Microstructural characterisation of laser beam and gas tungsten arc welded zirconium-2.5Nb

Mahlalela, Sibusiso S.; Pistorius, Pieter Georg Hendrik

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dc.contributor.author	Mahlalela, Sibusiso S.
dc.contributor.author	Pistorius, Pieter Georg Hendrik
dc.date.accessioned	2018-07-25T08:37:25Z
dc.date.available	2018-07-25T08:37:25Z
dc.date.issued	2017-10
dc.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.	en_ZA
dc.description.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.	en_ZA
dc.description.department	Materials Science and Metallurgical Engineering	en_ZA
dc.description.librarian	am2018	en_ZA
dc.description.uri	http://www.saimm.co.za/journal-papers	en_ZA
dc.identifier.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.	en_ZA
dc.identifier.issn	0038-223X (print)
dc.identifier.issn	2225-6253 (online)
dc.identifier.other	10.17159/2411-9717/2017/v117n10a4
dc.identifier.uri	http://hdl.handle.net/2263/65878
dc.language.iso	en	en_ZA
dc.publisher	Southern African Institute of Mining and Metallurgy	en_ZA
dc.rights	© The Southern African Institute of Mining and Metallurgy, 2017	en_ZA
dc.subject	Zr-2.5Nb	en_ZA
dc.subject	Autogenous welding	en_ZA
dc.subject	Microstructure	en_ZA
dc.subject	Laser beam welding (LBW)	en_ZA
dc.subject	Gas tungsten arc welding (GTAW)	en_ZA
dc.subject	Mechanical properties	en_ZA
dc.subject	β-α phase transformation temperature	en_ZA
dc.subject	Cooling rate	en_ZA
dc.title	Microstructural characterisation of laser beam and gas tungsten arc welded zirconium-2.5Nb	en_ZA
dc.type	Article	en_ZA