It can be seen from the figure that with the increase of tempering temperature, the hardness of 30cr13nb0.1 steel first decreases and then increases. Combined with SEM analysis, it can be seen that the change of hardness is closely related to the formation of carbides. When the tempering temperature...
The room temperature tensile strength and elongation of A1 and A2 alloys under different processes are shown in Fig. 1. It can be seen from Fig. 1 that for the alloy with the same composition, under the same extrusion pressure, the tensile strength and elongation of the ultrasonic rheological...
Fig. 1 shows the microstructure of 30cr13nb0.1 steel tempered at different temperatures. It is preliminarily judged that it is martensite and carbide. As shown in Fig. 1 (a), carbides are mainly in the form of dots and fine chains. Fig. 1 (B, c) shows that when the tempering temperature...
Fig. 1 and Fig. 2 are SEM photos of microstructure of as cast samples of A1 and A2 alloys by ultrasonic rheological squeeze casting. It can be found that the white massive iron rich phase appears in the microstructure of A1 alloy with only ultrasonic treatment and no extrusion...
Fig. 1 and Fig. 2 show the SEM photos of as cast samples of A1 and A2 alloys without ultrasonic treatment. It can be seen that the microstructure of as cast alloys mainly includes Al matrix, primary Si, coarse needle like primary iron rich phase and eutectic Si, al2cu...
The ztap / HCCI composite grinding roller was successfully prepared by splicing several preforms and fixing them at the corresponding position of the working face in the casting cavity of the grinding roller, and then pouring HCCI liquid. The roller was put into use in a domestic power plant....
Take photos of the worn sample surface, import the pictures into image Pro Plus software, and identify and select the area of ceramic particles by setting the chroma threshold area of ceramic particles, as shown in Figure 1. Then the percentage of ceramic particles in the wear samples was...
Figure 1 shows the XRD pattern of ztap / HCCI composite. The phases of the composites mainly include Al2O3 in ceramic phase, m-ZrO2 in monoclinic phase and t-ZrO2 in tetragonal phase. The main reason is that the amount of retained martensite is not detected. The carbide phase is (Cr,...
Figure (a) shows the overall metallographic structure (after heat treatment) of ztap / HCCI composite under optical microscope. The microstructure of the composite can be divided into HCCI matrix sintered in the composite zone and HCCI matrix formed by casting ztap and columnar zone. In the figure, the light...
The macro morphology of the preform is shown in figure (a). After sintering, ztap is fully wrapped by HCCI to form a honeycomb structure. The diameter of the middle through-hole is 20 mm, which can increase the contact area between molten iron and the preform during the casting process,...