焊接参数对光纤激光振荡焊接异种 TWIP/304L 钢接头机械性能和微观结构特征的影响

IF 1.6 4区 材料科学 Q2 Materials Science
Fatih Özen
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引用次数: 0

摘要

采用振荡光纤激光焊接技术,以 80 毫米/秒和 120 毫米/秒的焊接速度以及不同的功率水平制作了 TWIP/304L 异种接头。拉伸试验、硬度测量和 SEM/EDS/EBSD 分析揭示了 TWIP/304L 异种钢接头的特性。激光束的摆动导致熔合区出现分层痕迹。这些分层痕迹包含初级奥氏体枝晶和惰性次生奥氏体。两种钢的热影响区都很窄。由于 304L 的熔合区和热影响区的液相点不同,在熔合区和热影响区之间形成了一层未混合区。在 TWIP 钢的热影响区观察到一些晶间间隙。在激光功率为 3600 W、焊接速度为 80 mm/s 时,拉伸强度达到最大值 561.3 MPa。由于高硬度差和填充不足引起的缺口效应,所有试样都从异种接头的熔合区失效。由于熔合区的成分不均匀,硬度差达到 51.4 Hv10。微观结构的这种变化导致了韧性断裂和脆性断裂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of Welding Parameters on Mechanical Performance and Microstructural Characterization of Fiber Laser Oscillation Welded Dissimilar TWIP/304L Steel Joints

Effect of Welding Parameters on Mechanical Performance and Microstructural Characterization of Fiber Laser Oscillation Welded Dissimilar TWIP/304L Steel Joints

A dissimilar TWIP/304L joint was produced using oscillation fiber laser welding with welding speeds of 80 mm/s and 120 mm/s, as well as different power levels. Tensile tests, hardness measurements, and SEM/EDS/EBSD analyses were conducted to reveal the characterization of dissimilar TWIP/304L steel joint. Oscillation of the laser beam resulted in layered marks in the fusion zone. These layered marks contain primary austenitic dendrites and inertinitic secondary austenite. Both steels exhibited narrow heat-affected zones. An interlayer of an unmixed zone was formed between the fusion zone and the heat-affected zone of 304L due to differences in their liquidus points. Some intergranular gaps were observed in the heat-affected zone of the TWIP steel. The maximum tensile strength, 561.3 MPa, was achieved at a laser power of 3600 W and a welding speed of 80 mm/s. All specimens failed from the fusion zone of the dissimilar joint due to high hardness difference and underfill induced notch effect. The hardness difference reached 51.4 Hv10 due to the heterogeneous composition of the fusion zone. This variation in the microstructure resulted in both ductile and brittle fractures.

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来源期刊
Transactions of The Indian Institute of Metals
Transactions of The Indian Institute of Metals Materials Science-Metals and Alloys
CiteScore
2.60
自引率
6.20%
发文量
3
期刊介绍: Transactions of the Indian Institute of Metals publishes original research articles and reviews on ferrous and non-ferrous process metallurgy, structural and functional materials development, physical, chemical and mechanical metallurgy, welding science and technology, metal forming, particulate technologies, surface engineering, characterization of materials, thermodynamics and kinetics, materials modelling and other allied branches of Metallurgy and Materials Engineering. Transactions of the Indian Institute of Metals also serves as a forum for rapid publication of recent advances in all the branches of Metallurgy and Materials Engineering. The technical content of the journal is scrutinized by the Editorial Board composed of experts from various disciplines of Metallurgy and Materials Engineering. Editorial Advisory Board provides valuable advice on technical matters related to the publication of Transactions.
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