In this study, HSLA steel cylindrical component was fabricated using Cold Metal Transfer (CMT)- WAAM process which is often produced by casting process for marine application and the metallurgical characteristics were analysed by optical microscopy, scanning electron microscopy, energy dispersive X-ray analysis and X-ray diffraction techniques and its influence on mechanical characteristics such as tensile properties, microhardness and impact toughness were studied.

The analysis and testing were carried out in the structure as two regions (namely: Top and Bottom).

The microstructure of each region was predominantly composed of acicular ferrite, polygonal ferrite and bainitic structure.

The mechanical properties of the bottom region show an increase in the properties than the top region due to the faster cooling rate experienced at the bottom region. The ultimate tensile strength (UTS), yield strength (0.2% YS), elongation and microhardness of the bottom region show an increase of 2.5%, 2.6%, 6.89% and 15% than the top region.

The impact toughness of the bottom region 9.85% inferior to the top region. Similarly, when comparing between component produced using CMT- WAAM and the cast component, the WAAM component showed an 8.24% increase in UTS and 16.2% increase in yield strength than the cast component.

This article is shared by B. Prabhakaran, P. Sivaraj, S. Malarvizh and V. Balasubramanian