Selective laser melting of in situ TiN-Ti₅Si₃ composites with RE-Si-Fe addition: comparative study

Author： Gu D D Liu J Meng G B Li C Li Y F Shen Y F

ISSN： 1743-2847

Source： Materials Science and Technology, Vol.27, Iss.11, 2011-11, pp. : 1736-1740

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Abstract

A comparative study was conducted to investigate the influence of rare earth (RE)-Si-Fe addition on the microstructures and tribological properties of in situ TiN-Ti₅Si₃ composites prepared by selective laser melting (SLM). With the addition of 3 wt-% RE-Si-Fe, the shape of in situ TiN reinforcing particles became rounded and smoothened, the particle size was refined and the dispersion state was homogenised. Relative to TiN-Ti₅Si₃ composites without RE addition, the average friction coefficient of SLM processed RE containing composites decreased from 0·85 to 0·55, and the resultant wear rate decreased from 3·79×10⁻⁴ to 2·65×10⁻⁴ mm³ N⁻¹m⁻¹. Metallurgical functions of the RE elements in improving the SLM processability and the resultant wear performance of in situ composites were elucidated.