摘要
针对焊接熔渣-金属冶金反应远离平衡的特性,从非平衡态热力学及液-液两相交互作用耦合的角度建立了液态熔渣组成中S iO2与熔敷金属间的化学反应热动力学模型。对建立的模型通过试验测试,并借助于M atlab工具软件进行了非线性数值求解。定量计算结果表明,焊接过程各区域的冶金反应方向及限度存在明显的不同,熔滴反应区正向氧化反应偏离平衡态的距离远大于熔池反应区逆向脱氧反应偏离平衡的距离。同时反应所处的温度及熔渣中S iO2含量都在一定程度上影响反应的方向及限度,从而对焊缝金属的增氧产生重要影响。
To counter its characteristics of far from equilibrium, the metallurgical reaction occurred at slag/metal interface for SiO2 in molten slag with deposited metal had been modeled in view of coupling nonequilibrium static thermodynamics with interacting principle of liquid-liquid phases. According to the established model, nonlinear numerical simulation was carried out with matlab software. The result of quantitative calculating shows that there is obvious distinction in direction and limitation for different welding zones. The distance of drifting off equilibrium state for straight oxidizing direction in droplet stage is far more than that of inverse reducing direction in welding pool zone. Meanwhile, factors such as temperature, SiO2 content exert certain influence on direction and limitation of chemical reaction, which produces great impact on oxygen gaining for weld metal.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2005年第10期43-46,共4页
Transactions of The China Welding Institution
基金
江苏省高校自然科学基金资助项目(00KJD430004)
关键词
冶金反应
熔滴反应区
熔池反应区
反应方向
Chemical reactions
Computer applications
Interfaces (materials)
Metallurgy
Silica
Slags
Thermodynamics
