Effect of Hot Extrusion of SiCp/2024Al Composites on Microstructure and Properties of Laser Welded Joint

被引：0
|
作者：
Han R. [1 ]
Li X. [1 ,2 ]
Peng Y. [1 ]
Yan D. [2 ]
Wang K. [1 ]
机构：
[1] School of Material Science and Engineering, Nanjing University of Science and Technology, Jiangsu, Nanjing
[2] Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships, CSSC Huangpu Wenchong Shipbuilding Company Limited, Guangdong, Guangzhou
来源：
Binggong Xuebao/Acta Armamentarii | 2024年 / 45卷 / 06期
关键词：
aluminum matrix composite; hot extrusion; laser welding; microstructure and mechanical properties; SiC;
D O I：
10.12382/bgxb.2023.0105
中图分类号：
学科分类号：
摘要：
Using SiC particle-reinforced aluminum matrix composites instead of aluminum alloys to manufacture the ship hulls or armored hulls is a potential way to solve the binary contradiction between maneuverability and protection. In the actual application, this material has different states due to different supply channels, which have greater impact on material welding. SiCp / 2024Al composite materials in different supply states are welded by laser beam, the weld formations of the material before and after hot extrusion are compared, and the influence of hot extrusion process on the weld formation and the phase and microstructure of welded joint is analyzed. The fracture behaviour of composite materials is analyzed and its fracture mechanism is determined through microhardness, tensile and other mechanical property tests. The results show that there are a large number of porosity defects in the laser-welded seam of SiCp / 2024Al composites sintered by hot pressing, and the highest tensile strength of the welded joint is 76 MPa, which only reaches 28% of the strength of the base metal, and the material strength drops seriously after welding. After the hot-extruded composite material is welded by laser beam, the weld seam is complete, there is no air hole defect, and there is no obvious low hardness area in the welded joint. The tensile strength of welded joint reaches 124 MPa, which is 60% higher than that of the welded joint before hot extrusion. Compared with the hot-pressed sintered material, the weldability of hot-extruded material is significantly enhanced, and the mechanical properties of welded joint are significantly improved. © 2024 China Ordnance Industry Corporation. All rights reserved.
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页码：2054 / 2064
页数：10
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