Microstructure and Internal Friction Behavior of Laser 3D Printed Fe-Based Amorphous Composites

doi:10.1007/s40195-023-01619-3

Abstract

Abstract:

Laser 3D printing, also known as laser additive manufacturing (LAM), is favored for its ability to form bulk metallic glass (BMG) and its composite materials (BMGcs) with freeform geometries. In this work, two different kinds of Fe₄₁Co₇Cr₁₅Mo₁₄C₁₅B₆Y₂ amorphous coatings (A and B) were prepared by using LAM technology under air- and water-cooled conditions, respectively; meanwhile, to reduce the cracks generated due to the residual thermal stresses, coating C obtained by air-sweep annealing of B with a low energy-density laser. The morphology and amorphous content and microstructure of the coatings were investigated, the results show many cracks in coating B deposited under water-cooled conditions, and its microstructure shows an amorphous-crystal-nanocrystalline mixed structure. Cracking was suppressed in coating C, obtained by air-sweep annealing based on coating B, but the amorphous content was reduced from 32.6 to 13.4%. And the hardness and corrosion resistance of the coating will increase with the increase in the amorphous content. Finally, the internal friction behavior of a BMGcs was prepared on the basis of the process of sample C is compared with that of as-cast amorphous alloys. The results show that the low temperature internal friction behavior of BMGcs is affected by the defects produced during printing, and the high temperature internal friction behavior is affected by the precipitated hard phase.

Key words: Laser 3D printing, Amorphous coating, Microstructure, Corrosion resistance, Internal friction behavior

Shuilong Huang, Qingjun Chen, Li Ji, Kan Wang, Guosheng Huang. Microstructure and Internal Friction Behavior of Laser 3D Printed Fe-Based Amorphous Composites[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(1): 196-204.

Figures/Tables 7

Fig. 1 a XRD pattern of Fe-based amorphous powder, b corresponding SEM image

Table 1 Three processes for coating preparation

Sample	Power, P (W)	Rate, v (mm/s)	Preheating power, P (W)	Preheating rate, v (mm/s)	Annealing power, P (W)	Annealing rate, v (mm/s)	Cooling method
A	1300	900	-	-	-	-	Air
B	1300	900	-	-	-	-	Water
C	1300	900	800	300	800	600	Water

Fig. 2 Macroscopic photograph of the samples and its crack morphology in longitudinal section: a, b Sample A, c, d Sample B, e, f Sample C, respectively; g XRD patterns of the Samples; h DSC patterns of the Fe-base amorphous powder and Samples

Fig. 3 SEM images of microstructure of the samples: a Sample A, b Sample B, c Sample C;d enlarged image of the green boxed area in b and e enlarged image of the blue boxed area in c; f Vickers hardness plots of different microstructures for Samples A-C (where the horizontal coordinates correspond to the areas marked by the numbers in a-c); g schematic representation of the number of cycles of heat applied to different areas of the coating during laser cladding

Fig. 4 a TEM bright field image of sample C and diffraction patterns of crystalline phases (Fe2C, (Fe, Cr)23C6, Co2MO3 corresponding to SA1, SA2, SA3); b (HR)-TEM image and corresponding SAED of the black boxed area in a

Fig. 5 a Modulus-temperature and internal friction-temperature curves of crack-free BMGcs at five different frequencies, b its corresponding DSC pattern

Fig. 6 Dynamic point polarization curves of as-cast Fe-based amorphous alloy and coating A, C in 3.5% NaCl solution

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