Numerical simulation and mechanism study of grain refinement during double pulsed wire arc additive manufacturing
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摘要: 电弧增材制造具有成本低和效率高等优点，然而其晶粒细化的研究鲜有报道. 使用自行研制的熔化极气体保护焊电源实施了双脉冲电弧增材制造试验，通过数值模拟预测了晶粒细化现象，试验结果验证了双脉冲电弧的晶粒细化作用. 结果表明，由于熔池的膨胀，熔池尾部出现了重熔化现象. 在与单脉冲电弧热输入相同时，重熔化现象导致双脉冲电弧能够产生更高的冷却速度，并且细化晶粒. 因此，可以通过改变脉冲参数而不是传统地改变热输入来细化晶粒.Abstract: Arc additive manufacturing has the advantages of low cost and high efficiency. However, there are few reports on grain refinement. Double pulsed arc additive manufacturing experiments were carried out by using self-developed gas metal arc welding equipment, grain refinement phenomenon was predicted by using the cooling rate; experimental results also verified the grain refinement phenomenon. Results indicated that remelting phenomenon occurred near the trailing edge due to the expansion of the molten pool. Therefore, double pulsed arc features higher cooling rate and finer grain than conventional single pulsed arc under same heat input. Grain refinement could be achieved by changing pulsing parameters instead of conventionally changing heat input.
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[1] Miao Yugang, Zeng Yang, Wang Teng, et al. Additive manufacturing process of aluminum/steel dissimilar metal based on BC-MIG welding[J]. Transactions of the China Welding Institution, 2015, 36(7): 5 − 8
[2] 苗玉刚, 曾 阳, 王 腾, 等. 基于BC-MIG焊的铝/钢异种金属增材制造工艺[J]. 焊接学报, 2015, 36(7): 5 − 8 [3] 柏久阳, 范成磊, 杨雨晨, 等. 2219铝合金TIG填丝堆焊成形薄壁试样组织特征[J]. 焊接学报, 2016, 37(6): 124 − 128 [4] Bai Jiuyang, Fan Chenglei, Yang Yuchen, et al. Microstructures of 2219-Al thin-walled parts produced by shaped metal deposition[J]. Transactions of the China Welding Institution, 2016, 37(6): 124 − 128
[5] Zhang Yu, Luo Zhen, Tan Hui, et al. Hybrid 3D processing technology based on build-up welding and electrolytic machining[J]. Transactions of the China Welding Institution, 2015, 36(8): 39 − 42
[6] 张 禹, 罗 震, 谈 辉, 等. 基于堆焊-电解的复合3D加工技术[J]. 焊接学报, 2015, 36(8): 39 − 42 [7] 刘一搏, 孙清洁, 姜云禄, 等. 基于冷金属过渡技术快速成形工艺[J]. 焊接学报, 2014, 35(7): 1 − 4 [8] Liu Yibo, Sun Qingjie, Jiang Yunlu, et al. Rapid prototyping process based on cold metal transfer arc welding technology[J]. Transactions of the China Welding Institution, 2014, 35(7): 1 − 4
[9] 柏久阳, 王计辉, 林三宝, 等. 铝合金电弧增材制造焊道宽度尺寸预测[J]. 焊接学报, 2015, 36(9): 87 − 90 [10] Bai Jiuyang, Wang Jihui, Lin Sanbao, et al. Width prediction of aluminium alloy weld additively manufactured by TIG arc[J]. Transactions of the China Welding Institution, 2015, 36(9): 87 − 90
[11] 柏久阳, 范成磊, 林三宝, 等. 基板散热作用对电弧堆焊成形中熔宽调控的影响[J]. 焊接学报, 2016, 37(3): 115 − 119 [12] Bai Jiuyang, Fan Chenglei, Lin Sanbao, et al. Effects of base-plate's heat sink on the control strategies of weld width during GTA-additive manufacturing[J]. Transactions of the China Welding Institution, 2016, 37(3): 115 − 119
[13] David S A, Vitek J M. Correlation between solidification parameters and weld microstructures[J]. International Materials Rev-iews, 1989, 34(1): 213 − 245.
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