Numerical Simulation and Residual Stress Control of Multilayer Fused Additives
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摘要: 在多层熔丝增材过程中，高度集中的瞬时热输入将引发相当大的残余应力和变形，因此，研究其残余应力演变规律将对增材工艺设计意义重大。通过植入可控移动焊接热源程序于ABAQUS中，建立了多层熔丝增材有限元模型，分析了熔丝过程中的温度场和残余应力的演变规律，并研究了各工艺参数对多层熔丝增材残余应力的影响规律。结果表明，在一定范围内，在较高的熔丝线能量、较低的熔丝速度和高的预热温度下，残余应力水平较低。Abstract: In the multi-layer fuse-adding process, a great deal of residual stress and deformation will be generated due to the highly concentrated instantaneous heat input. The investigation of residual stress evolution is of the significance to the process design of multi-layer fuse-adding. In this paper, a new welding heat sources were planted in ABAQUS software to establish the three-dimensional model for multi-layer fuse-adding. The temperature and stress fields in the multi-layer fuse-adding process are simulated and analyzed dynamically. In addition, the effects of the fuse-adding parameters including line energy, fuse speed and preheating temperature on the residual stress are also investigated. The results show that the high line energy, low fuse speed and high preheating temperature can reduce effectively the residual stress in a certain range.
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Key words:
- fusing /
- additives /
- temperature field /
- residual stress field
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表 1 Q235钢材料性能参数
温度/℃ 屈服应力/MPa 热膨胀系数/(1/℃) 热导率/(W·(m·℃)-1) 比热/(J·(kg·℃)-1) 20 298 700 000 1.11×10-5 60 460 250 229 102 900 1.26×10-5 50 480 500 80 000 000 1.42×10-5 39 530 800 50 000 000 1.51×10-5 30 675 1 000 34 000 000 1.53×10-5 28 670 1 500 8 000 000 1.62×10-5 50 660 1 700 5 000 000 1.67×10-5 140 780 2 500 800 000 1.74×10-5 142 820 
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表 2 数值模拟工艺参数表
序号 熔丝线能量/(J·mm-1) 预热温度/℃ 熔丝速度/(mm·s-1) 1 2 200 20 8 2 2 200 20 10 3 2 200 20 12 4 2 500 20 8 5 2 800 20 8 6 2 200 100 8 7 2 200 200 8
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