Microstructural Evolution of Laser Metal Deposited 17-4 PH SS-Tungsten Composite with Varying Volume Percent Tungsten

  • A. A. Adeyemi Department of Mechanical Engineering Science, University of Johannesburg
  • E. T. Akinlabi Department of Mechanical Engineering Science, University of Johannesburg
  • R. M. Mahamood Department of Mechanical Engineering Science, University of Johannesburg
DOI: https://doi.org/10.35219/awet.2018.06
Keywords: Laser Metal Deposition, Laser power, microstructure, precipitation, hardening, stainless steel, composite, tungsten

Abstract

This study investigates the influence of the quantity of tungsten powder on the microstructural evolution of 17-4 PH stainless steel-tungsten composite produced using laser metal deposition process. The 17-4 PH stainless steel and tungsten powders were deposited on 316 stainless steel substrate at laser power of 2600 W. The tungsten powder flow rate was varied between 0.5 rpm and 2.0 rpm while 17-4 PH stainless steel powder flow rate, the scanning speed, the gas flow rate and the laser spot size were fixed at 2.0 rpm, 0.5 m/s, 2.5 l/min and 2.0 mm respectively. Five (5) multiple tracks of 17-4 PH stainless steel and tungsten powder were deposited on
316 stainless steel of 10 mm thickness from different hopper at 50% overlapping percentage to produce 17-4 PH SS-W composite. During the microstructural study, it was observed that tungsten carbide has been precipitated in-situ and evenly dispersed in the 17-4 PH SS-W composite produced. SEM and EDS analyses also revealed the presence of BCC alpha (α) ferrite and FCC gamma (δ) ferrite with the presence of sigma (σ) phase precipitates.

Downloads

Download data is not yet available.
Published
2018-12-28
How to Cite
Issue
Vol 29 (2018)
Section
Articles

Papers accepted for publication become the copyrighted property of the Annals of "Dunarea de Jos" University of Galati, Fascicle XII, Welding Equipment and Technology. No part of the publication may be reproduced or transmitted in any form, or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, except in limited quantities for the non-commercial purposes of scientific or educational advancement, without permission in writing from the Editorial Board.