锻压技术

锻态镍钛合金的热变形行为

英文标题：Hot deformation behavior of forged Ni-Ti alloy

作者：王臻徐效文

单位：中南大学

分类号：TG139

出版年,卷(期):页码：2018,43(10):167-175

摘要：

采用Gleeble-3800热压缩模拟实验机，对锻态镍钛合金进行等温热压缩实验，研究其热变形行为，实验条件为应变速率0.01~10.00 s-1，变形温度650~1050 ℃。实验得出了镍钛合金在热压缩过程中的应力-应变曲线，分析了应变对材料变形常数的影响，并根据实验数据建立了锻态镍钛合金热变形过程中流动应力与变形温度、应变速率和应变量的本构关系，从而确定了锻态镍钛合金在热压缩变形时的热变形激活能Q和结构因子A。并利用热加工图，确定了锻态镍钛合金在成形过程中的安全加工温度。通过实验表明：锻态镍钛合金的热变形激活能Q为222.540 kJ·mol-1，锻态镍钛合金较佳的热变形温度范围为850~920 ℃，应变速率低于1.00 s-1。

The isothermal compression test of forged Ni-Ti alloy was conducted by thermo-compression simulator Gleeble-3800 with the strain rate of 0.01-10.00 s-1 and the deformation temperature of 650-1050 ℃, and the hot deformation behavior of forged Ni-Ti alloy was studied. Then, the stress-strain curve of Ni-Ti alloy in the hot compression process was obtained by experiment, and the influence of strain on the deformation constant of material was analyzed. Furthermore, the constitutive relationships between the flow stress and the deformation temperature, strain rate and strain in the hot deformation process of forged Ni-Ti alloy were established based on experiment data to determine the hot deformation activation energy Q and the structure factor A in the hot compression deformation of forged Ni-Ti alloy, and the safe processing temperature in the forming process of forged NiTi alloy was determined by hot processing map. The results show that the hot deformation activation energy Q of forged Ni-Ti alloy is 222.540 kJ·mol-1, the better hot deformation temperature range is 850-920 ℃, and the strain rate is lower than 1.00 s-1.

基金项目：

甘肃省科技重大专项计划（17ZD2GC011）

王臻(1993-)，男，硕士研究生，E-mail：627730942@qq.com；通讯作者：徐效文(1978-)，男，博士，副教授，E-mail：76267602@qq.com

参考文献：

[1]徐祖耀.形状记忆材料[M].上海:上海交通大学出版社,2000.

Xu Z Y. Shape Memory Materials[M]. Shanghai: Shanghai Jiao Tong University Press, 2000.

[2]赵连城,蔡伟,郑玉峰.合金的记忆效应与超弹性[M].北京:国防工业出版社,2002.

Zhao L C, Cai W, Zheng Y F. Memory Effect and Superelasticity of Alloys[M]. Beijing: National Defense Industry Press, 2002.

[3]王心美,岳珠峰,王亚芳.NiTi合金的超弹性力学特性及其应用[M].北京:科学出版社,2009.

Wang X M, Yue Z F, Wang Y F. Superelastic Mechanical Properties of NiTi Alloy and Its Application [M]. Beijing: Science Press, 2009.

[4]Xiao Y, Zeng P, Lei L P, et al. Insitu observation on temperature dependence of martensitic transformation and plastic deformation in superelastic NiTi shape memory alloy[J]. Materials & Design, 2017,134:111-120.

[5]雷文光,赵永庆，韩栋, 等.钛及钛合金熔炼技术发展现状[J].材料导报,2016,30(5)：101-106.

Lei W G, Zhao Y Q, Han D, et al. Development of melting technology for titanium and titanium alloys[J]. Materials Review, 2016, 30(5):101-106.

[6]Zhang Y Q, Jiang S Y, Zhao Y N, et al. Constitutive equation and processing map of equiatomic NiTi shape memory alloy under hot plastic deformation[J]. Transactions of Nonferrous Metals Society of China, 2016, 26(8): 2152-2161.

[7]Morakabati M, Kheirandish S, Aboutalebi M, et al. A study on the hot workability of wrought NiTi shape memory alloy[J]. Materials Science & Engineering A, 2011, 528(18): 5656-5663.

