Effect of flash processing on recrystallization behavior and mechanical performance of cold-rolled IF steel

Abstract

Flash processing (FP) has attracted considerable attention due to its high efficiency, economic advantages, and the extraordinary opportunity if offers to improve the mechanical properties of steel. In this study, we investigated the influences of FP on the recrystallization (REX) behavior and mechanical performance of cold-rolled IF steel. Using a thermomechanical simulator, we performed both single-stage FPs, at heating rates of 200°C/s and 500°C/s, and two-stage FP, with an initial preheating to 400°C at a rate of 5°C/s and then to peak temperatures at a rate of 200°C/s. In comparison to continuous annealing (CA), single-stage FP can effectively refine the recrystallized grain sizes and produce a similar or even sharper γ (ND (normal direction)//{111}) texture component. In particular, the heating rate of 500°C/s led to an increase in the yield strength of about 23.2% and a similar ductility. In contrast, the two-stage FP resulted in a higher REX temperature as well as a certain grain refinement due to the stored strain energy, i.e., the driving force of REX, which was largely consumed during preheating. Furthermore, both stronger {110}<110> and weaker γ texture components appeared in the two-stage FP and were believed to be responsible for the early necking and deterioration in ductility.

Keywords

flash processing / interstitial-free steel / recrystallization / mechanical properties / texture

References

[1] Ray RK, Jonas JJ, Hook RE. Cold rolling and annealing textures in low carbon and extra low carbon steels. Int. Metall. Rev., 1994, 39(4): 129.

[2] Samajdar I, Verlinden B, Kestens L, Van Houtte P. Physical parameters related to the developments of recrystallization textures in an ultra low carbon steel. Acta Mater., 1998, 47(1): 55.

[3] Hayakawa Y, Szpunar JA. Modeling of texture development during recrystallization of interstitial free steel. Acta Mater., 1997, 45(6): 2425.

[4] Qiu CY, Li L, Hao LL, Wang JG, Zhou X, Kang YL. Effect of continuous annealing temperature on microstructure and properties of ferritic rolled interstitial-free steel. Int. J. Miner. Metall. Mater., 2018, 25(5): 536.

[5] Shen YF, Xue WY, Wang YD, Liu YD, Zuo L. Tensile behaviors of IF steel with different cold-rolling reductions. Mater. Sci. Eng. A, 2008, 496(1–2): 383.

[6] Wang R, Bao YP, Yan ZJ, Li DZ, Kang Y. Comparison between the surface defects caused by Al₂O₃ and TiN inclusions in interstitial-free steel auto sheets. Int. J. Miner. Metall. Mater., 2019, 26(2): 178.

[7] Wang R, Bao YP, Li YH, Yan ZJ, Li DZ, Kang Y. Influence of metallurgical processing parameters on defects in cold-rolled steel sheet caused by inclusions. Int. J. Miner. Metall. Mater., 2019, 26(4): 440.

[8] Zhang L, Chen Z, Wang YH, Ma GQ, Huang TL, Wu GL, Jensen DJ. Fabricating interstitial-free steel with simultaneous high strength and good ductility with homogeneous layer and lamella structure. Scripta Mater., 2017, 141, 111.

[9] Yang MX, Pan Y, Yuan FP, Zhu YT, Wu XL. Back stress strengthening and strain hardening in gradient structure. Mater. Res. Lett., 2016, 4(3): 145.

[10] Saha R, Ray RK. Formation of nano- to ultrafine grains in a severely cold rolled interstitial free steel. Mater. Sci. Eng. A, 2007, 459(1–2): 223.

[11] Meng QG, Li J, Zheng HX. High-efficiency fast-heating annealing of a cold-rolled dual-phase steel. Mater. Des., 2014, 58, 194.

[12] Castro Cerda FM, Goulas C, Sabirov I, Kestens LAI, Petrov RH. The effect of the pre-heating stage on the microstructure and texture of a cold rolled FeCMnAlSi steel under conventional and ultrafast heating. Mater. Charact., 2017, 130, 188.

[13] Atkinson M. Bifurcation of thermal restoration processes in deformed iron and steel. Mater. Sci. Eng. A, 1999, 262(1–2): 33.

[14] Atkinson M. On the credibility of ultra rapid annealing. Mater. Sci. Eng. A, 2003, 354(1–2): 40.

[15] Muljono D, Ferry M, Dunne DP. Influence of heating rate on anisothermal recrystallization in low and ultra-low carbon steels. Mater. Sci. Eng. A, 2001, 303(1–2): 90.

[16] Ferry M, Muljono D, Dunne DP. Recrystallization kinetics of low and ultra low carbon steels during high-rate annealing. ISIJ Int., 2001, 41(9): 1053.

