The residual stress distribution and fatigue property of TC4 laser-welded joint treated by laser shock peening
- DOI
- 10.2991/icimm-15.2015.119How to use a DOI?
- Keywords
- Laser Shock Peening; Laser Welding; Compressive Residual Stress; Fatigue Life.
- Abstract
The absence of highly tensile residual stress which distributed in laser welded joint is primary factor of decreasing fatigue life. Laser Shock Peening (LSP) experiments were conducted on TC4 laser welded joints of 2.5mm thickness, using circular laser spot with pulse duration of 10ns, laser power density of 7.2GW/cm2 and overlapping ratio of 37.5%. Surface residual stress distribution were studied under LSP of one layer, three layers and five layers. Surface tensile residual stresses converted to compressive residual stresses on LSP area, and compressive residual stresses along longitudinal direction were greater than along transverse direction. The amplitude of compressive residual stress were greatly relative to number of LSP layer. Fatigue life of specimens treated by three layers increased 50% in comparison to untreated specimens (maximum stress:750MPa, stress ratio:0.06). In a word, LSP could adjust residual stress field of laser welded joint, and it is an alternative technology to be potential to substantially improve fatigue performance.
- Copyright
- © 2015, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Ziwen Cao AU - Zhigang Che AU - Shikun Zou PY - 2015/07 DA - 2015/07 TI - The residual stress distribution and fatigue property of TC4 laser-welded joint treated by laser shock peening BT - Proceedings of the 5th International Conference on Information Engineering for Mechanics and Materials PB - Atlantis Press SP - 631 EP - 635 SN - 2352-5401 UR - https://doi.org/10.2991/icimm-15.2015.119 DO - 10.2991/icimm-15.2015.119 ID - Cao2015/07 ER -