Effect of annealing on microstructure and properties of TC4 alloy rolled sheet made from sponge titanium/electrolytic titanium

doi:10.13251/j.issn.0254-6051.2020.08.026

Abstract

Abstract: Sponge titanium and electrolytic titanium were used as raw materials for making TC4 titanium alloy. The smelted ingot was hot rolled and annealed to study the microstructure and mechanical properties after different raw material ingot rolling. The results show that the stress relief annealing has little effect on the microstructure of electrolytic titanium and titanium sponge TC4 alloy sheet. After recrystallization annealing, both the electrolytic titanium and the sponge titanium TC4 alloy plate have recrystallized, producing equiaxed α phase, while the electrolytic titanium TC4 alloy has a higher degree of equiaxification and a more uniform internal structure. The stress relief effect of the sponge titanium TC4 alloy sheet after annealing at 550 ℃ is better than that of the electrolytic titanium TC4 alloy, and its strength is slightly reduced, but the improvement of plasticity is more obvious. The recrystallization effect of electrolytic titanium TC4 alloy plate after annealing at 800 ℃ is better than that of sponge titanium TC4 alloy, its strength is slightly reduced, but the plasticity is greatly improved. The fracture mode of the two titanium alloy sheets after annealing is all ductile fracture. The hardness of the sponge titanium TC4 alloy plate is reduced after annealing, but the hardness of the electrolytic titanium TC4 alloy plate is increased after annealing.

Key words: sponge titanium, electrolytic titanium, TC4 alloy, annealing, microstructure, mechanical properties

CLC Number:

TG156.2

Tan Cong, Fan Yongbin, Yu Kun, Xiao Han, Zhang Hongyu, Huang Haiguang, Zhou Rongfeng. Effect of annealing on microstructure and properties of TC4 alloy rolled sheet made from sponge titanium/electrolytic titanium[J]. Heat Treatment of Metals, 2020, 45(8): 137-141.

References

[1]赵永庆. 国内外钛合金研究的发展现状及趋势[J]. 中国材料进展, 2010, 29(5): 1-8.
Zhao Yongqing. Current situation and development trend of titanium alloy[J]. Materials China, 2010, 29(5): 1-8.
[2]Luo Yumeng, Liu Jinxu, Li Shukui, et al. Effect of hot-rolling temperature on microstructure and dynamic mechanical properties of Ti-6Al-4V alloy[J]. Rare Metal Materials and Engineering, 2018, 47(5): 1333-1340.
[3]Jones R, Raman R K S, Iliopoulos A P, et al. Additively manufactured Ti-6Al-4V replacement parts for military aircraft[J]. International Journal of Fatigue, 2019, 124: 227-235.
[4]Costa B C, Tokuhara C K, Rocha L A, et al. Vanadium ionic species from degradation of Ti-6Al-4V metallic implants: In vitro cytotoxicity and speciation evaluation[J]. Materials Science and Engineering C, 2019, 96: 730-739.
[5]王琛, 刘文博, 李涛. 热处理对航空用TC4合金组织与性能的影响[J]. 金属热处理, 2018, 43(8): 107-110.
Wang Chen, Liu Wenbo, Li Tao. Effect of heat treatment on microstructure and mechanical properties of TC4 alloy for aviation application[J]. Heat Treatment of Metals, 2018, 43(8): 107-110.
[6]冯秋元, 张磊, 庞洪, 等. 低成本TC4钛合金板材的组织和性能[J]. 金属热处理, 2016, 41(6): 85-88.
Feng Qiuyuan, Zhang Lei, Pang Hong, et al. Microstructure and properties of low cost TC4 titanium alloy sheet[J]. Heat Treatment of Metals, 2016, 41(6): 85-88.
[7]李斌, 冯秋元, 张磊, 等. 热处理对低成本TC4合金板材组织和性能的影响[J]. 中国钛业, 2014(4): 29-32.
Li Bin, Feng Qiuyuan, Zhang Lei, et al. Effects of heat treatment on microstructure and properties of low cost TC4 titanium alloy sheets[J]. China Titanium Industry, 2014(4): 29-32.
[8]李育贤, 杨丽春. 3150KWB BMO-01型大功率电子束冷床炉熔炼TC4钛合金[J]. 有色金属(冶炼部分), 2017(3): 58-61.
Li Yuxian, Yang Lichun. Smelting TC4 titanium alloy with EBCHM 3150KWB BMO-01 electronic beam cooling bed[J]. Nonferrous Metals (Extractive Metallurgy), 2017(3): 58-61.
[9]刘玉芹, 丁浩, 谢迪. 中国钛资源与海绵钛加工环境效应[J]. 地学前缘, 2014, 21(5): 281-293.
Liu Yuqin, Ding Hao, Xie Di. Titanium resource and the environmental effects of sponge titanium production in China[J]. Earth Science Frontiers, 2014, 21(5): 281-293.
[10]黄正阳, 郭子静, 文光平, 等. 不同工艺退火后TC4合金的力学性能[J]. 金属热处理, 2015, 40(9): 175-179.Huang Zhengyang, Guo Zijing, Wen Guangping, et al. Mechanical properties of TC4 alloy annealed with different processes[J]. Heat Treatment of Metals, 2015, 40(9): 175-179.
[11]Shahmir H, Langdon T G. Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys[J]. Acta Materialia, 2017, 141: 419-426.
[12]张嫦娟. TC4钛合金在小温度范围退火时的力学性能演变[J]. 热加工工艺, 2016, 45(24): 239-240.
Zhang Changjuan. Evolution ofmechanical properties of TC4 titanium alloy during annealing at smaller temperature range[J]. Hot Working Technology, 2016, 45(24): 239-240.
[13]徐戊矫, 谭玉全, 龚利华, 等. 退火温度和冷却速率对TC4钛合金组织和性能的影响[J]. 稀有金属材料与工程, 2016, 45(11): 2932-2936.
Xu Wujiao, Tan Yuquan, Gong Lihua, et al. Effect of annealing temperature and cooling rate on microstructure and properties of TC4 titanium alloy[J]. Rare Metal Materials and Engineering, 2016, 45(11): 2932-2936.
[14]鲍学淳, 程礼, 陈煊, 等. 热处理工艺对TC4钛合金组织和力学性能的影响[J]. 金属热处理, 2019, 44(6): 137-140.
Bao Xuechun, Cheng Li, Chen Xuan, et al. Effect of heat treatment process on microstructure and mechanical properties of TC4 titanium alloy[J]. Heat Treatment of Metals, 2019, 44(6): 137-140.
[15]宫旭辉, 王宇, 夏源明, 等. TC21钛合金的高温动态拉伸力学行为[J]. 中国有色金属学报, 2010, 20(4): 647-654.
Gong Xuhui, Wang Yu, Xia Yuanming, et al. Dynamic tensile behavior of TC21 titanium alloys at elevated temperatures[J]. The Chinese Journal of Nonferrous Metals, 2010, 20(4): 647-654.