A novel rare earth (RE)-salt bath nitriding of TC21-DT titanium alloy was primarily developed by adding certain amount of RE cerium oxide (CeO2) in KNO3 and NaNO3 salt bath, heated to temperatures in the range 590–650°C for periods up to 5 h in an ambient furnace atmosphere. The results showed that Ti phases and titanium nitride phase were formed on the surface of RE added samples; while no titanium nitride phases formed on the surface of conventional one, without RE addition. Furthermore, the surface hardness of nitrided samples, incorporated with RE addition, was about two times higher than that of conventional one (340HV0.01). The main improvement mechanism was analysed as well.
LiuFC, MaoYQ, LinX, . Microstructure and high temperature oxidation resistance of Ti–Ni gradient coating on TA2 titanium alloy fabricated by laser cladding. Opt Laser Technol. 2016;83:140–147. doi: 10.1016/j.optlastec.2016.04.005
2.
LinN, HuangX, ZhangX, . In vitro assessments on bacterial adhesion and corrosion performance of TiN coating on Ti6Al4V titanium alloy synthesized by multiarc ion plating. Appl Surf Sci. 2012;258:7047–7051. doi: 10.1016/j.apsusc.2012.03.163
3.
ShiZF, GuoHZ, LiuR, . Microstructure and mechanical properties of TC21 titanium alloy by near-isothermal forging. Trans Nonferr Metal Soc. 2015;25:72–79. doi: 10.1016/S1003-6326(15)63580-4
4.
LiGJ, PengQ, LiC, . Microstructure analysis of 304L Austenitic stainless steel by QPQ complex salt bath treatment. Mater Charact. 2008;59:1359–1363. doi: 10.1016/j.matchar.2007.09.011
ZhuYS, LuWZ, ZuoDW, . Microstructure and tribological properties of REs borided TC21 alloy. Sur Eng. 2014;30:612–618. doi: 10.1179/1743294414Y.0000000292
7.
ZhuYS, LuWZ, ZuoDW, . Effects of rare earth additions during surface boriding on microstructure and properties of titanium alloy TC21. Mater Sci Tech-Lond. 2014;30:1765–1769. doi: 10.1179/1743284713Y.0000000455
8.
ZhuYS, LuWZ, ZuoDW, . Characteristics of RE-B surface diffusion process on the new damage tolerance TC21 alloy. Rare Metal Mater Eng. 2014;43:692–697. doi: 10.1016/S1875-5372(14)60126-0
9.
ZhuYS, LuWZ, SunYL, . Effect of rare earth addition on diffusion kinetics of borided TC21-DT titanium alloy. Sur Eng. 2016. doi:10.1080/02670844.2016.1178413.
10.
ShaoH, ShanD, ZhaoYQ, . Accordance between fracture toughness and strength difference in TC21 titanium alloy with equiaxed microstructure. Mater Sci Eng A. 2016;664:10–16. doi: 10.1016/j.msea.2016.02.088
