冷却工艺对镀铝锌钢板锌花尺寸与组构的影响
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摘要
为提升厚规格镀铝锌板的表面质量、控制锌花尺寸、增强镀层观赏性,使用热浸镀模拟机组在厚规格钢板基体上制备了不同镀后冷却工艺的铝锌镀层(55.0Al-43.4Zn-1.6Si),使用扫描电子显微镜(SEM)及能谱仪(EDS)观察了镀层表面和截面的微观形貌及元素分布,探讨了镀后冷却工艺对铝锌镀层锌花尺寸、表面及截面形貌与结构的影响。结果表明:对于厚规格镀铝锌钢板,在600～380℃温度区间增大镀后冷却速率可降低锌花尺寸、增加枝晶取向的多样性,从而增强锌花立体感;同时可细化镀层组织、减小镀层表面二次枝晶间距,并降低金属间化合物层厚度。冷却过程中,600～520℃温度区间是镀层组织形核长大的关键阶段,因此在该温度段增大冷却速率可较为显著地减小锌花尺寸、细化镀层组织、提升镀层观赏性。
Several Al-Zn alloy coating layers with different cooling processes were prepared on thick steel sheet substrates by hot-dip simulation unit. Scanning electron microscope( SEM) and energy dispersive spectroscopy( EDS) were used to investigate the microstructure and element distribution of coating layers. Results showed that increasing the cooling rate at 600-380 ℃ could reduce the spangle size and enhance the sense of volume by increasing the orientation of dendrites. Moreover,increasing the cooling rate could decrease the secondary dendrite arm spacing by refining the microstructure and reduce the thickness of intermetallic compound layer. During the cooling procedure,600-520 ℃ was an important temperature interval for nucleation and growth. Therefore,enhance the cooling rate in 600-520 ℃ interval could prominently reduce spangle size,refine microstructure and improve the ornamental value.
Several Al-Zn alloy coating layers with different cooling processes were prepared on thick steel sheet substrates by hot-dip simulation unit. Scanning electron microscope( SEM) and energy dispersive spectroscopy( EDS) were used to investigate the microstructure and element distribution of coating layers. Results showed that increasing the cooling rate at 600-380 ℃ could reduce the spangle size and enhance the sense of volume by increasing the orientation of dendrites. Moreover,increasing the cooling rate could decrease the secondary dendrite arm spacing by refining the microstructure and reduce the thickness of intermetallic compound layer. During the cooling procedure,600-520 ℃ was an important temperature interval for nucleation and growth. Therefore,enhance the cooling rate in 600-520 ℃ interval could prominently reduce spangle size,refine microstructure and improve the ornamental value.
引文
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[3]LUO Q,LI Q,ZHANG J Y,et al.Microstructural evolution and oxidation behavior of hot-dip 55wt.%Al-Zn-Si coated steels[J].Journal of Alloys&Compounds,2015,646(1):843-851.
[4]吕家舜,李锋,文伟,等.铝锌硅热浸镀液的侵蚀性及镀层结构与性能研究[J].材料保护,2008,41(8):67-68.
[5]李建英,齐长发,梅淑文,等.热浸镀铝锌合金板的镀层结构及其性能:2009年全国冷轧板带生产技术交流会论文集[C].北京:中国金属协会,2009:179-183.
[6]徐伟,顾进荣.建筑用镀铝锌彩涂钢板的生产与应用[J].上海金属,2007,29(5):147-154.
[7]BAO J X.Nucleation and growth of 55%Al-Zn alloy on steel substrate[D].Wollongong:University of Wollongong,2005:65-67.
[8]Garcíavillarreal S,ARIZMENDIMORQUECHO A,Chávezvaldez A,et al.Effect of Cooling Rate on the Microstructure of AlZn Alloys with Addition of Silicon as Nanocomposite[J].Advances in Materials Science and Engineering,2013(1):1-9.
[9]SELVERIAN J H,NOTIS M R,MARDER A R.The microstructure of 55 w/o Al-Zn-Si(Galvalume)hot dip coatings[J].Journal of Materials Engineering,1987,9(2):133-140.
[10]郭太雄,刘常升,刘春富.热浸镀铝锌合金镀层钢板表面锌花形成的研究进展[J].材料保护,2016,49(2):50-54.
[11]赵云鹤,李谦,张捷宇,等.热浸镀55%Al-43.4%Zn-1.6%Si合金镀层表面晶花的研究:2008年全国冶金物理化学学术会议专辑[C].北京:中国稀土学报编辑部,2008:815-818.
[12]CHEN R Y,YUEN D.Microstructure and Crystallography of Zn-55Al-1.6Si Coating Spangle on Steel[J].Metallurgical&Materials Transactions A,2012,43(12):4 711-4 723.
[13]CHEN R Y,WILLIS D J.The behavior of silicon in the solidification of Zn-55Al-1.6Si coating on steel[J].Metallurgical&Materials Transactions A,2005,36(1):117-128.
[14]赵骏.钢板热浸镀55%Al-Zn合金镀层的组织及其形成过程[J].材料保护,2012,45(5):21-23.
[15]KALB J A,SPAEPEN F,WUTTIG M.Kinetics of crystal nucleation in undercooled droplets of Sb-and Te-based alloys used for phase change recording[J].Journal of Applied Physics,2005,98(5):48-53.
[16]KELLY T F,COHEN M,SANDE J B V.Rapid solidification of a droplet-processed stainless steel[J].Metallurgical Transactions A,1984,15(5):819-833.