Neutral Molten Salt-Bath Carburizing of Ti6Al4V Alloy with Nanocrystalline Surface Layer at Low Temperature Assisted by Surface Mechanical Attrition Treatment

Abstract:

Nanocrystalline surface layer about 10~15μm thick was fabricated on the surface of Ti6Al4V sheet by means of the surface mechanical attrition treatment (SMAT). The average grain size was about 10nm and the grain characteristic presented equiaxed morphology. The nanocrystalline surface layer could be perfectly maintained below 550°C in the following thermal stability analysis. Neutral salt mixture was about 21% NaCl, 31% BaCl₂ and 48% CaCl₂ and additionally 5% Na₂CO₃ of total was utilized. After carburizing process, a continuous charcoal grey carburized layer was composed of TiC and carbon supersaturated solid solution, the hardening layer was about 10~15μm thick. The hardness of the outermost surface reached 1000HV, which was much higher than its coarse-grained counterpart in the same carburizing condition. The experimental result indicated that the carburizing kinetics was obviously enhanced by nanocrystalline surface layer assistance. Furthermore, the neutral molten salt-bath carburizing was verified that it could be performed in a relatively low temperature of 650°C.

• Periodical: Key Engineering Materials (Volume 727)
• Pages: 1001-1008
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.727.1001
• Online since: January 2017
• Authors: Quan Tong Yao, Wei Ping Tong, Meng Yao Li, Guang Lan Zhang
• Keywords: Carburizing, Nanocrystalline, Neutral Molten Salt-Bath, Ti6Al4V Alloy

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