Head curvature of pure titanium sheet influenced by process parameters and controlling in hot rolling process

Abstract

We investigated the influences of process parameters on the head curvature of pure titanium sheet in hot rolling process and proposed the controlling means. First, the thermal simulation experiments for pure titanium TA1 were carried out to investigate the hot deformation behaviors of pure titanium in the temperature range of 700-800 °C with strain rate range of 1-20 S^-1, and the processing map was established to determine optimized deformation parameters. Then, the finite element model has been constructed and used to analyze the effect of process parameters on the direction and severity of head curvature of pure titanium sheet. The process parameters considered in the present study include workpiece temperature, work roll diameter, pass reduction, oxide scale thickness of workpiece surface, and interface friction coefficient. The simulation results show that the workpiece temperature and the interface friction coefficient are the two main factors. The proposed controlling means was carried out on a hot rolling production line and solved the head curvature problem effectively. The rolling practices indicate that the rolling yield is improved greatly.

Keywords

head curvature / hot rolling / process parameter / thermal simulation / pure titanium sheet

References

[1] Li ML, Shu Y, Feng YJ. Application Status on Domestic Titanium and Titanium Alloys Plate and Strip[J]. Titanium Industry Progress, 2011, 28(6): 14-17.

[2] Banerjee D, Williams JC. Perspectives on Titanium Science and Technology[J]. Acta Materialia, 2013, 61(3): 844-879.

[3] Kunal K, Ramachandran R, Norman MW. Advances in Gamma Titanium Aluminides and Their Manufacturing Techniques[J]. Progress in Aerospace Sciences, 2012, 55(5): 1-16.

[4] Lee SH, Lee DN. Analysis of Deformation Textures of Asymmetrically Rolled Steel Sheets[J]. International Journal of Mechanical Sciences, 2001, 43(9): 1997-2015.

[5] Sun JQ, Zhang HB, Yu QC. Reason for Curling at Front End of Hot Rolled Steel Strip[J]. Journal of Iron and Steel Research, 2006, 18(7): 30-34.

[6] Wang FL, Liu Y, Li JH, et al. Simulating Analysis of the Bending-Head of Slab for Hot Rough Rolling[J]. Iron and Steel, 2010, 45(4): 46-49.

[7] Denis A, Tobias M, Jens A, et al. A Dimensional Analysis of Frontend Bending in Plate Rolling Applications[J]. Journal of Materials Processing Technology, 2012, 212(6): 1387-1398.

[8] Wang JZ. Actuality of the Head Warping of Plate and Strip[J]. J. Xi'an Univ. of Arch. & Tech., 2011, 43(2): 294-300.

[9] Philipp M, Fischer FD, Fischer C, et al. Front End Bending in Plate Rolling Influenced by Circumferential Speed Mismatch and Geometry[J]. Journal of Materials Processing Technology, 2007, 184(1–3): 224-232.

[10] Hu YS, Cheng XR, Song YH, et al. Discussion on Front End Bending during Plate Rolling[J]. Iron and Steel, 2003, 39(6): 28-31.

[11] Yang CC, Qi KM, Qiu CL. Front Bending Rule Research on Hot Strip Steel during Rolling with Different Diameter Rolls[J]. Physics Examination and Testing, 2008, 26(5): 6-8.

[12] Salimi M, Sassani F. Modified Slab Analysis of Asymmetrical Plate Rolling[J]. International Journal of Mechanical Science, 2002, 44(9): 1999-2023.

[13] Gudur PP, Salunkhe MA, Dixit US. A Theoretical Study on the Application of Symmetric Rolling for the Estimation of Friction[J]. International Journal of Mechanical Sciences, 2008, 50(2): 315-327.

[14] Knight CW, Hardy SJ, Brown KJ, et al. Investigation into the Influence if Asymmetric Factors and Rolling Parameters on Strip Curvature during Hot Rolling[J]. Journal of Materials Processing Technology, 2003, 134(2): 180-189.

[15] Li XT, Du FS, Zhang XF, et al. Nonlinear FEM Study of Head End Curling in Plate Rolling[J]. Journal of Iron and Steel Research, 2005, 17(5): 43-47.

[16] Sajadifar SV, Yapici GG. Workability Characteristics and Mechanical Behavior Modeling of Severely Deformed Pure Titanium at High Temperatures[J]. Materials and Design, 2014, 53(1): 749-757.

[17] Peng J, Zhou CY, Dai Q. Strain Rate Sensitivity of Commercially Pure Titanium TA2 at Room Temperature and Revising of Hollomon Empirical Formula[J]. Rare Metal Materials and Engineering, 2013, 42(3): 483-487.

[18] Panda S, Sahooa SK, Dasha A, et al. Orientation Dependent Mechanical Properties of Commercially Pure(cp) Titanium[J]. Materials Characterization, 2014, 98: 93-101.

[19] Ji YQ, Qu SD, Han WX. Hot Deformation and Processing Map of GH3535 Superalloy[J]. Transactions of Nonferrous Metals Society of China, 2015, 25(1): 88-94.

[20] Guptaa RK, Narayana MSVS, Panta B, et al. Hot Workability of Titanium aluminide: Development of Processing Map and Constitutive Equations[J]. Materials Science and Engineering A, 2012, 551(15): 169-186.