Influence of laser shock peening on microstructure and surface hardness of TC17 titanium alloy

HOU Guo; ZHU Ying; GUO Wei; FAN Bowen; HUANG Shuai

doi:10.7510/jgjs.issn.1001-3806.2017.01.015

LASER TECHNOLOGY > 2017 > 41(1): 68-73. > DOI: 10.7510/jgjs.issn.1001-3806.2017.01.015

HOU Guo, ZHU Ying, GUO Wei, FAN Bowen, HUANG Shuai. Influence of laser shock peening on microstructure and surface hardness of TC17 titanium alloy[J]. LASER TECHNOLOGY, 2017, 41(1): 68-73. DOI: 10.7510/jgjs.issn.1001-3806.2017.01.015

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Influence of laser shock peening on microstructure and surface hardness of TC17 titanium alloy

1.
School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
2.
School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China

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Received Date: December 22, 2015
Revised Date: March 15, 2016
Published Date: January 24, 2017

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Abstract

Abstract

To study the influence of laser shock peening number and pulse energy on microstructure and surface hardness of TC17 titanium alloy, TC17 titanium alloy samples were laser shock peened with different process parameters. The results show that severe plastic deformation and a great deal of high-density dislocations, such as proliferate, pile up and tangle, are generated in the material surface layer in the process. The maximum depth of micro-pits created by single pulse can be 21.4μm. When pulse energy is 5J, and overlap impacts increase from 1 time to 4 times, the surface hardness of materials increases by 8.3%, 17.2%, 24.3% and 24.5% respectively, compared with parent metal. In the meantime, when overlap impact is 1 time, and pulse energy is 5J and 7J, the surface hardness increases by 8.3% and 14.2% respectively. The conclusion is that the surface hardness is enhanced with the increase of impacts and pulse energy. High density dislocation on material surface by laser shock processing is the key reason for the increase of surface hardness.
- laser technique,
- laser shock peening,
- TC17 titanium alloy,
- microstructure,
- surface hardness

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References (19)

References

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