Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Influence of Successive Chemicals and Thermochemical Treatments on Surface Features of Ti6Al4V Samples Manufactured by SLM

Version 1 : Received: 24 January 2021 / Approved: 25 January 2021 / Online: 25 January 2021 (10:12:21 CET)

A peer-reviewed article of this Preprint also exists.

González, J.E.; Armas, G.; Negrin, J.; Beltrán, A.M.; Trueba, P.; Gotor, F.J.; Peón, E.; Torres, Y. Influence of Successive Chemical and Thermochemical Treatments on Surface Features of Ti6Al4V Samples Manufactured by SLM. Metals 2021, 11, 313. González, J.E.; Armas, G.; Negrin, J.; Beltrán, A.M.; Trueba, P.; Gotor, F.J.; Peón, E.; Torres, Y. Influence of Successive Chemical and Thermochemical Treatments on Surface Features of Ti6Al4V Samples Manufactured by SLM. Metals 2021, 11, 313.

Journal reference: Metals 2021, 11, 313
DOI: 10.3390/met11020313

Abstract

Ti6Al4V samples obtained by selective laser melting were subjected to acid treatment, chemical oxidation in hydrogen peroxide solution and subsequent thermochemical treatment. The effect of temperature and time of acid etching of Ti6Al4V samples on surface roughness, morphology, topography and chemical and phase composition after the thermochemical treatment was studied. The surfaces were characterized using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and contact profilometry. Pore and protrusion sizes were measured. Acid etching modified the elemental composition and surface roughness of the alloy. Temperature had a greater influence on the morphology, topography and surface roughness of samples than time. Increases in roughness values were observed when applying successive chemical oxidation and thermochemical treatment compared to the values observed on surfaces with acid etching. After the thermochemical treatment, the samples with acid etching at a temperature of 80 °C showed a multiscale topography. In addition, a network-shaped structure was obtained on all surfaces, both on their protrusions and pores previously formed during the acid etching.

Keywords

selective laser melting; Ti6Al4V; acid etching; chemical oxidation; thermochemical treatment; surface features.

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