TY - JOUR
T1 - Wire arc additive manufacturing of AZ31 magnesium alloy
T2 - Grain refinement by adjusting pulse frequency
AU - Guo, Jing
AU - Zhou, Yong
AU - Liu, Changmeng
AU - Wu, Qianru
AU - Chen, Xianping
AU - Lu, Jiping
N1 - Publisher Copyright:
© 2016 by the authors.
PY - 2016/10/9
Y1 - 2016/10/9
N2 - Wire arc additive manufacturing (WAAM) offers a potential approach to fabricate large-scale magnesium alloy components with low cost and high efficiency, although this topic is yet to be reported in literature. In this study, WAAM is preliminarily applied to fabricate AZ31 magnesium. Fully dense AZ31 magnesium alloy components are successfully obtained. Meanwhile, to refine grains and obtain good mechanical properties, the effects of pulse frequency (1, 2, 5, 10, 100, and 500 Hz) on the macrostructure, microstructure and tensile properties are investigated. The results indicate that pulse frequency can result in the change of weld pool oscillations and cooling rate. This further leads to the change of the grain size, grain shape, as well as the tensile properties. Meanwhile, due to the resonance of the weld pool at 5 Hz and 10 Hz, the samples have poor geometry accuracy but contain finer equiaxed grains (21 μm) and exhibit higher ultimate tensile strength (260 MPa) and yield strength (102 MPa), which are similar to those of the forged AZ31 alloy. Moreover, the elongation of all samples is above 23%.
AB - Wire arc additive manufacturing (WAAM) offers a potential approach to fabricate large-scale magnesium alloy components with low cost and high efficiency, although this topic is yet to be reported in literature. In this study, WAAM is preliminarily applied to fabricate AZ31 magnesium. Fully dense AZ31 magnesium alloy components are successfully obtained. Meanwhile, to refine grains and obtain good mechanical properties, the effects of pulse frequency (1, 2, 5, 10, 100, and 500 Hz) on the macrostructure, microstructure and tensile properties are investigated. The results indicate that pulse frequency can result in the change of weld pool oscillations and cooling rate. This further leads to the change of the grain size, grain shape, as well as the tensile properties. Meanwhile, due to the resonance of the weld pool at 5 Hz and 10 Hz, the samples have poor geometry accuracy but contain finer equiaxed grains (21 μm) and exhibit higher ultimate tensile strength (260 MPa) and yield strength (102 MPa), which are similar to those of the forged AZ31 alloy. Moreover, the elongation of all samples is above 23%.
KW - AZ31 magnesium alloy
KW - Grain
KW - Mechanical properties
KW - Wire arc additive manufacturing
UR - http://www.scopus.com/inward/record.url?scp=84995505134&partnerID=8YFLogxK
U2 - 10.3390/ma9100823
DO - 10.3390/ma9100823
M3 - Article
AN - SCOPUS:84995505134
SN - 1996-1944
VL - 9
JO - Materials
JF - Materials
IS - 10
M1 - 823
ER -