Generation of Residual Stresses and Improvement of Surface Integrity Characteristics by Laser Shock Processing

Author:

Trdan Uros1,Grum Janez1,Hill Michael R.2

Affiliation:

1. University of Ljubljana

2. University of California

Abstract

The influence of different parameters of laser shock processing applied to a precipitation-hardened aluminium alloy 6082-T651, on residual stress, surface tophraphy and microhardness was investigated. Processing was performed with an innovative Nd:YLF laser with the power densities of 2 and 4 GW/cm2, with a uniform pulse duration of 18 ns. Laser shock processing experiments were performed with the closed ablation method to ensure a higher shock-wave pressure. In the first phase, the study was focused on an evaluation of surface topography, with the record of the surface roughness profile and with the surface evaluation at a scanning electron microscope JEOL JXA-8600M. Then followed measurement of microhardness HV0.2in the cross section region. In the second phase comparison of residual stresses which were measured using the X-ray diffraction, was performed. Laser shock processing turned out to be a very efficient technique to improve surface properties. On the basis of the micro plastic deformation induced by shock waves, an increased dislocation density in the specimen surface was obtained. The gradient of dislocation piling through the specimen depth improved the variation of microhardness and residual stresses, which, in turn, improves fatigue strength of the material under dynamic loading.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference8 articles.

1. K. Ding, L. Ye: Laser shock peening - Performance and process simulation, (Woodhead Publishing Limited Cambridge, England, 2006).

2. M.R. Hill, T. E. Pistochini, A.T. DeWald: Proceedings of the 9th International Conference on Shot Peening, Eds.:V. Shulze, A. Niku-Lari, 2005, pp.156-162.

3. C. Rubio-González, et. al.: Mat. Sci. Eng. A386, 2006, pp.291-295.

4. Trdan, U., Grum, J., Porro, J.A., Ocana, J.L., 2009. In: 17th International Symposium on Gas Flow and Chemical Lasers, SPIE, Vol. 7131.

5. Z. Hong, Y. Chengye: Mat. Sci. Eng A257, 1998, pp.322-327.

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3