[8]张红钢,何勇,刘雪峰，等. NiTi形状记忆合金热压缩变形行为及本构关系[J].金属学报, 2007，43(9)：930-936.

Zhang H G, He Y, Liu X F, et al. Hot deformation behavior and constitutive relationship of NiTi shape memory alloy during compression at elevated temperatures[J]. Acta Metallurgica Sinica, 2007, 43(9): 930-936.

[9]Yeom J T, Kim J H, Hong J K, et al. Hot forging design of ascast NiTi shape memory alloy[J].Materials Research Bulletin, 2014, 58(6): 234-238.

[10]Dehghani K, Khamei A A. Hot deformation behavior of 60Nitinol (Ni 60 wt%-Ti 40 wt%) alloy: Experimental and computational studies[J].Materials Science and Engineering A, 2010, 527 (3):684-690.

[11]Shu X Y, Lu S Q, Wang K L, et al. A comparative study on constitutive equations and artificial neural network model to predict high temperature deformation behavior in nitinol 60 shape memory[J].Journal of Materials Research,2015，30(12):1988-1998.

[12]Pu E X, Zheng W J, Xiang J Z, et al. Hot deformation characteristic and processing map of superaustenitic stainless steel S32654[J]. Materials Science and Engineering, 2014, 598:174-182.

[13]Etaati A, Dehghani H. A study on hot deformation behavior of Ni42.5Ti7.5Cu alloy[J]. Materials Chemistry & Physics, 2013, 140(1): 208-215.

[14]Wang J G, Liu F S, Cao J M. The microstructure and thermomechanical behavior of Ti50Ni47Fe2.5Nd0.5 shape memory alloys[J]. Materials Science and Engineering, 2010, 527 (23): 6200-6204.

[15]邱伟, 鲁世强, 欧阳德来, 等. 锻态TB6钛合金热变形行为及组织演变[J].塑性工程学报，2010，17(3)：39-42.

Qiu W, Lu S Q, Ouyang D L, et al. Investigation on the hot temperature deformation behavior and microstructure evolution of forged titanium alloy TB6 [J]. Journal of Plasticity Engineering, 2010,17(3):39-42.

[16]Nayan Niraj, Murty Narayana S V S, Sumit Chhangani, et al. Effect of temperature and strain rate on hot deformation behavior and microstructure of AlCuLi alloy[J]. Journal of Alloys and Compounds, 2017, 723 (5):548-558.

[17]Mcqueen H J, Ryan N D. Constitutive analysis in hot working[J]. Materials Science and Engineering, 2002, 322 (1-2):43-63.

[18]张伟红,张士宏.NiTi合金热压缩实验数据的修正及其本构方程[J].金属学报, 2006，42 (10)：1036-1040.

Zhang W H, Zhang S H. Correction of hot compression test data and constitutive equation of NiTi alloy[J]. Acta Metallurgica Sinica, 2006, 42 (10):1036-1040.

[19]任树兰,刘建生,李景丹,等.316LN钢ESR材料热变形行为及高温塑性本构方程[J].锻压技术，2017，42 (10):163-169.

Ren S L, Liu J S, Li J D, et al. Thermal deformation behavior and high temperature plastic constitutive equation of ESR steel 316LN[J]. Forging ＆ Stamping Technology, 2017, 42 (10): 163-169.

[20]Momeni A, Dehghani K, Ebrahimi G R. Modeling the initiaton of dynamic recrystallization using a dynamic recovery model[J]. Journal of Alloys Compounds, 2011, 509(39): 9387-9393.

[21]曹宇,邸洪双,张敬奇, 等.800H合金热变形行为及热加工性能研究[J]. 金属学报，2013，49(7)：811-821.

Cao Y, Di H S, Zhang J Q, et al. Research on hot deformation behavior and hot workability of alloy 800H[J]. Acta Metallurgica Sinica, 2013, 49(7): 811-821.

[22]于辉,刘帅帅,刘利刚,等.TA17 钛合金热力学行为及加工特性研究[J].稀有金属，2017，41 (1): 1-7.

Yu H, Liu S S, Liu L G, et al. Hot mechanical behavior and deformability of TA17 titanium alloy[J].Chinese Journal of Rare Metals, 2017, 41 (1): 1-7.

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