Browsing by Keyword "Austenitic steel"
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Item Reinforcement of austenitic manganese steel with (TiMo) carbide particles previously synthesized by SHS(2009) Erauskin, Jose Ignacio; Sargyan, Ara; Arana, Jose Luis; Centros PRE-FUSION TECNALIA - (FORMER)The austenite of the Hadfield type manganese steels (1.0-1.4% C; 12-14% Mn), even though able to be hardened by impact, explosion, etc., is very ductile, tough and deformable, so that the industrial parts made with this material often suffer important geometric deformations during service. To minimize this problem, it is necessary to reinforce the austenitic matrix with hard, microscopic and dispersed ceramic particles, such as TiC, in order to increase the austenite stiffness while maintaining its toughness. Indeed, the development of a liquid metallurgy process enabling the reinforcement by means of the addition of the ceramic material to the molten metal in the melting furnace would become an important advance in this field. Nevertheless, these ceramic products are prone to the coalescence and have poor wettability by the molten bath, so that, their yield and the subsequent property improvement is very low. These disadvantages are solved if the ceramic particle is a complex carbide (TiMo)C bonded by metallic Fe, having a masteralloy of the Fe(TiMo)C type made by self-propagated high temperature synthesis (SHS). After that, its addition to the liquid austenitic manganese steel, the pouring of the mix (steel+carbides), its solidification, for example in sand molds, and the subsequent heat treatment (solution annealing and rapid quenching) produces composite castings or parts composed by an austenitic matrix and discrete carbide (TiMo)C particles inserted in it. This paper describes the process required to fabricate such a material and its characteristics.Item The use of new essay techniques to investigate the behaviour of austenitic steels with nano-alloys(World Foundry Organization, 2014) Caballero, P.; García, J. C.; PROMETAL; CIRMETALThe search for new applications of austenitic steel obliges us to develop new essay techniques which accept the addition of new nanoalloys and allow comparison with standard steels. The new essay techniques must facilitate the study of alterations, segregations and carbides in experimental nanoalloys. New applications will require new micro and macro structural characteristics; however, as the basic austenitic steel structure cannot be radically changed, obtaining improved mechanical properties is the challenge. Future uses of austenitic steel, due to its critical nature in diverse areas such as the aerospace industry and the electromagnetic sector, will require stringent controls. In order to meet these demands, new essay techniques are required. The successful development of new alloys depends on finding the correct element proportions and grain size of the nanoalloys to be added. Through the precise management of the basic steel and nano element mix, beneficial segregations, in both mechanical and rheological terms, can be produced for current and new applications. Thanks to its low cost and probable future use in a wide range of applications, our trials were conducted with manganese steel which was found to be a representative reference type for austenitic steel in general. Using X-ray diffractometry and cyclical fatigue, we have been able to demonstrate that each nano element can be assigned a specific residual tension. Based on this we have produced a table of mechanical properties by nano type which shows the effect of nano addition on the residual tension of the cast steel produced, and, consequently, on the mechanical properties of the experimental alloys. This allows the identification of the most appropriate alloy for both highly specific future and conventional applications of austenitic steels.