Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Mechanical alloying of Astaloy CrL powders with silicon

nr katalogowy: 52719

It is well known that in the competition between wrought and Powder Metallurgy (PM) steels, sintered materials are at an extreme unbeneficial due to the deleterious effect of porosity on mechanical properties such as tensile strength, ductility and impact toughness. Furthermore, the increased alloy level in powder mixture is disadvantage due to their negative effect on compressibility. For this reason it is very important to try to explore non traditional strengthening mechanism for sintered steels [1]. Recently it was discover that bainitic-austenitic dual phase steels containing silicon are known to posses high toughness thanks to the presence of a finely dispersed retained austenite in a carbide free bainitic matrix. The absence of carbides in retained austenite is due to the effect of silicon on the bainitic transformation. Such a microstructure is expected to improve the mechanical properties of porous sintered steels. High strength bainitic steels have not been as successful in practice as quenched and tempered martensitic steels, because the coarse cementite particles in bainite are unbeneficial. However, the precipitation of cementite during bainitic transformation can be suppressed by alloying the steel with about 1.5 wt. % Si, which has very low solubility in cementite and greatly retards its growth from austenite [2]. The addition of silicon to steel enables the production of a distinctive microstructure consisting of a mixture of bainitic ferrite, carbon enriched retained austenite, and some martensite [3], thereby stabilizing it down to ambient temperature. The amount of retained austenite present in microstructure depends on the composition, cooling rate, austenite morphology and annealing temperature and time. The silicon suppresses the precipitation of brittle cementite, and hence should lead to an improvement in toughness. However, the full benefit of this carbide free bainitic microstructure has frequently no[...]

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