Effects of Different Cooling Methods on Microstructure and Mechanical Properties of TC4 Alloy
In order to investigate the influence of the microstructure obtained by different heat treatments on the mechanical properties, TC4 alloy were heated at 1050 °C for 5 min and cooled to room temperature through different cooling methods (furnace cooling, open-door furnace cooling, air cooling and water cooling). Subsequently, the microstructure was observed and the corresponding mechanical properties were measured. The experimental results showed that with the increase of cooling rate, the microstructure (α + β) became smaller and finer, and the rough tensile fractures gradually became flat; the elastic limit and tensile strength increased and the plasticity decreased. In the uniform plastic deformation stage, the plastic deformation power reached the maximum (43.50 MJ m−3) for air cooling. In the necking stage, the plastic deformation power was the maximum for furnace cooling and the static toughness reached 110.82 MJ m−3. TC4 alloy obtained good comprehensive properties in the case of furnace cooling.
KeywordsTC4 Cooling method Microstructure Mechanical properties Static toughness
This work was supported by Guizhou major special projects (Contract Number  6013); Guizhou engineering research center project (Contract Number  016).
- 1.S. Malinov et al, In situ high temperature microscopy study of the surface oxidation and phase transformations in titanium alloys, J. Microsc. 207 (2002) 163–168.Google Scholar
- 2.Yakovenkova, L.I, Karkina, L.E, Malinov S et al, Dislocation model for brittle fracture in Ti3Al single crystal under basal slip, Bull. Russ. Acad. Sci. 69 (2005) 595–598.Google Scholar
- 3.Zeng Weidong et al, RARE METAL. MAT. ENG. 33 (2004) 1041–1044.Google Scholar
- 4.Xu Xujiao, Tan Yuquan, Gong Lihua, Zhang Lei, Effects of Annealing Temperature and Cooling Rate on Microstructure and Properties of TC4 Titanium Alloy, RARE METAL. MAT. ENG. 11 (2016) 2932–2936.Google Scholar
- 5.Gan Zhanghua, Liang Yu, Wang Jinlin et al, Effect of heat treatment process on Microstructure and hardness of TC4 titanium alloy, T METAL HEAT TREAT. 39 (2014) 36–40.Google Scholar
- 6.Lei Wenguang, Han Dong, Zhang Yongqiang et al, Effects of different heat treatment processes on Microstructure and mechanical properties of TC4-DT titanium alloy bars, MATER. REV. 29 (2015) 120–123.Google Scholar
- 7.Wang Wencai, Li Shuangxiao, Chen Mingye, Effect of heat treatment process on Microstructure and properties of TC4 titanium alloy, Hot Working Technology, 40 (2011) 181–183.Google Scholar
- 8.Zhang Xiyan, Zhao Yongqing, Bai Chenguang. Titanium Alloys and Applications, Chemical Industry Press, Beijing, 2005.Google Scholar
- 9.Wang Jinlin, Zhang Hua, Chen Yiming et al, WELD. J. 32 (2011) 93–96.Google Scholar
- 10.Zheng Ruiting, Zhang Yonggang, Chen Changqi et al, RARE METAL. MAT. ENG. 32 (2003) 1003–1006.Google Scholar
- 11.Lu Y H, Zhang Y G, Qiao L J, Mater. Sci. Eng., A. 289 (2000) 91–98.Google Scholar
- 12.Mao Pengling, The Fracture Toughness in Titanium Alloys, Shanghai Iron and Steel Research Institute. 3 (1994) 51–54.Google Scholar