The former Soviet Union, Germany, the United States, Japan and other countries have conducted a lot of research on aluminum-containing gray cast iron and aluminum-containing ductile iron. The results show that the aluminum-containing gray cast iron and the aluminum-containing ductile cast iron have a small tendency to chill, and can be used for wall thickness. Thin castings have good resistance to alternating temperature, good oxidation resistance and high temperature strength. However, it is generally believed that the addition of aluminum to cast iron will increase the brittleness and affect its comprehensive mechanical properties. There are few reports on this aspect in China. In this paper, the changes of microstructure and properties of gray cast iron after adding different content of aluminum were studied, and the influence of aluminum on the microstructure and properties of gray cast iron was discussed.
1. Test conditions and methods
(1) Casting and casting of cast iron is smelted in medium frequency induction furnace, aluminum element is added by furnace, and the temperature is 1400-1500 °C. The inoculant is added by the bottom punching method. After pouring the slag, the pouring temperature is poured. 1350 ~ 1400 ° C, control the amount of aluminum added, to obtain four different aluminum content of gray cast iron, numbered 1 #, 2 #, 3 #, 4 #, the chemical composition of which is shown in Table 1. The shape of the round bar specimen is φ 30mm×300mm.
(2) Mechanical properties and metallographic examination of cast iron The round bar is processed into standard tensile and impact specimens of cast iron, and the tensile test is completed on a 100kN universal testing machine. The impact performance is tested on the impact testing machine and then pulled off. Sampling on the sample, at
The hardness test was carried out on a HB-3000 Brinell hardness tester, and the metallographic examination was carried out using an OLYMPUS GX51F metallographic microscope.
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