Microstructure and properties of additive manufactured Cu-Al bronze alloy on St-St substrate using CMT arc as heat source

被引：0
作者：
Chen M.-A. [1 ]
Zhang J.-H. [1 ]
Yu X.-B. [1 ]
机构：
[1] Key Laboratory for Liquid-Solid Structure Evolution and Materials Processing, Ministry of Education, Institute for Materials Joining, Shandong University, Jinan
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2021年 / 31卷 / 12期
关键词：
Additive manufacturing; Cold metal transfer; Mechanical property; Microstructure;
D O I：
10.11817/j.ysxb.1004.0609.2021-37720
中图分类号：
学科分类号：
摘要：
The effect of process parameters on microstructure and properties of additive manufactured Cu-Al bronze on St-St substrate was studied. The results show that a continuous layer of Fe-based solid solution forms between the substrate and the deposit. In addition, isolated particles composed of Fe-based solid solution and FeAl3 are distributed in the additive manufactured Cu-Al Cu matrix. The thickness of the Fe-based solid solution layer and the particle size and number increase with increasing wire feed speed. The shear strength between the substrate and deposit increases with the increase of wire feed speed. The shear fracture does not propagate along the Fe-based solid solution layer, but goes through the deposited metal near the substrata. The microstructure of each deposited pass above the second layer are divided into three zones, i.e. coarse columnar grain zone, fine columnar grain zone and mixed zone consisting of equiaxed and horizontal columnar grains. The wire feeding speed has little effect on the mechanical strength of thin-walled specimen. The transverse tensile strength is about 390 MPa and the longitudinal one is about 360 MPa. All the fracture surfaces exhibit dimple structure. © 2021, China Science Publishing & Media Ltd. All right reserved.
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页码：3499 / 3507
页数：8
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