Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2012 - zeszyt 1

The properties and microstructure of austenitic stainless steels reinforced with Al2O3 particles

Iwona Sulima

nr katalogowy: 68015

Iron base alloys or steels have been used as matrix materials for metal matrix composites, owing to their lower cost, versatility and adequate mechanical and wear properties. The austenitic stainless steels grades have superior corrosion resistance and tensile ductility. However, they have relatively poor wear resistance, the cause of their low hardness. The addition of hard ceramic particles into stainless steels provides a more practical way of increasing the mechanical properties of steels [1÷3]. The hard compounds play a very important role in determining the corresponding mechanical properties of composites such as hardness. Ceramic particles which have been proposed for use as reinforcement in iron-based composites include carbides (TiC, WC, Cr3C2 etc.), oxides (ZrO2, Al2O3, Y2O3), nitrides (TiN, Si3N4) and borides (TiB2, ZrB2) [4÷7]. One of these, Al2O3 is the most commonly used reinforcement because has low density, the high hardness and Young’s modulus, and the high melting point. This ceramic exhibits the high chemical stability, good wear resistance, excellent oxidation resistance and outstanding mechanical properties at high-temperature [8]. In recent years, the research concerning the influence of the Al2O3 and Y2O3 ceramics on the properties of the stainless steels was realized. These tests were carried out using the high temperature sintering techniques. Vardavoulias et al. [9] investigated the dry sliding wear behaviour of two P/M austenitic stainless steels (AISl 304L and 316L) and their composites containing two different types of ceramic particles (Al2O3 and Y2O3) using different sintering activators (BN and B2Cr). To obtain the highest values of density for austenitic stainless steels reinforced with the ceramic particles Y2O3 ceramic and B2Cr sintering activator are used. The addition of ceramic particles positively effected on the wear behaviour of both types of stainless steels. In the case of AISI [...]

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