Journal
VACUUM
Volume 163, Issue -, Pages 52-58Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2018.11.059
Keywords
TB8 titanium alloy; Intermittent vacuum; Gas nitriding; Microstructure; Properties
Funding
- Guizhou Normal University
- National Natural Science Foundation of China [51574096]
- Excellent Youth Science and Technology Talent Training Project of Guizhou [Qian Ke He (2016) 5607]
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TB8 titanium alloy is a new type of metastable beta titanium alloy, an intermittent vacuum gas nitriding (IVGN) process was used to improve its surface hardness and wear resistance. The phase constitution and microstructure of the surface-modified layer were measured by XRD and SEM, and the surface hardness and wear resistance of the treated samples were also analysed. The results showed that the surface activity of the samples was greatly improved and the diffusion of nitrogen into the substrate was promoted by the IVPN process. After the IVPN treatment at 780 degrees C for 4 h, a dense nitrides layer and a nitrogen diffusion zone of considerable depth were formed on the surface of the TB8 titanium alloy. TiN, TiN0.3 and Ti2AlN were the major phases on the nitrided surface. The surface hardness of the IVPN sample reached 850-900 HV, which is three times as that of the substrate. Due to the formation of a gradient hardened layer and the high bonding strength of the nitriding layer with the substrate, the wear resistance was greatly improved.
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