[17] Castro Cerda FM, Vercruysse F, Minh TN, Kestens L, Monsalve A, Petrov R. The effect of heating rate on the recrystallization behavior in cold rolled ultra low carbon steel. Steel Res. Int., 2017, 88(1): 1600351.

[18] Kestens L, Reis ACC, Kaluba W, Houbaert Y. Grain refinement and texture change in interstitial free steels after severe rolling and ultra-short annealing. Mater. Sci. Forum, 2004, 467–470, 287.

[19] Reis ACC, Bracke L, Petrov R, Kaluba WJ, Kestens L. Grain refinement and texture change in interstitial free steels after severe rolling and ultra-short annealing. ISIJ Int., 2003, 43(8): 1260.

[20] Chen QZ, Quadir MZ, Duggan BJ. Shear band formation in IF steel during cold rolling at medium reduction levels. Philos. Mag., 2006, 86(23): 3633.

[21] Hou ZY, Xu YB, Wu D. Recrystallization of ultra-low carbon steel sheet after ultra-rapid annealing. Acta Metall. Sin., 2012, 48(9): 1057.

[22] Li BL, Godfrey A, Meng QC, Liu Q, Hansen N. Microstructural evolution of IF-steel during cold rolling. Acta Mater., 2004, 52(4): 1069.

[23] Dziaszyk S, Payton EJ, Friedel F, Marx V, Eggeler G. On the characterization of recrystallized fraction using electron backscatter diffraction: A direct comparison to local hardness in an IF steel using nanoindentation. Mater. Sci. Eng. A, 2010, 527(29–30): 7854.

[24] Bocos JL, Novillo E, Petite MM, Iza-Mendia A, Gutierrez I. Aspects of orientation-dependent grain growth in extra-low carbon and interstitial-free steels during continuous annealing. Metall. Mater. Trans. A, 2003, 34(3): 827.

[25] Smith A, Luo HW, Hanlon DN, Sietsma J, Van Der Zwaag S. Recovery processes in the ferrite phase in C-Mn steel. ISIJ Int., 2004, 44(7): 1188.

[26] Luo HW, Sietsma J, Van Der Zwaag S. Effect of inhomogeneous deformation on the recrystallization kinetics of deformed metals. ISIJ Int., 2004, 44(11): 1931.

[27] Luo HW. Comments on “Austenite stability of ultrafine-grained transformation-induced plasticity steel with Mn partitioning” by S. Lee, S.J. Lee and B.C. De Cooman. Scripta Mater., 2012, 66(10): 829.

[28] Yang F, Luo HW, Pu EX, Zhang SL, Dong H. On the characteristics of Portevin-Le Chatelier bands in cold-rolled 7Mn steel showing transformation-induced plasticity. Int. J. Plast., 2018, 103, 188.

[29] Saha R, Ray RK. Texture and grain growth characteristics in a boron added interstitial free steel after severe cold rolling and annealing. Mater. Sci. Eng. A, 2010, 527(7–8): 1882.

[30] Saha R, Ray RK. Effect of severe cold rolling and annealing on the development of texture, microstructure and grain boundary character distribution in an interstitial-free (IF) steel. ISIJ Int., 2008, 48(7): 976.

[31] Shen K, Duggan BJ. Microbands and crystal orientation metastability in cold rolled interstitial-free steel. Acta Mater., 2007, 55(4): 1137.

[32] Kestens L, Jonas JJ. Modeling texture change during the static recrystallization of interstitial-free steels. Metall. Mater. Trans. A, 1996, 27(1): 155.

[33] R.L. Every and M. Hatherly, Oriented nucleation in low-carbon steels, Texture, Stress, Micro., 1(1974), art. No. 380237.

[34] Dillamore IL, Smith CJE, Watson TW. Oriented nucleation in the formation of annealing textures in iron. Met. Sci. J., 1967, 1(1): 49.

[35] Verbeken K, Kestens L, Jonas JJ. Microtextural study of orientation change during nucleation and growth in a cold rolled ULC steel. Scripta Mater., 2003, 48(10): 1457.

[36] Vanderschueren D, Yoshinaga N, Koyama K. Recrystallisation of Ti IF steel investigated with electron backscattering pattern (EBSP). ISIJ Int., 1996, 36(8): 1046.

[37] Hutchinson WB. Development of textures in recrystallization. Met. Sci., 1974, 8(1): 185.

[38] Humphreys FJ, Hatherly M. Recrystallization and Related Annealing Phenomena, 2004, 2nd ed., Oxford, Elsevier Science Ltd., 25.

[39] Xie CI, Nakamachi E, Dong XH. Study of texture effect on strain localization on bcc steel sheets. Acta Mech. Solida Sin., 2000, 13(2): 95.

[40] Xie CL, Nakamachi E. The effect of crystallographic textures on the formability of high-strength steel sheets. J. Mater. Process. Technol., 2002, 122(1): 104.