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Materials 2016, 9(6), 471; doi:10.3390/ma9060471

The Effect of Ultrasonic Peening Treatment on Fatigue Performance of Welded Joints

1
Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun 130025, China
2
School of Mechanical Science and Engineering, Jilin University, Changchun 130025, China
*
Author to whom correspondence should be addressed.
Academic Editor: Yoshiharu Mutoh
Received: 11 May 2016 / Revised: 1 June 2016 / Accepted: 2 June 2016 / Published: 14 June 2016
(This article belongs to the Special Issue Fracture and Fatigue Mechanics of Materials)
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Abstract

Ultrasonic peening treatment (UPT) as a method of severe plastic deformation was used to treat cruciform welded joints of Q345 steel. The application of UPT achieves material surface nanocrystallization of the peening zone, reduces stress concentration, and produces residual compressive stresses at the welded toe. Micro-structure, hardness, stress relief, S-N curve, and the fatigue fracture mechanism of cruciform welded joint of Q345 steel, both before and after UPT, were analyzed in detail. The main results show that: stress concentration and residual tensile stress are the main reasons to reduce fatigue strength of cruciform welded joints. The fatigue life of cruciform welded joints is improved for surface hardening, compressive stress, and grain refinement by UPT. Residual compressive stress caused by UPT is released with the increase of fatigue life. A very significant fatigue strength improvement happens when UPT is replenished repeatedly after a certain number of cycles. View Full-Text
Keywords: ultrasonic peening treatment; stress relief; welded joint; fatigue; stress concentration ultrasonic peening treatment; stress relief; welded joint; fatigue; stress concentration
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhao, X.; Wang, M.; Zhang, Z.; Liu, Y. The Effect of Ultrasonic Peening Treatment on Fatigue Performance of Welded Joints. Materials 2016, 9, 471.

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