The effect of surface severe plastic deformation on microstructure and mechanical properties of pure titanium produced by selective laser melting

Articles in Press

Document Type : Original Research Article

Authors

1 Department of Metallurgy and Materials Science, Faculty of Engineering, Imam Khomeini International University, Qazvin, IRAN

2 Imam khomeini international university

3 Department of Mechanical Engineering, Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran

4 Assistant Professor, Department of Management and Production Engineering (DIGEP) and Advanced Materials Processing, Integrated Additive Manufacturing (IAM) Center

10.22034/frj.2023.410269.1181

Abstract

The effect of ultrasonic peening (UP) process at various feed rates was studied on the microstructure and mechanical characteristics of a selective laser melted (SLMed) commercially pure titanium (CP-Ti). According to the microstructural investigations results, applying UP reduced the micstructural anisotropy so that acicular martensite aspect ratio of the SLMed CP-Ti decreased by about 72% (from 16 to 4.5). Also, the surface hardness of the SLMed sample increased by about 70% after applying the UP process at a feed rate of 0.08 mm/rev. Applying UP also improved the shear yield strength and ultimate shear strength of SLMed CP-Ti increased by 27 and 14%, respectively. The growth rate of the yield strength was found to be higher than that of the ultimate strength, which indicates a decrease in the UPed samples shear work hardening capacity. The nanohardness investigations also showed a significant increase in the hardness of samples where the maximum indentation depth of SLMed CP-Ti samples decreased from about 215 to 164 nm after applying the UP process.

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Articles in Press, Accepted Manuscript
Available Online from 11 October 2023

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History

  • Receive Date: 06 August 2023
  • Revise Date: 08 October 2023
  • Accept Date: 11 October 2023

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