Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 42A, Issue 7, Pages 1815-1826Publisher
SPRINGER
DOI: 10.1007/s11661-010-0568-9
Keywords
-
Ask authors/readers for more resources
The objective of this investigation was to study the mechanical properties of a magnesium alloy welded by a CO2 laser. Residual stresses were measured by X-ray diffraction. They were calculated by the classic sin(2) psi method in the isotropic zones by using the orientation distribution function (ODF) in the textured zones. The results demonstrated that laser welding results in the formation of several different zones with different microstructural and mechanical properties. Welding principally leads to a reduction in grain size and a new distribution of phases. The most remarkable observation was that of a superficial layer on the surface of the welded zone. This layer has a marked crystallographic texture, a reduction in the level of aluminum, and an elevated microhardness. These characteristics disappear at a depth of 200 mu m under the welded zone. These modifications can be explained by the nature of the solidification, which occurs under nonequilibrium conditions resulting in an equiaxial columnar transition. This transition is evident also within the profile of residual tensile stresses, which are at their maximum at the interface between the superficial layer and the rest of the welded zone. These results are explained by the anisotropic properties of the textured layer in relation to the plasticity.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available