This paper presents the results of studies of high-alloyed white cast iron modified with lanthanum, titanium, and aluminium-strontium. The
samples were taken from four melts of high-vanadium cast iron with constant carbon and vanadium content and near-eutectic
microstructure into which the tested inoculants were introduced in an amount of 1 wt% respective of the charge weight. The study
included a metallographic examinations, mechanical testing, as well as hardness and impact resistance measurements taken on the obtained
alloys. Studies have shown that different additives affect both the microstructure and mechanical properties of high-vanadium cast iron.
The resistance of cast iron to abrasive wear depends on the metal abrasive hardness ratio. For example, hardness of the structural
constituents of the cast iron metal matrix is lower than the hardness of ordinary silica sand. Also cementite, the basic component of
unalloyed white cast iron, has hardness lower than the hardness of silica. Some resistance to the abrasive effect of the aforementioned
silica sand can provide the chromium white cast iron containing in its structure a large amount of (Cr, Fe)7C3 carbides characterised by
hardness higher than the hardness of the silica sand in question. In the present study, it has been anticipated that the white cast iron
structure will be changed by changing the type of metal matrix and the type of carbides present in this matrix, which will greatly expand
the application area of castings under the harsh operating conditions of abrasive wear. Moreover, the study compares the results of
abrasive wear resistance tests performed on the examined types of cast iron. Tests of abrasive wear resistance were carried out on a Miller
machine. Samples of standard dimensions were exposed to abrasion in a double to-and-fro movement, sliding against the bottom of
a trough filled with an aqueous abrasive mixture containing SiC + distilled water. The obtained results of changes in the sample weight
were approximated with a power curve and shown further in the study.
Consecutive casting of bimetallic applies consecutive sequences of pouring of two materials into a sand mold. The outer ring is made of NiHard1, whereas the inner ring is made of nodular cast iron. To enable a consecutive sequence of pouring, an interface plate made of low carbon steel was inserted into the mold and separated the two cavities. After pouring the inner material at the predetermined temperature and the interface had reached the desired temperature, the NiHard1 liquid was then poured immediately into the mold. This study determines the pouring temperature of nodular cast iron and the temperature of the interface plate at which the pouring of white cast iron into the mold should be done. Flushing the interface plate for 2 seconds by flowing nodular cast iron liquid as inner material generated a diffusion bonding between the inner ring and interface plate at pouring temperatures of 1350 °C, 1380 °C, and 1410 °C. The interface was heated up to a maximum temperature of 1242 °C, 1260 °C, and 1280 °C respectively. The subsequent pouring of white cast iron into the mold to form the outer ring at the interface temperature of 1000 °C did not produce a sufficient diffusion bonding. Pouring the outer ring at the temperature of 1430°C and at the interface plate temperature of 1125 °C produced a sufficient diffusion bonding. The presence of Fe3O2 oxide on the outer surface of the interface material immediately after the interface was heated above 900 ⁰C has been identified. Good metallurgical bonding was achieved by pouring the inner ring at the temperature of 1380°C, interface temperature of 1125 °C and then followed by pouring of the outer ring at 1430⁰C and flushing time of 7 seconds.