Affiliation:
1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China
2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract
Shot peening (SP) can modify the surface properties of titanium alloys and titanium matrix
composites (TMCs). Based on our previous work in the last ten years, the microstructure and
mechanical properties of SP treated Ti-6Al-4V (TC4) and (TiB+TiC)/TC4 are summarized in this
review. The compressive residual stress (CRS) was formed on the surface after SP. At different SP
intensities, the thickness of the surface CRS layer was improved with increasing SP intensities. During
the stress peening, the CRS increased evidently, and the increment was proportional to the prestress.
Besides, CRS’s thermal relaxation was investigated, which showed that the CRS in the whole
deformation layer was relaxed. The relaxation mechanism could be explained by the Zener-Wert-
Avrami model. The microstrain, the domain size, and the dislocation density of the peened layer
were investigated using the Voigt method. The domain size of TC4 was smaller than the composite,
and the microstrain of the TC4 was higher than the composite. The average dislocation density was
increased after SP due to the existence of reinforcements. Utilizing the Rietveld method to analyze
the microstructure after SP, the variations were similar to the Voigt method’s results. Also, the composite’s
stability was higher than TC4 because of the existence of reinforcements. Hardness analysis
revealed that the existence of reinforcements raised the hardness. In the peened layer, the surface’s
hardness was maximum, and it decreased with the increase in depth. At the same temperature, the
hardness of the TC4 was smaller than the composite counterpart. Finally, the strengthening mechanism
of SP was discussed and summarized based on the above analysis.
Funder
Ministry of Education of China
111 Project
Fundamental Research Funds for the Central Universities
National Natural Science Foundation of China
Publisher
Bentham Science Publishers Ltd.
Subject
Pharmaceutical Science,Biomedical Engineering,Medicine (miscellaneous),Bioengineering,Biotechnology
Cited by
3 articles.
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