Microstructural characterisation of laser beam and gas tungsten arc welded zirconium-2.5Nb
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Date
Authors
Pistorius, Pieter Georg Hendrik
Journal Title
Journal ISSN
Volume Title
Publisher
Southern African Institute of Mining and Metallurgy
Abstract
The current study is intended to characterise the complex microstructure
that results from autogenous welding of Zr-2.5Nb and its influence on
mechanical properties. Laser beam welding (LBW) and gas tungsten arc
welding (GTAW) were performed on a 1.5 mm thick samples by applying
different combinations of speed and power to vary the heat input. The
effect of cooling rate on β-α phase transformation temperature and the
resulting microstructure was investigated using a Bahr dilatometer. In
addition, mechanical properties were determined by tensile and hardness
testing. The base metal microstructure consisted of a fine structure of Zralpha
with a small fraction of Nb-beta phase. Both LBW- and GTAWwelded
joints displayed similar martensitic microstructures, with the main
difference being the weld geometry and strength.
Description
This paper
was first presented at the AMI Precious Metals
2017 Conference ‘The Precious Metals
Development Network’ 17–20 October 2017,
Protea Hotel Ranch Resort, Polokwane, South
Africa.
Keywords
Zr-2.5Nb, Autogenous welding, Microstructure, Laser beam welding (LBW), Gas tungsten arc welding (GTAW), Mechanical properties, β-α phase transformation temperature, Cooling rate
Sustainable Development Goals
SDG-09: Industry, innovation and infrastructure
SDG-12: Responsible consumption and production
SDG-13: Climate action
SDG-12: Responsible consumption and production
SDG-13: Climate action
Citation
Mahlalela. S.S. & Pistorius, P.G.H. 2017, 'Microstructural characterisation of laser beam and gas tungsten arc welded zirconium-2.5Nb', Journal of the Southern African Institute of Mining and Metallurgy, vol. 117, pp. 947-953.