中国激光, 2020, 47 (12): 1202006, 网络出版: 2020-11-27   

激光直接沉积TA2/TA15梯度材料弯曲性能的有限元模拟 下载: 1013次

Finite Element Simulation on Bending Properties of TA2/TA15 Gradient Material by Laser Direct Deposition
作者单位
1 北京航空航天大学材料科学与工程学院, 大型金属构件增材制造国家工程实验室, 北京 102206
2 煜鼎增材制造研究院有限公司, 北京 100025
摘要
采用激光直接沉积技术制备TA2/TA15梯度材料,研究了该梯度材料的显微组织演变及弯曲性能,并通过有限元模拟重点探讨了弯曲过程中梯度过渡区不同成分合金的应力-应变行为。结果表明:由底部TA15合金向上过渡至TA2合金时,微观组织由网篮α+β相逐渐向单相α相过渡,合金元素种类和β相体积分数逐渐减少,α相体积分数逐渐增加。随着Al元素含量增加,显微硬度增大,抗弯强度由964 MPa增大至2156 MPa。有限元应力场模拟结果表明,试样在弯曲变形过程中,顶部受到压应力作用,底部受到拉应力作用。与TA15试样相比,Al元素含量减少会降低梯度材料的抗弯强度,但会大幅提升其塑性能力,并实现应力均匀过渡。在所有的试样中,GZ-3试样的综合性能最优。
Abstract
TA2/TA15 gradient material was prepared using the laser direct deposition technique. The microstructural evolution and bending properties of this material were investigated, and the stress-strain behaviors of the gradient-transition zone with different compositions were discussed by finite-element simulation. The results show that when the alloy composition transitions from TA15 of bottom to TA2, the microstructure gradually changes from an α+β basket-weave phase to a single-α phase, the types of alloy elements and β-phase volume fraction gradually decrease, and the α-phase volume fraction gradually increases. The microhardness and bending strength increase with the increase of Al-element content and the bending strength gradually increases from 964 MPa to 2156 MPa. The finite element stress field simulation results show that the top is subjected to compressive stress and the bottom is subjected to tensile stress during bending deformation of the specimen. Compared with the TA15 sample, the decrease of Al content will reduce the bending strength of the gradient material but greatly improve the plastic ability and achieve the uniform stress transition. Among all the samples, GZ-3 has the best comprehensive properties.

胡悦, 刘莎莎, 程序, 刘栋. 激光直接沉积TA2/TA15梯度材料弯曲性能的有限元模拟[J]. 中国激光, 2020, 47(12): 1202006. Hu Yue, Liu Shasha, Cheng Xu, Liu Dong. Finite Element Simulation on Bending Properties of TA2/TA15 Gradient Material by Laser Direct Deposition[J]. Chinese Journal of Lasers, 2020, 47(12): 1202006.

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