Effects of the microstructure of twin roll cast and hot rolled plates on the surface quality of presensitized plates

Abstract

The effect of the microstructure of plates fabricated both in the traditional process, involving casting, hot rolling and cold rolling (HR), and in the novel twin roll casting + cold rolling (TRC) process on the surface quality of presensitized (PS) plates was analyzed by optical microscopy (OM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDXS). The formation of pores on the surface of the electrolyzed HR plate could be attributed to the presence of approximately 1-μm-sized large Al-Fe precipitates in the HR plate compared to the smaller precipitates in the TRC plate. Moreover, residual graphite lubricants used during the TRC process were entrapped on the surface of the TRC plate during the subsequent rolling process. The entrapped pollutants tended to further deteriorate the formation of pores on the surface of the TRC plate, and no residual carbon was detected on the surface of the HR plate. Furthermore, the surface quality of the TRC plate can be improved by surface cleaning before the cold rolling process, which could dramatically lower the residual graphite on the surface.

Keywords

aluminum plates / microstructure / presensitizing / surface quality

References

[1] Fang Y, Wang ZM, Yang QX, Zhang YK, Liu LG, Hu HY, Zhang Y. Numerical simulation of the temperature fields of stainless steel with different roller parameters during twin-roll strip casting. Int. J. Miner. Metall. Mater., 2009, 16(3): 304.

[2] Wang B, Zhang JY, Zhang Y, He YD, Fan JF, Fang Y, An SL. Numerical and physical simulation of a twin-roll strip caster. J. Univ. Sci. Technol. Beijing, 2006, 13(5): 393.

[3] Haga T, Tkahashi K, Ikawaand M, Watari H. Twin roll casting of aluminum alloy strips. J. Mater. Process. Technol., 2004, 153–154, 42.

[4] Kunichika K, Ohba H, Nishioka A, Matsumoto H, Akiyama K. Method for Development Processing of Presensitized Plates, 1989

[5] Peterson JOH. Presensitized Printing Plate with in-situ, Laser Imageable Mask, 1979

[6] Ohba H, Oda K, Sakaki H, Shirai A, Ohashi A. Supports for Lithographic Printing Plates and Process for Producing the Same, 1984

[7] Endo T, Masuda Y, Nishino A, Uesugi A, Hotta H. Support for Lithographic Printing Plate and Presensitized Plate, 2004

[8] Kosuge H. Commercial purity aluminum. J. Jpn. Inst. Light Met., 1988, 38, 292.

[9] An MZ, Zhao LC, Tu ZM. Graining technology by electrolytic etching on the surface of aluminum alloys. Mater. Chem. Phys., 2003, 77(1): 170.

[10] Bendersky LA, McAlister AJ, Biancaniello FS. Phase transformation during annealing of rapidly solidified Al-rich Al-Fe-Si alloys. Metall. Trans. A, 1988, 19(12): 2893.

[11] Zhu YZ, Huang RY, Zhu Z, Xiang ZD. Comparative study on effects of microstructures of hot rolled and twin roll casting 1235 aluminium alloy on surface quality of aluminium foils produced. Mater. Sci. Technol., 2011, 27(4): 761.

[12] Ma L, Wang XK, Sun YF, Chen K, Li M. Investigation on the microstructure of different sheets produced in Bahrain, and China for hot roll aluminium foils. Foundry Technol., 2005, 26(10): 971

[13] Ono S, Masuko N. Evaluation of pore diameter of anodic porous films formed on aluminum. Surf. Coat. Technol., 2003, 169–170, 139.

[14] Lee PD, Chirazi A, See D. Modeling microporosity in aluminum-silicon alloys: a review. J. Light Met., 2001, 1(1): 15.

[15] J. Appl. Phys., 2010, 108(7)

[16] Xu J, Lv ZM, Xu JW. Model and algorithm of integrative batch planning based on parallel strategy for steelmaking-continuous casting-hot rolling. Control Decis., 2006, 21(9): 979