Prabhu, Sandesh M and Kini, Achutha U and Sharma, S S and Gurumurthy, B M (2016) Heat treatment and mechanical characterisation Of dual phase (ferrite-martensite) medium carbon Low alloy steels. International Journal For Technological Research In Engineering, 3 (8). pp. 1776-1779. ISSN 2347 - 4718

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Abstract

Medium carbon steels which find large number of applications derive their properties mainly from the presence of carbon. These properties can be improved by heat treatment or by the addition of small amounts of specific alloying elements. By austenising these steels in the intercritical temperature range and then quenching, dual phase structure (martensitic structure with ferrite) is obtained. In this study, a medium carbon steel SAE 1040 (EN 8) is brought to the dual phase condition at different intercritical temperatures. Its mechanical properties like tensile strength, ductility, hardness and impact strength are ascertained. The same study is extended to two medium carbon low alloy steels SAE 4140 (EN 19) and SAE 4340 (EN 24). Prior to hardening, all these three steels are normalised. A comparison of the behaviour of all the three steels with regard to the mechanical properties is done in normalised condition as well as in dual phase condition to establish the influence of the alloying elements. Tensile strength and hardness were found to increase in SAE 1040 and SAE 4340 steels when austenising and quenching are decreased. In case of SAE 4140, though hardness increased, decrease in tensile strength, ductility and impact strength was observed. SAE 4340 steel was found to give optimum properties in the dual phase condition. Key words: Heat treatment, Dual phase steels, Austenising,

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