Abstract
Maraging steel is an alloy of Ni-Fe having very low carbon content. These steel is having superior properties like toughness and strength without losing its malleability. In the present work 5mm thick Maraging steel plates were welded using GTAW process with maraging steel filler wire. This paper attempts to analyse the microstructure and mechanical properties of the weldment. Post weld heat treatment (PWHT) was carried out at 480°C. Strength of welded joint of as-weld and PWHT was tested using ultimate tensile machine (UTM). Both the tensile specimen (As-weld and PWHT) breaks at base metal zone. The quality of joint at micro-level was analysed using optical microscopy. PWHT sample have finer grain compare to weld sample. Different phases transformation was observed in microstructures. Microhardness was also observed at different location in and around the joint. It was also observed that the fusion zone and heat affect zone (HAZ) of PWHT has higher value of Microhardness compare to weld sample.
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