A STUDY OF HARDNESS AND MICROSTRUCTURE OF A ROBOT DEPOSITED WAAM COMPONENT WITH VARYING WIRE FEED RATE IN THE BUILD DIRECTION

admin July 23, 2020

Authors:

P. Satish Kumar,L. Suvarna Raju,M. Ravi Kumar,L. Siva Rama Krishna,

DOI NO:

https://doi.org/10.26782/jmcms.2020.07.00045

Keywords:

Hardness, Microstructure,Wire Arc Additive Manufacturing,

Abstract

Wire Arc Additive Manufacturing an arc based metal additive manufacturing creates 3D components with layer by layer weld depositions has a lot of advantages over powder based techniques and has the capability of fabricating medium to large components . The present work focussed on the study of the microstructure and hardness for wall structure fabricated by weld depositions based on Wire Arc Additive Manufacturing technique with different wire feed rates utilized from bottom to top in the build direction. Component fabricated is with 3 slabs with different wire feed rate in each slab and these slabs are deposited with multiple beads and multiple layers by using ABB 6 – AXIS Industrial Robot 1520ID. It is observed that internal matrix irrespective of slabs has insignificant variations in the hardness of the material in the build direction. The microstructure characterization exposes typically a homogenous polygonal ferrite with perlite. In general the overall process looks to be stable with negligible hardness variation. The core idea of this paper is to understand the microstructure and hardness of as-built WAAM components with varying feed rates.

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