Effect of heat input on the microstructure and mechanical properties of tungsten inert gas arc butt-welded AZ61 magnesium alloy plates

Journal Article · Tue Dec 15 04:00:00 EST 2009 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2009.09.010· OSTI ID:22066162

Dong, Min ^[1]; Shiqiang, Lai; Jie, Chen ^[1]

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1. College of Material Science and Engineering, Chongqing University, Chongqing 400044 (China)

In this paper, the effects of heat input on the microstructures and mechanical properties of tungsten inert gas arc butt-welded AZ61 magnesium alloy plates were investigated by microstructural observations, microhardness tests and tensile tests. The results show that with an increase of the heat input, the grains both in the fusion zone and the heat-affected zone coarsen and the width of the heat-affected zone increased. Moreover, an increase of the heat input resulted in a decrease of the continuous {beta}-Mg{sub 17}Al{sub 12} phase and an increase of the granular {beta}-Mg{sub 17}Al{sub 12} phase in both the fusion zone and the heat-affected zone. The ultimate tensile strength of the welded joint increased with an increase of the heat input, while, too high a heat input resulted in a decrease of the ultimate tensile strength of the welded joint. In addition, the average microhardness of the heat-affected zone and fusion zone decreased sharply with an increase of the heat input and then decreased slowly at a relatively high heat input.

• OSTI ID: 22066162
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 12 Vol. 60; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ARC WELDING
HEAT
HEAT AFFECTED ZONE
MAGNESIUM BASE ALLOYS
MATERIALS TESTING
MICROHARDNESS
MICROSTRUCTURE
PLATES
TENSILE PROPERTIES
TUNGSTEN
WELDED JOINTS