Next Article in Journal
Effect of Pre-Fatigue on the Monotonic Deformation Behavior of a Coplanar Double-Slip-Oriented Cu Single Crystal
Next Article in Special Issue
Nanocrystallization in the Duplex Ti-6Al-4V Alloy Processed by Multiple Laser Shock Peening
Previous Article in Journal
The Effect of Ultrafast Heating in Cold-Rolled Low Carbon Steel: Recrystallization and Texture Evolution
Previous Article in Special Issue
Water Droplet Erosion Performance of Laser Shock Peened Ti-6Al-4V
Article Menu

Export Article

Open AccessArticle
Metals 2016, 6(11), 292; doi:10.3390/met6110292

Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening

1
School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
2
School of Mechanical and Electrical Engineering, Xuzhou Institute of Technology, Xuzhou 221111, China
*
Author to whom correspondence should be addressed.
Academic Editor: Patrice Peyre
Received: 12 September 2016 / Revised: 11 November 2016 / Accepted: 17 November 2016 / Published: 22 November 2016
(This article belongs to the Special Issue Laser Shock Processing on Metal)
View Full-Text   |   Download PDF [3600 KB, uploaded 22 November 2016]   |  

Abstract

The aim of this paper is to study the effects of laser peening (LP) on the residual stress distribution and microstructure evolution of AA 6061-T6 under different temperatures. A laser peening experiment was conducted on the square-shape samples by using single spot and 50% overlap shock. Three-dimensional surface morphologies of treated samples were observed. The influence of peening temperature on the distribution of compressive residual stress was analyzed. An optical microscope (OM) and a transmission electron microscope (TEM) were employed to observe the microstructure evolution of the samples before and after LP. The results indicate that, as the peening temperature increases, the micro-hardness increases first and then decreases. The LP process induces high-amplitude compressive residual stress on the surface at different temperatures even if the compressive residual stress slightly reduces with increases in temperature. The maximum compressive residual stress affected layer depth is about 0.67 mm, appearing at a temperature of 160 °C. The OM test revealed that the grain size was significantly decreased after warm laser peening (WLP) and that the average value of grain size was reduced by 50%. The TEM test shows that more dislocation tangles were produced in AA 6061-T6 after WLP; compared to the LP process, the precipitate-dislocation interaction can benefit both strength and ductility for AA 6061-T6, thus enhancing the mechanical properties of the material. View Full-Text
Keywords: AA 6061-T6; laser peening; temperature; surface integrity; microstructure AA 6061-T6; laser peening; temperature; surface integrity; microstructure
Figures

Figure 1

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).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Huang, S.; Wang, Z.; Sheng, J.; Agyenim-Boateng, E.; Liu, M.; Yang, X.; Zhou, J. Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening. Metals 2016, 6, 292.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top