In-situ warm shot peening on Ti-6Al-4V alloy: Effects of temperature on fatigue life, residual stress, microstructure and mechanical properties

Shot peening (SP) is a matured surface enhancement technique to improve fatigue strength and fatigue lives of cyclically loaded metallic components at room temperature. In order to achieve enhanced beneficial effects beyond SP’s conventional performance, SP has been attempted at elevated temperature...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-11, Vol.882, p.160701, Article 160701
Main Authors: Lim, Su Hui, Zhang, Zheng, Seng, Debbie Hwee Leng, Lin, Ming, Teo, Siew Lang, Wei, Fengxia, Cheong, Augustine Kok Heng, Wang, Shijie, Pan, Jisheng
Format: Article
Language:English
Subjects:
Compressive properties
Crystallographic orientation mapping
EBSD
Fatigue life
Fatigue strength
Grain refinement
High temperature
Mechanical properties
Microstructure
Residual stress
Room temperature
Shot peening
Spring steels
Stress distribution
Stress relaxation
Temperature effects
Tensile stress
Thermal softening
Ti-6Al-4V
Titanium base alloys
Warm shot peening
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Summary:Shot peening (SP) is a matured surface enhancement technique to improve fatigue strength and fatigue lives of cyclically loaded metallic components at room temperature. In order to achieve enhanced beneficial effects beyond SP’s conventional performance, SP has been attempted at elevated temperatures or under tensile stress loading on spring steel with some success. In this work, SP on α/β Ti-6Al-4V alloys has been carried out when they were heated at elevated temperatures up to 400 °C. The effects of such in-situ warm SP on fatigue life of Ti-6Al-4V at different temperatures have been evaluated and correlated with respective development in compressive residual stress distribution, microstructure and hardness. The optimum in-situ warm SP condition was achieved at 100 °C after a trade-off between compressive residual stress relaxation and enhanced grain refinement, both of which are affected by thermal softening but to different degrees. [Display omitted] •α/β Ti-6Al-4V coupons were in-situ warm-shot-peened (WSP) at 32, 100, 200 and 300 °C.•Its fatigue performance was correlated with residual stress profile and microstructural changes.•WSP relaxed compressive residual stress (CRS) mildly at 100 °C but severely at 200 & 300 °C.•Surface grains were heavily refined after WSP at 100 °C, but agglomerated at 300 °C.•Optimum WSP is 100 °C for Ti64 with a trade-off between grain refinement and CRS relaxation.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.160701