吉林大学学报(工学版) ›› 2021, Vol. 51 ›› Issue (6): 2021-2030.doi: 10.13229/j.cnki.jdxbgxb20200653

• 材料科学与工程 • 上一篇    

SCR生产线结晶腔铜液凝固行为及质量控制

姬会爽1,2(),彭艳1(),刘洋1,杨彦博1,高鲲1,尔立民2   

  1. 1.燕山大学 国家冷轧板带装备及工艺工程技术研究中心,河北 秦皇岛 066004
    2.江苏亨通精工金属材料有限公司,江苏 苏州 215232
  • 收稿日期:2020-08-27 出版日期:2021-11-01 发布日期:2021-11-15
  • 通讯作者: 彭艳 E-mail:tureleo@163.com;pengyan@ysu.edu.cn
  • 作者简介:姬会爽(1982-),男,博士研究生.研究方向:铜基材料连铸连轧,深加工产品工艺优化及质量改进. E-mail:tureleo@163.com
  • 基金资助:
    国家重点研发计划项目(2017YFB0306402);河北省自然科学基金重点项目(E2017203161)

Solidification behavior and quality control of molten copper in SCR production line

Hui-shuang JI1,2(),Yan PENG1(),Yang LIU1,Yan-bo YANG1,Kun GAO1,Li-min ER2   

  1. 1.National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,China
    2.Jiangsu Hengtong Precision Metal Material Co. ,Ltd. ,Suzhou 215232,China
  • Received:2020-08-27 Online:2021-11-01 Published:2021-11-15
  • Contact: Yan PENG E-mail:tureleo@163.com;pengyan@ysu.edu.cn

摘要:

结合现场生产实践经验,研究了SCR连铸连轧生产线连铸系统结晶腔内铜液凝固行为及其影响因素,探讨了浇铸温度、拉坯速度、乙炔流量、冷却水控制等各铸造工艺参数对铜液凝固行为的影响机理(铜液温度场流场及凝固结晶行为),并分析了铸坯组织缺陷形成原因(浇铸温度、拉坯速度、冷却水流量等波动大),提出了铸坯质量工艺优化方法。本文研究成果对解析SCR生产线以提高铜杆品质具有借鉴意义。

关键词: 材料合成与加工工艺, 连铸连轧, 铜铸坯, 凝固行为, 工艺优化

Abstract:

The stability of temperature field control directly affects the stability of production and quality. Based on the practical production experience, the solidification behavior of molten copper in the continuous casting system of SCR continuous casting and rolling production line and its influencing factors were studied. The influence mechanisms (temperature field, flow field, and solidification crystallization behavior of copper liquid)of casting process parameters such as casting temperature, casting speed, acetylene flow rate and cooling water control were discussed. The formation reasons (casting temperature, casting speed and cooling water flow rate fluctuate greatly) of microstructure defects were analyzed, and the optimization method of slab quality was proposed. The research work has important reference significance for analyzing SCR production line to improve the quality of copper rod.

Key words: material synthesis and processing technology, continuous casting and rolling, copper billet, solidification behavior, process optimization

中图分类号: 

  • TF811

图1

五轮式浇铸机结构示意图"

图2

连铸工艺参数决定铜铸坯组织结构"

图3

结晶腔铜液凝固行为变化"

图4

连铸铸坯组织形貌"

图5

不同浇铸温度下的金相组织图"

图6

不同浇铸速度下的金相组织图"

表1

SCR3000铸机水分布"

结晶轮侧冷却水钢带侧冷却水
流量/(L·min-1

喷嘴

个数

流量/(L·min-1

喷嘴

个数

冷却1区8.327~29.523157.57~22.7114
冷却2区37.851425.73814
冷却3区38.85728.76610

图7

结晶腔铜液流动特征模拟"

图8

结晶区温度场分布模拟"

表2

铜液凝固基本模型"

计算目标模型模型表达式相关参数
温度场二维热传导方程??xλ?T?x+??yλ?T?y+q*=cρ?T?tρ为材料密度;c为材料比热;q*为微体内热源产生的热量。
形核密度连续形核模型dndΔT=nmax2πΔTσexp-12ΔT-ΔTˉΔTσ2ΔTσ为合金标准方差过冷度;ΔTˉ为最大形核过冷度;nmax为最大形核数。
形核概率经验公式Pn=δn?VmPn为形核概率;δn为形核密度;Vm为每个网格单元的体积。
形核判定形核判定方程Ax,y=0,Pnt+Δtn1,Pnt+Δt>nAx,y为元胞的状态;n为0到1的任意值。
柱状晶生长KGT模型ν=αΔT2+βΔT3αβ为回归系数,与合金自身成分有关。
等轴晶生长溶质扩散模型fs=fg?fi=fgΩPeg,Peg=RviDlgPeg=1+32Peg+1Peg2+14Peg3fsfgfi分别为已凝固初生枝晶、液相和球状晶粒中的固相分数;Ω为过饱和度;gPeg为Peclet数的函数。
生长概率生长长度计算lt+δt=tt+δtVΔTtdtcosθ+sinθδt为微观时间步长;V为生长速度;ΔTtt时刻过冷度;θ为对象元胞晶体学取向与该元胞与邻居元胞连线的夹角。
生长判定判定方程Ax,y=0,Δfsδt<11,Δfsδt=1Δfsδt为在一个微观时间步长δt内固相率的变化。
微观时间步长时间步长方程Δt=Δx2ρc6?λλ为合金导热率;Δx为微观空间距离。
宏观时间步长时间步长方程δt=mindxVmaxδt,dx2DL1number3Vmaxδt为所有生长状态元胞生长速度的最大值。

表3

连铸系统不同工艺参数"

工况铸机速度/(t·h-1浇包温度/℃水温/℃铸轮侧温度/℃NIP/(L·min-1冷却水流量/(L·min-1
钢带1钢带2钢带3铸轮内1铸轮内2铸轮内3机器侧操作侧
a24.5113628945115332630925350950698100
b2511292099581542952982514984909693
c24.511182577551522923022505064868784
d2411162979501512983052575054758583
e24.511162483531542813202605024808399
f24.511242883511512993062585074798385

图9

不同工艺参数下的铜铸坯组织形貌"

图10

SCR连铸结晶腔结晶组织质量控制"

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