Journal
VACUUM
Volume 142, Issue -, Pages 45-51Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2017.05.004
Keywords
Ti-6Al-4V alloy; Surface mechanical attrition treatment; Low-temperature nitriding; Hardness; Toughness
Funding
- National High Technology Research and Development Program [2012AA03A508]
- National Natural Science Foundation of China [U1360102, 51275344]
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This study focused on developing a beneficial nitriding process for use on Ti-6A1-4V alloy surfaces, involving surface mechanical attrition treatment (SMAT), which does not contaminate the existing nanocrystalline layer. The average grain size of this layer was refined to 10 nm with random crystallographic orientation. Differential scanning calorimetry confirmed that the recrystallization temperature of the Ti-6AI-4V nanocrystalline layer was 550 degrees C. The phase compositions, microstructure, hardness and toughness of the nitrided layer were studied by using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and hardness testing. The nitrided layer of the SMAT sample was composed of nanoscale TiN, Ti2N and Ti with high nitrogen supersaturation. The nitriding kinetics was enhanced by the nanocrystalline layer at relatively low temperatures (600 degrees C). Compared to coarse grained nitrided samples, the SMAT nitrided sample exhibited similar surface hardness but improved surface toughness, which may be attributed to the formation of a nanostructured nitrided layer. (C) 2017 Elsevier Ltd. All rights reserved.
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