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Open AccessArticle

Effect of Stress-Relieving Heat Treatment on the High Strain Rate Dynamic Compressive Properties of Additively Manufactured Ti6Al4V (ELI)

1
Department of Mechanical and Mechatronics Engineering, Central University of Technology, Free State, 20 President Brand St, Bloemfontein Central, Bloemfontein 9301, South Africa
2
Department of Mechanical Engineering, Vaal University of Technology, Andries Potgieter Blvd, Vanderbijlpark 1900, South Africa
*
Author to whom correspondence should be addressed.
Metals 2020, 10(5), 653; https://doi.org/10.3390/met10050653
Received: 16 April 2020 / Revised: 8 May 2020 / Accepted: 11 May 2020 / Published: 18 May 2020
A study was undertaken on the compressive high strain rate properties and deformation behaviour of Direct Metal Laser-Sintered (DMLS) Ti6Al4V (ELI) parts in two separate forms: as-built (AB) and stress relieved (SR). The high strain rate compression tests were carried out using a Split Hopkinson Pressure Bar test system at ambient temperature. The average plastic strain rates attained by the system were 400 s−1 and 700 s−1. Comparative analyses of the performance (flow stresses and fracture strains) of AB and SR specimens were carried out based on the results obtained at these two plastic strain rates. Microstructural analyses were performed to study the failure mechanisms of the deformed specimens and fracture surfaces. Vickers microhardness test values were obtained before and after high strain rate compression testing. The results obtained in both cases showed the strain rate sensitivity of the stress-relieved samples to be higher in comparison to those of as-built ones, at the same value of true strain.
Keywords: direct metal laser sintering; Ti6Al4V (ELI); dynamic properties; Split Hopkinson Pressure Bar; flow stress; fracture strain direct metal laser sintering; Ti6Al4V (ELI); dynamic properties; Split Hopkinson Pressure Bar; flow stress; fracture strain
MDPI and ACS Style

Muiruri, A.; Maringa, M.; du Preez, W.; Masu, L. Effect of Stress-Relieving Heat Treatment on the High Strain Rate Dynamic Compressive Properties of Additively Manufactured Ti6Al4V (ELI). Metals 2020, 10, 653.

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