Abstract
The plastic deformation behavior and microscopic strengthening mechanism of Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si (TC6) titanium alloy treated by the combination of cryogenic pre-treatment (CT) and laser peening (LP) during a high-temperature tensile testing were investigated. The residual stress and full-width-half-maximum (FWHM) values were determined by X-ray diffraction. In addition, micro-structural evolution in the subsurface was characterized by optical microscopy (OM) and transmission electron microscopy (TEM). It was found that the yield strength of CT-LPed samples was 14.09, 29.46, and 23.37 pct higher than that of the LPed samples at 400 °C, 500 °C, and 600 °C, respectively, due to less thermal relaxation of compressive residual stress (CRS) and more refined grains. Furthermore, widely distributed dislocation walls and tangled dislocations in CT-LPed samples verified the strengthening effects induced by the combination of CT and LP. A novel “paw-shaped” structure which was adhered stably on the grain boundaries was a direct evidence of the strengthening effects. The unmovable dislocation jogs generated by multi-direction dislocation movement and the cross-slip structure were believed to be two important factors to improve the high-temperature strength of TC6 titanium alloy.
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Acknowledgments
The authors are grateful for the financial support from the National Natural Science Foundation of China (Nos. 51775252, 51405204), China Postdoctoral Science Foundation Funded Project (2018M630526), Six Talent Peaks Project in Jiangsu Province (GDZB-050), Opening Project of Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control (JSKLEDC201503), and Youth Key Teacher Training Project of Jiangsu University (2016016).
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Manuscript submitted November 15, 2019.
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Sheng, J., Huang, S., Liu, M. et al. Improving High-Temperature Strength of Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si Titanium Alloy by Cryogenic Pre-treatment and Laser Peening. Metall Mater Trans A 51, 3601–3613 (2020). https://doi.org/10.1007/s11661-020-05789-y
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DOI: https://doi.org/10.1007/s11661-020-05789-y