Owing to its fairly higher melting point (2468°C) and superior thermal conductivity, Niobium alloys are rendered as candidate material for high temperature applications, where state of the art Nickel base super alloys cannot be used. Its applications possess wide range of aerospace components mainly encompassing aircraft exhaust chambers, thrust augmenters, rocket engines and other industries such as chemical and petrochemical. The only limitation with niobium alloys is their inferior oxidation resistance, which can be tackled by developing a high temperature oxidation resistant coating. In this regard, Nickel Aluminide (NiAl) having a melting point of 1638°C embraces a paramount importance amongst the coating categories. In this study, NiAl was synthesized using vacuum melting and strip casting followed by ball milling. The powder was coated on C-103 Niobium alloy specimens using air plasma technique and evaluated for high temperature stability. It was deduced that the coating was exceptionally stable up to 1234 °C in ambient conditions.
One of the prime mechanical properties of any steel is impact strength, which may change dramatically due to the thermal treatments. The present investigation covers the influence of different thermally treated conditions on the impact strength of AISI 1020 steel. The thermal conditions included are: as rolled, oil quenched & tempered, air quenched, normalized and annealed condition. To evaluate the characteristics of the steel in different thermal conditions; optical microscopy, scanning electron microscopy, hardness testing and room temperature impact testing were carried out. Experimental results elaborated the existence of a narrow temperature range (250 ± 50 °C), which may decrease the impact strength drastically, when the steel is heat treated. In this temperature range toughness scavengers i.e., As, S, Sb etc. are precipitated on the grain boundary, which cause the noticeable decrease in impact strength. Optimum impact strength could be achievable where this critical temperature range was avoided.
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