热等静压法制备TiNiNb合金管工艺及其微观组织研究
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摘要
利用热等静压法将TiNiNb预合金粉末制备成了大尺寸TiNiNb合金管(外径35 mm,内径15 mm,高为100 mm)。对制备出的TiNiNb合金管的微观组织、力学性能及马氏体相变行为进行了探究。结果表明,热等静压工艺参数为1 100℃、110 MPa、保温保压3 h时,可制备出微观组织较均匀的大尺寸TiNiNb合金管。热等静压TiNiNb合金管微观组织主要有TiNi基体相、β-Nb相、少量的(Ti,Nb)_2Ni相及TiC相。热等静压态TiNiNb合金管硬度高于锻态TiNiNb合金这可能是存在TiC相导致。在研究其马氏体相变行为时,发现该合金马氏体相变为两步相变,但其马氏体逆相变行为并不明显。
The TiNiNb prealloyed powder was prepared into a large-sized TiNiNb alloy tube(inner diameter of 15 mm, outer diameter of 35 mm, height of 100 mm) by hot isostatic pressing. The microstructure, mechanical properties and martensitic transformation behavior of the prepared TiNiNb alloy tube were investigated. The results show that when the hot isostatic pressure process parameters were 1 373 K, 110 MPa, holding temperature and pressure for 3 h, the large-sized TiNiNb alloy tube with uniform microstructure could be prepared. The microstructure of TiNiNb alloy tube mainly included TiNi matrix phase, β-Nb phase and a small amount of(Ti,Nb)_2Ni phase. The hardness of TiNiNb alloy tubes prepared by hot isostatic pressing was higher than that of forged TiNiNb alloys. The martensitic transformation behaviors of TiNiNb alloy tubes were studied. It was found that the martensite phase transformation of the alloy was a two-step phase transformation, but not obvious.
The TiNiNb prealloyed powder was prepared into a large-sized TiNiNb alloy tube(inner diameter of 15 mm, outer diameter of 35 mm, height of 100 mm) by hot isostatic pressing. The microstructure, mechanical properties and martensitic transformation behavior of the prepared TiNiNb alloy tube were investigated. The results show that when the hot isostatic pressure process parameters were 1 373 K, 110 MPa, holding temperature and pressure for 3 h, the large-sized TiNiNb alloy tube with uniform microstructure could be prepared. The microstructure of TiNiNb alloy tube mainly included TiNi matrix phase, β-Nb phase and a small amount of(Ti,Nb)_2Ni phase. The hardness of TiNiNb alloy tubes prepared by hot isostatic pressing was higher than that of forged TiNiNb alloys. The martensitic transformation behaviors of TiNiNb alloy tubes were studied. It was found that the martensite phase transformation of the alloy was a two-step phase transformation, but not obvious.
引文
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[2] Tong Y X, Jiang P C, Chen F, et al. Microstructure and martensitic transformation of an ultrafine-grained TiNiNb shape memory alloy processed by equal channel angular pressing[J]. Intermetallics, 2014, 49(4):81-86.
[3] Cai W, Meng X L, Zhao L C. Recent development of TiNi-based shape memory alloys[J]. Current Opinion in Solid State & Materials Science, 2005, 9(6):296-302.
[4] Plessis A D, Rossouw P. Investigation of porosity changes in cast Ti6Al4V rods after hot isostatic pressing[J]. Journal of Materials Engineering & Performance, 2015, 24 (8): 3137-3141.
[5] Kim Y, Kim E P, Noh J W, et al. Fabrication and mechanical properties of powder metallurgy tantalum prepared by hot isostatic pressing[J]. International Journal of Refractory Metals & Hard Materials, 2015, 48(48):211-216.
[6] Chung C Y, Ma L W. NiAl shape memory alloy prepared by hot isostatic pressing[J]. Journal De Physique IV, 2003, 112(1):1059-1062.
[7] Wei Zhenwei, Liu Changkui, Gu Yuli, et al. Mechanical properties and fracture characteristics of welded joint in GH536 Ni-based superalloy[J].Journal of Aeronautical Materials, 2015, 35(5):70-74(in Chinese).魏振伟, 刘昌奎, 顾玉丽,等. GH536镍基高温合金焊接接头力学性能与断裂特征研究[J]. 航空材料学报, 2015, 35(5):70-74.
[8] Wu S, Chung C Y, Liu X, et al. Pore formation mechanism and characterization of porous NiTi shape memory alloys synthesized by capsule-free hot isostatic pressing[J]. Acta Materialia, 2007, 55(10):3437-3451.
[9] Yuan B, Chung C Y, Zhang X P, et al. Control of porosity and superelasticity of porous NiTi shape memory alloys prepared by hot isostatic pressing[J]. Smart Materials & Structures, 2005, 14:S201.
[10] Zhang Y P, Yuan B, Zeng M Q, et al. High porosity and large pore size shape memory alloys fabricated by using pore-forming agent (NH4HCO3) and capsule-free hot isostatic pressing[J]. Journal of Materials Processing Technology, 2007, s192-193(10):439-442.
[11] Ma L W, Chung C Y, Tong Y X, et al. Properties of porous TiNbZr shape memory alloy fabricated by mechanical alloying and hot isostatic pressing[J]. Journal of Materials Engineering & Performance, 2011, 20(4-5):783-786.
[12] Ye W U, Meng X L, Wei C, et al. Microstructure and mechanical behaviors of TiNiNb wide hysteresis shape memory alloy wire argon arc welding joint[J]. Material Science & Technology, 2005, 13(3):312-315.
[13] Li J, Wang H, Liu J, et al. Effects of Nb addition on microstructure and mechanical properties of TiNiNb alloys fabricated by elemental powder sintering[J]. Materials Science & Engineering A, 2014, 609(27):235-240.
[14] Huang Y Z, Lu S Q, Liu J W, et al. Effects of annealing on microstructure and phase transformation temperature of NiTiNb shape memory alloy after equal channel angular pressing[J]. Advanced Materials Research, 2013, 690-693:3-7.
[15] Du Z X, Xiao S L, Wang P X, et al. Effects of trace TiB and TiC on microstructure and tensile properties of β titanium alloy[J]. Materials Science & Engineering A, 2014, 596:71-79.
[16] Zhang X Y, Sehitoglu H. Crystallography of the B2→R→B19′ phase transformations in NiTi[J]. Materials Science & Engineering A, 2004, 374(1):292-302.
[17] Yin Yan, Xu Yangtao, Xia Tiandong, et al. Transformation temperature and enthalpy of remelting Ni Ti shape memory alloy[J]. Rare Metal Materials and Engineering, 2013(s2):309-312(in Chinese).尹燕, 徐仰涛, 夏天东,等. 重熔NiTi合金相变温度及相变焓研究[J]. 稀有金属材料与工程, 2013(s2):309-312.