Microstructure and properties of magnetic field assisted hot dip aluminized coatings on TA15 titanium alloy surface

doi:10.13251/j.issn.0254-6051.2023.08.041

Abstract

Abstract: Microstructure and properties of hot dip aluminized coatings on the surface of TA15 titanium alloy under the action of alternating electromagnetic field were studied, and the thermal diffusion treatment was carried out at 800 ℃. The morphology, microstructure and element distribution of the coatings were analyzed by means of energy dispersive spectroscopy, scanning electron microscope and X-ray diffractometer. The microhardness of the coatings was tested by microhardness tester. The results show that after applying alternating electromagnetic field with current intensity of 15 A and 20 A during the process of hot dip aluminizing and thermal diffusion, the coatings bind well with the alloy substrate, no obvious crack is found, the formation of pores and cavities is significantly reduced, the dipping time is shortened, and thus the production cycle is accelerated. When the current intensity is 15 A and 20 A, the maximum hardness of the bonding zones can reach 518.7 HV0.2. When the current intensity increases to 25 A, the electromagnetic stirring effect sharply increases, and no high-quality coating can be obtained.

Key words: hot dip aluminizing, electromagnetic field, current intensity, thermal diffusion, microstructure and properties

CLC Number:

TG178

Li Yong, Wang Qiulin, Men Zhengxing, Zhao Yulin, Zhang Hong. Microstructure and properties of magnetic field assisted hot dip aluminized coatings on TA15 titanium alloy surface[J]. Heat Treatment of Metals, 2023, 48(8): 254-259.

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