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Effect of Pulse Laser Welding Parameters and Filler Metal on Microstructure and Mechanical Properties of Al-4.7Mg-0.32Mn-0.21Sc-0.1Zr Alloy
metals • 2017
Publication Information
Authors
I. Loginova, A. Khalil, A. Pozdniakov, A. Solonin, V. Zolotorevskiy
Keywords
: aluminum alloys; electron microscopy; stress/strain measurements; laser methods; grains
and interfaces
Journal
metals
Publisher
Not Available
Volume
7
Issue
12
Pages
Not Available
publication.type
International
Paper Link
Open Link
Supplementary Materials
Not Available
Abstract
The effect of pulse laser welding parameters and filler metal on microstructure and
mechanical properties of the new heat-treatable, wieldable, cryogenic Al-4.7Mg-0.32Mn-0.21Sc-0.1Zr
alloy were investigated. The optimum parameters of pulsed laser welding were found. They were
330–340 V in voltage, 0.2–0.25 mm in pulse overlap with 12 ms duration, and 2 mm/s speed and
ramp-down pulse shape. Pulsed laser welding without and with Al-5Mg filler metal led to the
formation of duplex (columnar and fine grains) as-cast structures with hot cracks and gas porosity
as defects in the weld zone. Using Al-5Ti-1B filler metal for welding led to the formation of the fine
grain structure with an average grain size of 4 ± 0.2 µm and without any weld defects. The average
concentration of Mg is 2.8%; Mn, 0.2%; Zr, 0.1%; Sc, 0.15%; and Ti, 2.1% were formed in the weld.
The ultimate tensile strength (UTS) of the welded alloy with AlTiB was 260 MPa, which was equal to
the base metal in the as-cast condition. The UTS was increased by 60 MPa after annealing at 370 ◦C
for 6 h that was 85% of UTS of the base alloy
mechanical properties of the new heat-treatable, wieldable, cryogenic Al-4.7Mg-0.32Mn-0.21Sc-0.1Zr
alloy were investigated. The optimum parameters of pulsed laser welding were found. They were
330–340 V in voltage, 0.2–0.25 mm in pulse overlap with 12 ms duration, and 2 mm/s speed and
ramp-down pulse shape. Pulsed laser welding without and with Al-5Mg filler metal led to the
formation of duplex (columnar and fine grains) as-cast structures with hot cracks and gas porosity
as defects in the weld zone. Using Al-5Ti-1B filler metal for welding led to the formation of the fine
grain structure with an average grain size of 4 ± 0.2 µm and without any weld defects. The average
concentration of Mg is 2.8%; Mn, 0.2%; Zr, 0.1%; Sc, 0.15%; and Ti, 2.1% were formed in the weld.
The ultimate tensile strength (UTS) of the welded alloy with AlTiB was 260 MPa, which was equal to
the base metal in the as-cast condition. The UTS was increased by 60 MPa after annealing at 370 ◦C
for 6 h that was 85% of UTS of the base alloy