Fatigue strength improvement of selective laser melted Ti6Al4V using ultrasonic surface mechanical attrition

Autor: Shuo Yin, Richard Jenkins, Rocco Lupoi, Min Liu, Jian Lu, Rodolphe Bolot, Xingchen Yan, Hanlin Liao, Chaoyue Chen, Wenyou Ma, Min Kuang
Rok vydání: 2019
Předmět:
Zdroj: Materials Research Letters, Vol 7, Iss 8, Pp 327-333 (2019)
ISSN: 2166-3831
DOI: 10.1080/21663831.2019.1609110
Popis: Ultrasonic surface mechanical attrition treatment (SMAT) was employed to modify the surface microstructural layer of SLM Ti6Al4V ELI biomedical material to improve the fatigue performance. The SMAT method can introduce a nanostructured layer in the SLM sample surface by imposing high-strain-rate plastic deformation. The nanostructured layer improves the mechanical strength of the SMAT-affected zone and induces compressive residual stress parallel with the surface which suppress the initiation of cracks. As a result, the specimen after SMAT exhibits significantly higher fatigue strength than the non-treated sample in both low- and high-cycling regime.
Databáze: OpenAIRE