Effect of heat treatment process on microstructure and tensile properties of Ti-55511 titanium alloy

doi:10.13251/j.issn.0254-6051.2024.11.028

Abstract

Abstract: Effect of BASCA (β annealing+slow cooling+aging) treatment on microstructure and tensile properties of the Ti-55511 titanium alloy was analyzed by means of optical microscope (OM), scanning electron microscope (SEM), X-ray diffractometer (XRD) and electron universal testing machine. The results show that after BASC (β annealing+slow cooling) treatment, the size of the primary α phase in the microstructure increases to a certain extent compared to the α phase in the original microstructure of the alloy. The morphology of the primary α phase in the microstructure includes a large number of strip-shaped, a small amount of equiaxed and a few blocky. After BASCA treatment, the β transformation structure in the alloy is obvious, and the microstructure becomes more uniform and stable. BA (β annealing) temperature affects the size, morphology and content of the α phase in the microstructure. The strength of the alloy increases with the increase of BA temperature, while the plasticity shows the opposite trend. The tensile fracture morphology of the alloy treated by BASC process is mainly dimples, and the dimple is large and deep. With the increase of BA temperature, the tear ridge appearance in the fracture becomes more and more obvious. It is found that there are secondary cracks in the fracture after BASCA treatment, and the fracture presents a rugged morphology with high and low fluctuations.

Key words: Ti-55511 titanium alloy, BASCA process, microstructure, tensile properties, fracture morphology

CLC Number:

TG156.1

Zhai Xinjiao, Zhang Mingyu, Song Yixin, Yue Xu, Tong Xiaole. Effect of heat treatment process on microstructure and tensile properties of Ti-55511 titanium alloy[J]. Heat Treatment of Metals, 2024, 49(11): 185-190.

