Microstructural and mechanical characteristics of direct laser welding 7075 super hard aluminum alloy/ D6AC ultra-high strength alloy structural steel

被引：13

作者：

Bao, Yang ^{[1
]}

Zhou, Jianping ^{[1
]}

Zhang, Yan ^{[1
]}

Xu, Yan ^{[1
]}

Liu, Hongsheng ^{[1
]}

机构：

[1] Xinjiang Univ, Sch Mech Engn, Urumqi 830000, Peoples R China

来源：

MATERIALS LETTERS | 2021年 / 287卷

关键词：

Welding; Laser processing; Microstructures; Intermetallic alloys and compounds;

D O I：

10.1016/j.matlet.2021.129312

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

By direct laser welding, 7075 super-hard aluminum and D6AC super-high strength alloy structural steel were joined together. In order to determine joint microstructures, Energy dispersive spectroscopy (EDS), Scanning electron microscopy (SEM) were used. To find out the mechanical properties of the joints, tensile tests were performed. The results showed that when the laser beam offset was centered on the contact surface of 7075/D6AC, the welding speed was 650 mm/min, the laser power was 396 W, and the defocusing distance was +5 mm, the joints were best formed. In the joints, brittle intermetallic compounds FeAl3, Fe3Al, and Fe2Al5 were formed. The joint fractured in the fusion line on the aluminum side with a gross tensile strength of 94 MPa. (C) 2021 Published by Elsevier B.V.

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