steel plate mainly obtains some new insights as follows: (1) X-ray diffraction (XRD) and scanning electron microscopy (SEM) are used for ball milling of 3Ni/Si mixed powders with different milling time. The phase evolution and microstructure were analyzed. The results show that the Ni31Si12 phase appears in the powder product after 1h of ball milling, and then the peak strength of the Ni31Si12 phase first increases and then decreases. With the further extension of the milling time, the peak intensity of the diffraction peak of the mixed-powder-grinding product phase sharply decreases and gradually decreases. In amorphization, when the ball milling time reaches 45 h, a new diffraction peak appears again in the diffraction peak position of the Ni element powder, and the peak intensity of the peak gradually increases and broadens as the milling time increases.
In this paper, by analyzing the phase composition of the 75-hour ball-milled product after annealing at 900°C, combined with the thermodynamic analysis and crystallographic analysis of Miedema's theoretical model, it is proposed that Ni31Si12 belongs to a kind of metastable phase; at the same time, this paper considers the 75-hour bimetal wear-resistant composite steel plate. The ball-milled product should strictly belong to a kind of metastable "Ni3Si-type disordered compound" with higher energy, which is different from some researchers' view that this phase belongs to the Ni-based "oversaturated solid solution".
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