铝/钢焊接接头界面Fe_2Al_5生长模拟研究
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摘要
基于蒙特卡罗随机模型,模拟铝钢焊接接头界面金属间化合物Fe_2A_5的生长过程。针对Fe_2A_5的特殊晶体结构,通过随机选定Fe_2A_5的c轴方向与形核界面的夹角来确定晶粒生长取向,以实际焊接过程的热循环作为模型的温度参考,采用局部抽象的网格之间的结合能的变化作为生长驱动力来建立模型。模拟结果表明,不同形核取向下的晶粒生长存在明显的竞争生长现象,而夹角为90°的晶粒生长竞争优势明显,使界面上生长的Fe_2A_5呈现"板条状"分布,导致这一现象的根本影响因素为Fe,Al原子在Fe_2A_5晶粒中的扩散机制不同,这与实际的试验结果非常符合。
The growth process of intermetallic compounds Fe_2Al_5 in the interface of aluminum-steel joints was simulated based on the stochastic model of Monte Carlo. Because of the special crystal structure of Fe_2Al_5,the angle between the c-axis oriented and nucleation-interface was selected randomly to determine growth orientation. Thermal cycling of actual welding process was used as the temperature of model,and the local abstract bonding energy changing was used as the driving force for crystal growth. The simulation results show that the crystal growth existed obvious competitive advantage with the different nucleation orientation of crystal,and then the competitive was most obvious when the angle between the c-axis oriented and nucleation-interface was 90°. Thus,Fe_2Al_5 intermetallic compounds layer was present and it was tongue-like distributed. The fundamental influencing factor of this phenomenon is the different diffusion mechanism of Fe and Al atoms in Fe_2Al_5 grains. The simulation results were in agreement with the experimental results.
The growth process of intermetallic compounds Fe_2Al_5 in the interface of aluminum-steel joints was simulated based on the stochastic model of Monte Carlo. Because of the special crystal structure of Fe_2Al_5,the angle between the c-axis oriented and nucleation-interface was selected randomly to determine growth orientation. Thermal cycling of actual welding process was used as the temperature of model,and the local abstract bonding energy changing was used as the driving force for crystal growth. The simulation results show that the crystal growth existed obvious competitive advantage with the different nucleation orientation of crystal,and then the competitive was most obvious when the angle between the c-axis oriented and nucleation-interface was 90°. Thus,Fe_2Al_5 intermetallic compounds layer was present and it was tongue-like distributed. The fundamental influencing factor of this phenomenon is the different diffusion mechanism of Fe and Al atoms in Fe_2Al_5 grains. The simulation results were in agreement with the experimental results.
引文
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[2]Lei Zhen,Yu Ning,You Aiqing,et al.Fusion-brazing joining between 5A02 aluminium alloy and Q235 steel by Nd:YAG laser-pulsed MIG hybrid welding[J].Transactions of the China Welding Institution,2008,29(6):21-24.
[3]黄健康,何翠翠,石玗,等.铝/钢异种金属焊接接头界面Al-Fe金属间化合物生成及热力学分析[J].吉林大学学报(工学版),2014,44(4):1037-1041
[4]Song J L,Lin S B,Yang C L,et al.Spreading behavior and microstructure characteristics of dissimilar metals TIGwelding-brazing of aluminum alloy to stainless steel[J].Materials Science and Engineering A,2009,509:31-40.
[5]Chen Z W,Gregory J T,Sharp R M.Intermetallic phases formed during hot dipping of low carbon steel in a Zn-5 pct Al melt at 450℃[J].Metallurgical and Materials Transactions A,1992,23(9):1073-5623.
[6]秦国梁,苏玉虎,王术军.铝合金/镀锌钢板脉冲MIG电弧熔-钎焊接头组织与性能[J].金属学报,2012,48(8):1018-1024.
[7]Lin S B,Song J L,Ma G C,et al.Dissimilar metals TIGwelding-brazing of aluminum alloy to galvanized steel[J].Frontiers of Materials Science,2009,3(1):78-83.
[8]Jácome L A,Weber S,Leitner A,et al.Influence of filler composition on the microstructure and mechanical properties of steel-aluminum joints produced by metal arc joining[J].Advanced Engineering Materials,2009,11(5):350-358.
[9]周惦武,彭艳,徐少华,等.添加Sn粉激光焊接钢/铝合金异种金属的显微组织与性能[J].金属学报,2013,49(8):959-968.
[10]林三宝,宋建岭,马广超,等.铝合金与不锈钢异种金属铝硅药芯焊丝TIG熔钎焊接头组织及性能[J].焊接学报,2009,30(7):9-12.
[11]韩日宏,董文超,陆善平,等.宏微观耦合模拟熔池不同区域中枝晶竞争生长过程[J].物理学报,2014,63(22):1-12.
[12]刘宁,黄健康,陈满骄,等.基于蒙特卡罗方法的铝/钢熔钎焊界面金属间化合物层生长分析[J].焊接学报,2016,37(2):55-58.
[13]石玗,温俊霞,黄健康,等.基于旁路耦合电弧的铝钢MIG熔钎焊研究[J].机械工程学报,2011,47(16):25-29.
[14]Shi Y,Shao L,Huang J K,et al.Effects of Si and Mg elements on microstructure of aluminum-steel joints produced by pulsed DE-GMA welding-brazing[J].Materials Science and Technology,2013,29(9):1118-1124.
[15]Burkhardt U,Grin Y,Ellner M,et al.Structure Refinement of the iron-aluminium phase with the approximate composition Fe2Al5[J].Acta Crystallographica,1994,B50(3),313-316
[16]王兴庆,隋永江.铁铝原子在金属间化合物形成中的扩散[J].上海大学学报(自然科学版),1998,4(6):661-666.
[17]Zhang G,Chen M J,Shi Y,et al.Analysis and modeling of the growth of intermetallic compounds in aluminum-steel joints[J].RSC Advances,2017,7(60):37797-37805.