Structure, Texture and Magnetic Properties of Laser-Welded Ultrathin Fe-Co-V Foils

doi:10.1007/s40195-014-0202-8

Abstract

Abstract:

This research aims to investigate the effect of pulsed Nd:YAG laser micro-welding on the microstructure, texture and magnetic properties of ultra-thin Fe-Co-7.15 wt% V magnetic alloy. Optical microscopy, scanning electron microscopy and electron backscattered diffraction techniques were used to study the microstructural evolutions. Also, vibrating sample magnetometry was used to characterize the magnetic properties. The results showed that the fractions of low Σ coincidence site lattice boundaries in the fusion zone are higher than those of the base metal. The welded samples experience a significant decrease in their magnetic properties. It was found that the formation of new fiber texture in the fusion zone and grain coarsening are the most important factors affecting the magnetic properties.

Key words: Magnetic properties, Ultra-thin magnetic foils, Texture analysis, EBSD study, Nd:YAG laser micro-welding

Hossein Mostaan, Morteza Shamanian, Seyed Mahmoud Monirvaghefi, Peiman Behjati, Jerzy A. Szpunar, Morteza Amiri, Mashallah Fathi Moghadam. Structure, Texture and Magnetic Properties of Laser-Welded Ultrathin Fe-Co-V Foils[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(3): 338-347.

Figures/Tables 13

Table 1 Test conditions used in this study for samples A and B

Sample	Power (W)	Pulse duration (ms)	Travel speed (mm/min)	Focus position (mm)
A	54	2.625	87.5	-1.625
B	68	2.625	87.5	-0.875

Fig. 1 SE-SEM micrograph of the as-received Fe-Co-7.15 wt% V alloy

Fig. 2 OM micrographs of weld bead geometry for sample A a, sample B b, macromorphologies of the surfaces of sample A c, sample B d, SEM micrographs of the near the HAZ of sample A e, sample B f, FZ center for sample A g, sample B h

Fig. 3 Microstructural features of the base metal: a EBSD map; b misorientation distribution

Table 2 Fraction (%) of the special CSL boundaries after laser welding

Position	Σ1	Σ3	Σ9	Σ27	Σ(1-29)
Base metal	77	1.16	0.45	0.14	80.94
Interface of HAZ and FZ	76	2.3	0.73	0.17	84.27
Center of FZ	63	7	0.023	0	77.25
Near the HAZ (inside the FZ)	75	5.84	0	0	86.64

Fig. 4 Microstructural features of the interface of HAZ and FZ

Fig. 5 Microstructural features of the center of FZ in sample B: a EBSD map; b misorientation distribution

Fig. 6 Microstructural features of near the HAZ in sample A: a EBSD map; b misorientation distribution

Fig. 7 Textures of specimens revealed by \( \varphi_{2} = 0^{\text{o}} {\text{ and }}45^{\text{o}} \), ODF sections of the ideal orientation positions for the main texture components a, BM b, FZ of sample A c, FZ of sample B d

Fig. 8 Intensity distributions along α-fiber a, γ-fiber b

Fig. 9 Inverse Pole Figures for a BM, b FZ of sample A, c FZ of sample B

Table 3 Magnetic properties of the as-received and welded samples

Sample	B _s (T)	(BH)_max (kJ/m³)	B _r (T)	H _c (Oe)
As-received	2.09	54.4	1.043	150
A	2.29	3.33	0.187	74.1
B	2.26	2.01	0.152	61.57

Fig. 10 XRD patterns for the as-received sample and FZ of welded samples

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