Effects of substrate heating on the microstructure and hardness of TiB/Ti6Al4V-ELI during laser in-situ metal deposition

  • P M Lekoadi Council for Scientific and Industrial Research
  • M Tlotleng Council for Scientific and Industrial Research
  • B N Masina Council for Scientific and Industrial Research

Abstract

This work investigated the influence of heating temperature (°C) on the microstructure and microhardness of TiB/Ti6Al4V-ELI composite clads that were produced via in-situ alloying using laser metal deposition technique. The samples were produced on a Ti6Al4V base plates which were heated at different temperatures (25°C, 200°C, 300°C, 400°C and 500°C) before they were characterised for microstructure and hardness. It was found that the TiB/Ti6Al4V-ELI sample that was produced on a non-pre-heated base plate was characterized by TiB particles and had the lowest hardness of 511 ± 66 HV. Base plate heating resulted in the formation of TiB whiskers that were dispersed within the titanium matrix. 200°C led to a microstructure with clusters of TiB whiskers hence it had an increased hardness of 651 ± 40 HV. A fine microstructure with homogeneous distribution of the TiB whiskers was obtained at 500°C base plate heating temperature and had hardness of 565 ± 14 HV.

Author Biographies

P M Lekoadi, Council for Scientific and Industrial Research

Council for Scientific and Industrial Research (CSIR), Manufacturing, National Laser Centre, Laser Enabled Manufacturing Group, P O Box 395, Pretoria 0001, South Africa

M Tlotleng, Council for Scientific and Industrial Research

Council for Scientific and Industrial Research (CSIR), Manufacturing, National Laser Centre, Laser Enabled Manufacturing Group, P O Box 395, Pretoria 0001 and Department of Mechanical Engineering Science, University of Johannesburg, Auckland Park Campus, Johannesburg 2012, South Africa

B N Masina, Council for Scientific and Industrial Research

Council for Scientific and Industrial Research (CSIR), Manufacturing, National Laser Centre, Laser Enabled Manufacturing Group, P O Box 395, Pretoria 0001, South Africa

Published
2022-01-24
How to Cite
Lekoadi, P., Tlotleng, M., & Masina, B. (2022). Effects of substrate heating on the microstructure and hardness of TiB/Ti6Al4V-ELI during laser in-situ metal deposition. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt;, 40(1), 60-65. Retrieved from http://satnt.co.za/index.php/satnt/article/view/879
Section
Conference of the South African Advanced Materials Initiative