Effect of Cryogenic Treatment on Mechanical and Metallurgical Properties of SS410

Abstract

Martensitic grade SS410 is used extensively for manufacturing of turbine blades and other hydro-machinery components. During working of such components, due to poor mechanical properties of the material, the components lose its functionality and life of such components decreases. In this regard, the improvement in the material properties is essential, to enhance the life of such components. For improving the mechanical and metallurgical properties of the material, deep cryogenic treatment (DCT) can be effectively used. In this research work, DCT followed by tempering at two temperatures 350 and 250 °C has been performed on SS410. The SS410 specimens with and without DCT were tested for tensile strength, toughness, and micro-hardness. It has been observed that DCT followed by post-tempering at 250 °C has shown better results in terms of ultimate tensile strength (UTS) and micro-hardness as compared to its counterparts. This may correspond to the conversion of retained austenite to martensite and formation of fine secondary carbides.