Transactions of Materials and Heat Treatment

Title：Comparison on temperature sensitivities for BT25y titanium alloy with two different initial microstructures

Authors： Yang Xuemei1 Yan Xuewei1 Shi Xiaonan2 Guo Hongzhen3

Unit： 1. School of Aeronautical Engineering Zhengzhou Un iversity of Aeronautics 2. School of Civil Aviation Zhengzhou University of Aeronautics 3. School of Materials Science and Engineering Northwestern Polytechnical University

KeyWords： BT25y titanium alloy initial lamellar microstructure initial equiaxed microstructure mechanical behavior temperature sensitivity

ClassificationCode：

year,vol(issue):pagenumber：2022,47(3):211-218

Abstract：

The temperature sensitivities of BT25y titanium alloys with initial lamellar microstructure and initial equiaxed microstructures were studied by thermal simulation compression test. The results show that the deformation temperature has a significant effect on the flow stresses of BT25y titanium alloys with two kinds of initial microstructures, and the flow stress of BT25y titanium alloy with initial lamellar microstructure is obviously greater than that of BT25y titanium alloy with initial equiaxed microstructure at low deformation temperature in two-phase region. The main softening mechanism in initial lamellar microstructure is dynamic globularization, the dynamic recrystallization of α phase occurs in initial equiaxed microstructure, and the dynamic recrystallization of β phase occurs in both initial microstructures when deforming in β phase region. Temperature sensitivity analysis shows that the temperature sensitivity exponent s of BT25y titanium alloy with initial lamellar microstructure decreases with the increasing of deformation temperature and strain rate and achieves the maximum value when deforming at the low temperature of 850-880 ℃ and the small strain rate of 0.001-0.01 s-1, and the s value of BT25y titanium alloy with initial equiaxed microstructure decreases generally with the increasing of deformation temperature, while the change condition with the strain rate is controlled by the deformation temperature.

Funds：

国家自然科学基金资助项目（51904276）；河南省高等学校重点科研项目计划（20A430032）；河南省重点研发与推广专项（202102210212）

杨雪梅（1989-），女，博士，讲师 E-mail：yangxuemei@mail.nwpu.edu.cn

Reference：

[1]高峻, 罗皎, 李淼泉. 航空发动机双性能盘制造技术与机理的研究进展[J]. 航空材料学报, 2012, 32(6): 37-43.

Gao J, Luo J, Li M Q. Advance in manufacture technology and mechanism of aero-engine dual property disk [J]. Journal of Aeronautical Materials, 2012, 32(6): 37-43.

[2]Yang X M, Zhao Z L, Ning Y Q, et al. Microstructural evolution and mechanical property of isothermally forged BT25y titanium alloy with different double-annealing processes [J]. Materials Science & Engineering A, 2019, 745: 240-251.

[3]Yang X M, Guo H Z, Yao Z K, et al. Effect of isothermal forging strain rate on microstructures and mechanical properties of BT25y titanium alloy [J]. Materials Science & Engineering A, 2016, 673: 355-361.

[4]蔺永诚, 肖逸伟, 丁永峰, 等. TC系列钛合金锻造及组织性能调控工艺研究进展[J]. 锻压技术, 2021, 46(9): 22-33.

Lin Y C, Xiao Y W, Ding Y F, et al. Research progress on forging and control technology of microstructure and performance for TC series titanium alloys [J]. Forging & Stamping Technology, 2021, 46(9): 22-33.

[5]Guo B Q, Aranas C, Foul A, et al. Effect of multipass deformation at elevated temperatures on the flow behavior and microstructural evolution in Ti-6Al-4V [J]. Materials Science & Engineering A, 2018, 729: 119-124.

[6]刘章光, 李建辉, 李培杰, 等. Ti-55钛合金板材的超塑性变形及组织演变[J]. 稀有金属, 2017, 41(12): 1285-1292.

Liu Z G, Li J H, Li P J, et al. Superplastic deformation and microstructure evolution of Ti-55 alloy sheet [J]. Chinese Journal of Rare Metals, 2017, 41(12): 1285-1292.

[7]贾宝华, 刘翔, 顾永强, 等. Ti-1100铸态合金的变形行为及本构模型研究[J]. 稀有金属, 2020, 44(10): 1019-1028.

Jia B H, Liu X, Gu Y Q, et al. Deformation behavior and constitutive model of Ti-1100 as-cast alloy [J]. Chinese Journal of Rare Metals, 2020, 44(10): 1019-1028.

[8]李鸿江, 于洋, 宋晓云, 等. 新型Ti-6554钛合金热变形行为及热加工图[J]. 稀有金属, 2020, 44(5): 462-468.

Li H J, Yu Y, Song X Y, et al. Thermal deformation behavior and processing map of a new type of Ti-6554 alloy [J]. Chinese Journal of Rare Metals, 2020, 44(5): 462-468.

[9]韩言, 赵飞, 万明攀, 等. TC17钛合金热流变行为及组织演变机制研究[J]. 稀有金属, 2020, 44(3): 234-241.

Han Y, Zhao M, Wan M P, et al. Thermal flow behaviors and microstructure evolution of TC17 alloy [J]. Chinese Journal of Rare Metals, 2020, 44(3): 234-241.

[10]Liu Y H, Ning Y Q, Yang X M, et al. Effect of temperature and strain rate on the workability of FGH4096 superalloy in hot deformation [J]. Materials and Design, 2016, 95: 669-676.

[11]李理, 周楠. EW94耐热镁合金板材热拉延能力的试验研究[J]. 航空材料学报, 2013, 33(5): 22-28.

Li L, Zhou N. Experimental investigation of hot deep drawability of EW94 heat resistant alloy sheet [J]. Journal of Aeronautical Materials, 2013, 33(5): 22-28.

[12]López J G, Peirs J, Verleysen P, et al. Effect of small temperature variations on the tensile behaviour of Ti-6Al-4V[J]. Procedia Engineering, 2011, 10(7): 2330-2335.

[13]Hao F, Xiao J F, Feng Y, et al. Tensile deformation behavior of a near-α titanium alloy Ti-6Al-2Zr-1Mo-1V under a wide temperature range [J]. Journal of Materials Research and Technology, 2020, 9(3): 2818-2831.

[14]Hu Y J, Huo Y M, He T. Mechanical behavior and microstructure evolution of TC4 alloy during high temperature plastic deformation [J]. Procedia Manufacturing, 2020, 50: 642-646.

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