超声冲击对高速列车转向架焊接十字接头超高周疲劳性能的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.020.017

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Abstract To address the fatigue problem occurring to the bogie of high-speed train in the practical application, the weld toes were treated by HJ-Ⅲ type ultrasonic impact treatment device at room temperature, in order to investigate the effect of ultrasonic impact treatment (UIT) on very high cycle fatigue (VHCF) behavior of welded SAM490BW cross joint of high-speed train bogie. The results indicated that the S-N curves of as-welded and UIT specimens exhibit a plateau beyond 10⁷cycles. Compared with the as-welded joints, the degree of improvement of VHCF performance of SAM490BW steel cross welded joint treated was up to 25%. There were several crack initiation locations on the fracture surface for as-welded samples, whereas, there was only one crack source for UIT specimens. The concentration coefficient of the welded joints toes decreased by 32.4% after UIT, the crack initiation probability was reduced. Residual tensile stress could be significantly reduced by UIT and residual compressive stress was induced on surface of welded joints toe, up to -255.5 MPa. A surface layer of nanocrystalline microstructure could be produced, the average grain size was less than 100 nm. Crack propagation path, in plastic deformation region, could get longer by implementing the UIT.

Key words： bogie weld joint ultrasonic impact treatment very high cycle fatigue performance high-speed train

Published: 25 October 2017 Online: 2018-05-05

CLC number:	U270.331
	U270.41
	TG457.11

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	LU Zongmin
	HE Bolin
	YU Yingxia

Cite this article:

LU Zongmin,HE Bolin,YU Yingxia. Influence of Ultrasonic Impact on the Very High Cycle Fatigue Properties of Welded Cross Joint for High-speed Train Bogie[J]. Materials Reports, 2017, 31(20): 77-81.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.020.017 OR https://www.mater-rep.com/EN/Y2017/V31/I20/77

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