References

[1]肖寒, 于佳新, 张宏宇, 等. 退火温度对新型高强耐蚀钛合金组织与性能的影响[J]. 稀有金属材料与工程, 2022, 51(3): 947-952.
Xiao Han, Yu Jiaxin, Zhang Hongyu, et al. Effects of annealing temperature on microstructure and properties of new high strength corrosion resistant titanium alloy[J]. Rare Metal Materials and Engineering, 2022, 51(3): 947-952.
[2]李志尚, 陈立全, 杨平, 等. TC18钛合金棒材锻造时拔长过程织构模拟[J]. 塑性工程学报, 2021, 28(9): 94-102.
Li Zhishang, Chen Liquan, Yang Ping, et al. Simulation of texture in drawing of TC18 titanium alloy bars during forging[J]. Journal of Plasticity Engineering, 2021, 28(9): 94-102.
[3]Cui Yimin, Zheng Weiwei, Hua Chao, et al. Effectiveness of hot deformation and subsequent annealing for β grain refinement of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy[J]. Rare Metals, 2021, 40(12): 3608-3615.
[4]牟芃威, 吕书锋, 杜赵新. 固溶和时效温度对铸态TC18合金组织性能的影响[J]. 钢铁钒钛, 2023, 44(2): 61-66.
Mou Pengwei, Lü Shufeng, Du Zhaoxin. Effects of solution and aging temperature on microstructure and properties of as-cast TC18 alloy[J]. Iron Steel Vanadium Titanium, 2023, 44(2): 61-66.
[5]辛宏靖, 廖敏茜, 王潇汉, 等. 初生α相含量对TC18时效组织及力学性能的影响[J]. 精密成形工程, 2021, 13(3): 143-147.
Xin Hongjing, Liao Minxi, Wang Xiaohan, et al. Effect of volume fraction of primary α phase on mechanical property in TC18 alloy[J]. Journal of Netshape Forming Engineering, 2021, 13(3): 143-147.
[6]张颖, 胡生双, 郑超, 等. 双重退火对激光增材制造TC18钛合金组织和性能的影响[J]. 特种铸造及有色合金, 2021, 41(8): 1006-1009.
Zhang Ying, Hu Shengshuang, Zheng Chao, et al. Effects of double annealing on microstructure and properties of TC18 titanium alloy by laser additive manufacturing[J]. Special Casting and Nonferrous Alloys, 2021, 41(8): 1006-1009.
[7]张翥, 王群骄, 莫畏. 钛的金属学和热处理[M]. 北京: 冶金工业出版社, 2009: 46-220.
[8]辛社伟, 赵永庆. 钛合金固态相变的归纳与讨论(Ⅵ)—阿尔法[J]. 钛工业进展, 2013, 30(4): 1-8.
Xin Shewei, Zhao Yongqing. Inductions and discussions of solid state phase transformation of titanium alloy(Ⅵ)-Alpha[J]. Titanium Industry Progress, 2013, 30(4): 1-8.
[9]辛社伟. 钛合金固态相变的归纳与讨论(Ⅴ)—相与相变谈[J]. 钛工业进展, 2013, 30(3): 12-15.
Xin Shewei. Inductions and discussions of solid state phase transformation of titanium alloy(Ⅴ)-Talking about phase and phase-transformation[J]. Titanium Industry Progress, 2013, 30(3): 12-15.
[10]王琛, 徐栋, 陈力. 热处理对TC18钛合金组织和力学性能的影响[J]. 金属热处理, 2018, 43(9): 186-190.
Wang Chen, Xu Dong, Chen Li. Effect of heat treatment on microstructure and mechanical properties of TC18 titanium alloy[J]. Heat Treatment of Metals, 2018, 43(9): 186-190.
[11]Xu Jianwei, Zeng Weidong, Zhou Dadi, et al. Evolution of coordination between α and β phases for two-phase titanium alloy during hot working[J]. Transactions of Nonferrous Metals Society of China, 2021, 31(11): 3428-3438.
[12]李少强, 陈威, 查友, 等. TC18合金大型锻棒冲击韧性的横纵向差异研究[J]. 稀有金属材料与工程, 2021, 50(3): 911-917.
Li Shaoqiang, Chen Wei, Zha You, et al. Difference between transverse and longitudinal impact toughness of TC18 alloy large-scale forging rods[J]. Rare Metal Materials and Engineering, 2021, 50(3): 911-917.
[13]Chi G, Yi D, Jiang B, et al. Crack propagation during Charpy impact toughness testing of Ti-AlV-Mo-Zr alloy tubes containing equiaxed and lamellar microstructures[J]. Journal of Alloys and Compounds, 2020, 852: 156581.
[14]Wang X, Zhu Z, Lu T, et al. The Influence of forging processing on fatigue crack propagation rate of damage-tolerant titanium alloy[J]. Rare Metals Letters, 2008, 27(7): 12-20.
[15]Guo P, Zhao Y, Hong Q, et al. Fatigue crack propagation and crack tip plasticity zone of TC4-DT titanium alloy[J]. Rare Metal Materials and Engineering, 2014, 43(6): 1479-1482.
[16]Nitin Kotkunde, Hansoge Nitin Krishnamurthy, Pavan Puranik, et al. Microstructure study and constitutive modeling of Ti-6Al-4V alloy at elevated temperatures[J]. Materials & Design, 2014, 54: 96-103.
[17]刘莹莹, 张君彦, 王梦婷, 等. TC18钛合金棒材和锻件的冲击性能及断口分析[J]. 稀有金属, 2019, 43(8): 891-896.
Liu Yingying, Zhang Junyan, Wang Mengting, et al. Impact properties and fracture analysis of TC18 titanium alloy bars and forgings[J]. Chinese Journal of Rare Metals, 2019, 43(8): 891-896.
[18]Liu Z, Li P, Xiong L, et al. High-temperature tensile deformation behavior and microstructure evolution of Ti55 titanium alloy[J]. Materials Science and Engineering A, 2016, 680: 259-269.
[19]Chen Junhong, Xu Weifang, Zhang Fangju, et al. Strain rate dependent tension behavior of TC11 titanium alloys[J]. Rare Metal Materials and Engineering, 2021, 50(6): 1883-1889.
[20]Wang He, Ma Shuyuan, Wang Jiachen, et al. Microstructure and mechanical properties of TA15/TC11 graded structural material by wire arc additive manufacturing process[J]. Transactions of Nonferrous Metals Society of China, 2021, 31(8): 2323-2335.