Surfacing wear-resistant liner

For composite wear-resistant plates, temperature changes during the production and processing process will directly affect the overall performance of the plate. Therefore, the effects of temperature treatment such as wear-resistant plates have been studied, and it has been found that under different heating temperatures, the Continuous cooling transition curve, microstructure, phase and similar structural phase will also change.

Research methods for isothermal treatment of wear-resistant plates include optical microscopes, transmission electron microscopes, X-ray diffractometers, and electron backscatter diffraction techniques. With the increase of the annealing temperature, the comparison between the wear-resistant plate and ferrite will gradually decrease, and the increase is bainite, and the remaining austenite is elliptical and striped in the ferrite grain boundaries and grains. in.

In the continuous cooling-transition curve of the wear-resistant plate manufacturing process, when the heating temperature drops from the fully austenitizing temperature to a higher temperature in the two-phase region, the ferrite transformation region shifts to the left. At this time, only 790°C heating and heat preservation are required to obtain a multiphase structure of ferrite, bainite and retained austenite.

The heat insulation temperature further increases, and the heat insulation time will directly affect the ferrite grain size, the volume of the ferrite and the dislocation density and precipitation amount on the ferrite matrix in the wear plate; as the heat insulation time increases , The volume fraction of retained austenite in the wear plate first increases and then decreases, and the carbon content in the retained austenite increases.

Heating in the two-phase region, as the heating temperature decreases, the ferrite transformation is delayed and the carbon-containing austenite changes. During the same tensile deformation period, the growth rate of austenite conversion rate is different, which causes the continuous cooling transformation curve of the wear plate to shift to the right.

When the isothermal time is the same, as the isothermal temperature increases, the carbon content in the retained austenite increases, and the ferrite, bainite grain boundaries in the wear-resistant steel plate or the large-grain austenite above 1μm transform , Its nature also changes accordingly.

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