Spall of Ti17 alloy induced by laser shock peening with multiple shots

WU Junfeng; ZOU Shikun; ZHANG Yongkang; SUN Guifang; NI Zhonghua; CAO Ziwen; CHE Zhigang

doi:10.11883/bzycj-2017-0082

Volume 38 Issue 5

Jul. 2018

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WU Junfeng, ZOU Shikun, ZHANG Yongkang, SUN Guifang, NI Zhonghua, CAO Ziwen, CHE Zhigang. Spall of Ti17 alloy induced by laser shock peening with multiple shots[J]. Explosion And Shock Waves, 2018, 38(5): 1091-1098. doi: 10.11883/bzycj-2017-0082

Citation:

WU Junfeng, ZOU Shikun, ZHANG Yongkang, SUN Guifang, NI Zhonghua, CAO Ziwen, CHE Zhigang. Spall of Ti17 alloy induced by laser shock peening with multiple shots[J]. Explosion And Shock Waves, 2018, 38(5): 1091-1098. doi: 10.11883/bzycj-2017-0082

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Spall of Ti17 alloy induced by laser shock peening with multiple shots

doi: 10.11883/bzycj-2017-0082

1.
School of Mechanical Engineering, Southeast University, Nanjing 211189, Jiangsu, China
2.
Science and Technology on Power Beam Processes Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China
3.
School of Electro-mechanical Engineering, Guangdong University of Technology, Guangzhou 510000, Guangdong, China

Received Date: 2017-03-16
Rev Recd Date: 2017-07-10
Publish Date: 2018-09-25

Abstract

Abstract

In order to investigate spalling response and the spall threshold of Ti17 alloy under laser shock peening (LSP), the surface of a 5 mm-thick sample was shocked by multiple laser shots with the shot number ranging one to eight shots. The laser employed has a repetition rate of 1 Hz, the pulse width of 15 ns, the pulse energy of 30 J, and the spot size of 4 mm×4 mm. The surface morphology, the internal damage and the spall morphology after LSP were characterized by non-contact optical profiler, ultrasonic nondestructive testing technique and scanning electron microscope, respectively. The results indicate that the increment of the shot number from four to five results in increasing the depression depth of the surface up to 64.5%. The spall threshold is reached by LSP with continuous five shots. The spall thickness observed after LSP with five to eight shots ranges from 280 μm to 310 μm. The spall mechanism is due to the nucleation, growth and coalescence of the ductile micro-voids, leading to intragranular failure and transgranular failure. This work may provide valuable information for the optimization of integrated blisk rotators with LSP.
- laser shock peening,
- Ti17 alloy sample,
- spall characteristic,
- spall threshold,
- ultrasonic nondestructive testing

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References(20)

References

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