Founding Research Journal

Founding Research Journal

The Effect of Surface Severe Plastic Deformation on Microstructure and ‎Mechanical Properties of Pure Titanium Produced by Selective Laser Melting

Document Type : Original Research Article

Authors
1 PhD Student, Department of Metallurgy and Materials Engineering, Imam Khomeini International University (IKIU), Qazvin, Iran.‎
2 Associate Professor, Department of Metallurgy and Materials Engineering, Imam Khomeini International University (IKIU), Qazvin, Iran.‎
3 Professor, Department of Mechanical Engineering, University of Kashan, Kashan, Iran.‎
4 Assistant Professor, Advanced Materials Processing, Integrated Additive Manufacturing (IAM) Center.‎
10.22034/frj.2023.410269.1181
Abstract
The effect of the 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 results of the microstructural investigation, applying UP reduced the microstructural anisotropy so that the 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 the ultimate shear strength of SLMed CP-Ti sample increased by 27 and 14%, respectively. The growth rate of the yield strength was higher than that of the ultimate strength, indicating a decrease in the UPed samples' shear hardening capacity. The nano-hardness 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.
Keywords
Subjects

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Volume 7, Issue 1 - Serial Number 22
Spring and Summer
Spring 2023
Pages 15-24

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