双丝+电弧增材制造及热处理制备的镍钛合金的微观结构与力学性能
Microstructure and Mechanical Properties of NiTi Alloy Prepared by Double-Wire + Arc Additive Manufacturing Plus Heat Treatment.
作者信息
Han Jian, Chen Xinya, Zhang Guoyang, Liu Bang, Meng Meiqing, Cai Yangchuan, Jiang Hongbing, Bi Mingjie, Hong Yueqian, Tian Yinbao
机构信息
Advanced Materials Processing and Manufacturing Research Institute, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, China.
Jiangsu Yasheng Metal Products Co., Ltd., Jiangsu, China.
出版信息
3D Print Addit Manuf. 2024 Jun 18;11(3):1008-1015. doi: 10.1089/3dp.2023.0003. eCollection 2024 Jun.
In this study, NiTi shape memory alloy was prepared by double-wire + arc additive manufacturing plus heat treatment using TA1 and ER-Ni welding wires as the raw materials. The results show that the microstructural evolution from the bottom to top is NiTi + NiTi → NiTi + NiTi + NiTi → NiTi + NiTi + NiTi + NiTi + α-Ti. Complex thermal cycles led to the precipitation of NiTi, which improves the hardness of the matrix (B2), and the average hardness value of the top region reaches 550.7 HV. The fracture stress is 2075 ± 138.4 MPa and the fracture strain is 11.2 ± 1.27%. The sample shows 7.02% residual strain and 5.87% reversible strain after 15 cycles, and the stress hysteresis decreases with an increase in cyclic strain.
在本研究中，以TA1和ER-Ni焊丝为原料，通过双丝+电弧增材制造并结合热处理制备了镍钛形状记忆合金。结果表明，从底部到顶部的微观结构演变是NiTi+NiTi→NiTi+NiTi+NiTi→NiTi+NiTi+NiTi+NiTi+α-Ti。复杂的热循环导致NiTi析出，提高了基体（B2）的硬度，顶部区域的平均硬度值达到550.7 HV。断裂应力为2075±138.4 MPa，断裂应变为11.2±1.27%。经过15次循环后，样品显示出7.02%的残余应变和5.87%的可逆应变，并且应力滞后随着循环应变的增加而减小。
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