Combined effect and mechanism of thermal behaviour and flow characteristic on microstructure and mechanical property of oscillation laser-welded of IN718

IF 3.1 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science and Technology of Welding and Joining Pub Date : 2022-11-02 DOI:10.1080/13621718.2022.2140934

S. Yan, Zheng Meng, Bo Chen, C. Tan, Xiaoguo Song, Guodong Wang

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引用次数: 2

Abstract

An oscillation laser beam was conducted to enhance the mechanical property of Inconel 718 joints. The dynamic behaviours of molten pool on the microstructure and mechanical property of joints were investigated. The results showed that the improvement of Laves phase and the tensile property depended on the flow and thermal behaviours of molten pool. Compared with conventional laser welding, the maximum flow velocity on the surface of molten pool increased by 375.5%(150 Hz), which indicated the dendrites received greater bending stress to break more easily, resulting in the homogenisation of element. In addition, the oscillation laser beam decreased the temperature gradient from 218.5°C/mm to 73°C/mm, and the cooling rate of 150 Hz in the centre and edge of molten pool increased by 64.4% and 111.9%, which hindered the segregation phenomenon during the element diffusion to restrain the formation of Laves phase in the eutectic reaction.

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热行为和流动特性对IN718振荡激光焊接组织和力学性能的综合影响及机理

采用振荡激光束提高了Inconel 718接头的力学性能。研究了熔池的动态行为对接头组织和力学性能的影响。结果表明，熔池的流动和热行为决定了Laves相和拉伸性能的改善。与常规激光焊接相比，熔池表面的最大流速提高了375.5%(150 Hz)，表明枝晶受到更大的弯曲应力，更容易断裂，导致元件均质化。振荡激光束使温度梯度从218.5°C/mm降低到73°C/mm，熔池中心和边缘150 Hz的冷却速率分别提高了64.4%和111.9%，抑制了元素扩散过程中的偏析现象，抑制了共晶反应中Laves相的形成。

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来源期刊

Science and Technology of Welding and Joining 工程技术-材料科学：综合

CiteScore

6.10

自引率

12.10%

发文量

审稿时长

1.7 months

期刊介绍： Science and Technology of Welding and Joining is an international peer-reviewed journal covering both the basic science and applied technology of welding and joining. Its comprehensive scope encompasses all welding and joining techniques (brazing, soldering, mechanical joining, etc.) and aspects such as characterisation of heat sources, mathematical modelling of transport phenomena, weld pool solidification, phase transformations in weldments, microstructure-property relationships, welding processes, weld sensing, control and automation, neural network applications, and joining of advanced materials, including plastics and composites.