Surface grain refinement mechanism of SMA490BW steel cross joints by ultrasonic impact treatment

Bo-lin He; Lei Xiong; Ming-ming Jiang; Ying-xia Yu; Li Li

doi:10.1007/s12613-017-1421-6

Volume 24 Issue 4

Apr. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(4): 410-414

Bo-lin He, Lei Xiong, Ming-ming Jiang, Ying-xia Yu, and Li Li, Surface grain refinement mechanism of SMA490BW steel cross joints by ultrasonic impact treatment, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 410-414. https://doi.org/10.1007/s12613-017-1421-6

Cite this article as:

Bo-lin He, Lei Xiong, Ming-ming Jiang, Ying-xia Yu, and Li Li, Surface grain refinement mechanism of SMA490BW steel cross joints by ultrasonic impact treatment, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 410-414. https://doi.org/10.1007/s12613-017-1421-6

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Research Article

Surface grain refinement mechanism of SMA490BW steel cross joints by ultrasonic impact treatment

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Corresponding author:
Bo-lin He E-mail: hebolin@163.com
Received: 8 October 2016; Revised: 28 November 2016; Accepted: 29 November 2016

Abstract

Abstract

Ultrasonic impact treatment (UIT) is a postweld technique for improving the fatigue strength of welded joints. This technique makes use of ultrasonic vibration to impact and plastically deform a weld toe and can achieve surface grain refinement of the weld toe, which is considered as the main reason for the improvement of fatigue strength. In this paper, the microstructure of the surface of a treated weld toe was observed by metallographic microscopy and transmission electron microscopy (TEM). The results show that UIT could produce severe plastic deformation on the surface layer of the weld toe and the maximum depth of plastic deformation extended to approximately 260 μm beneath the treated surface. Repeated processing could exacerbate the plastic deformation on the surface layer, resulting in finer grains. We can conclude that the surface grain refinement mechanism of SMA490BW welded joints is related to the high density of dislocation tangles and dislocation walls.
- weathering steel;
- welding ultrasonic impact treatment;
- plastic deformation;
- joints;
- grain refinement

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