NDLI: Fiber Laser Welded AZ31 Magnesium Alloy: The Effect of Welding Speed on Microstructure and Mechanical Properties

Content Provider	Springer Nature Link
Author	Chowdhury, S. H. Chen, D. L. Bhole, S. D. Powidajko, E. Weckman, D. C. Zhou, Y.
Copyright Year	2011
Abstract	This study was aimed at characterizing microstructural change and evaluating tensile and fatigue properties of fiber laser welded AZ31B-H24 Mg alloy with special attention to the effect of welding speed. Laser welding led to the formation of equiaxed dendrites in the fusion zone and columnar dendrites near the fusion zone boundary along with divorced eutectic Mg$_{17}$Al$_{12}$ particles and recrystallized grains in the heat-affected zone. The lowest hardness across the weld appeared in the fusion zone. Although the yield strength, ductility, and fatigue life decreased, the hardening capacity increased after laser welding, with a joint efficiency reaching about 90 pct. A higher welding speed resulted in a narrower fusion zone, smaller grain size, higher yield strength, and longer fatigue life, as well as a slightly lower strain-hardening capacity mainly because of the smaller grain sizes. Tensile fracture occurred in the fusion zone, whereas fatigue failure appeared essentially in between the heat-affected zone and the fusion zone. Fatigue cracks initiated from the near-surface welding defects and propagated by the formation of fatigue striations together with secondary cracks.
Starting Page	2133
Ending Page	2147
Page Count	15
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	43
Issue Number	6
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2012-01-05
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nanotechnology Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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