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 MSA  Vol.7 No.5 , May 2016
The Effect of Microstructural and Geometric Inhomogeneities Induced by Laser for Forming Strain Analysis on Sheet Metal Formability
Abstract:

A commercially available laser marking system based on diode-pumped Nd:YVO4 laser was used for creating grid patterns for forming strain analysis of a dual-phase steel. The aim was to determine and analyze the influence of laser working parameters on the formability of sheet material by means of an in-depth characterization of this induced microstructural and geometric inhomogeneity. The electrochemical etching served as the reference method without the negative effect of generating inhomogeneity. The formability was evaluated using the cupping test according to Erichsen. While the quantification of geometric inhomogeneity was based on the determination of the notch factor, light microscopy and microhardness measurement were used for the evaluation of microstructural inhomogeneity. Furthermore, on the basis of the results an empirical regression model was established which described in terms of quantity the relationship between the examined factors such as laser power, pulse frequency and scanning speed as well as the command variable and the mark depth. The results showed that microstructural inhomogeneity in the used marking parameters due to their locally very limited formation did not have an appreciable influence on the mechanical properties. In contrast to this, the induced geometric inhomogeneity had a marked influence on the material formability.

Cite this paper: Guk, S. , Plotnikova, D. and Kawalla, R. (2016) The Effect of Microstructural and Geometric Inhomogeneities Induced by Laser for Forming Strain Analysis on Sheet Metal Formability. Materials Sciences and Applications, 7, 247-256. doi: 10.4236/msa.2016.75025.
References

[1]   Guk, S. (2006) The Relationship between Microstructure and Material Flow Processes in Sheet Metal Forming (German). PhD Thesis, TU Bergakademie Freiberg, Freiberg.

[2]   Thenikl, T., Guk, S. and Vallen, H. (2011) Interaction between Material Flow and Microstructure Evolution with Acoustic Emission Measurement. Proceedings of the International Conference MEFORM, Freiberg, 30 March-1 April 2011, 397-404.
http://www.gbv.de/dms/tib-ub-hannover/657990396.pdf

[3]   Guk, S., Smirnov, O. and Kawalla, R. (2006) Nonuniformity of the Deformation of Microstructural Components of Multiphase Steels in Evaluating the Limiting Formability of Flat-Rolled Products. Metallurgist, 5, 219-224.
http://link.springer.com/article/10.1007%2Fs11015-006-0067-9

[4]   Guk, S. (2016) Evaluation of Formability of Thin Sheet Metal from Mechanical Properties. Key Engineering Materials, 684, 80-85.
http://dx.doi.org/10.4028/www.scientific.net/kem.684.80

[5]   Ozturk, F., Dilmec, M., Turkoz, M., Ece, R. and Halkaci, H. (2009) Grid Marking and Measurement Methods for Sheet Metal Formability. Proceedings of the 5th International Conference and Exhibition on Design and Production of Machines and Dies/Molds, Ku?adas?, 18-21 June 2009, 41-49.

[6]   Bleck, W. (1999) Material Testing in the Study and Practice (German). Günter Mainz, Mainz.

[7]   Schatz, M. (2010) Advanced Applications of the Method of the Visio Plasticity in Sheet Metal Forming (German). PhD Thesis, TU Dresden, Dresden.

[8]   M?ntyj?rvi, K., Tulonen, J., Saarnivuo, T., Porter, J. and Karjalainen, J.A. (2008) Grid Patterns by Forming Strain Analysis. International Journal of Material Forming, 4, 249-252.
http://dx.doi.org/10.1007/s12289-008-0355-y

[9]   Technical Information for Laser Marking (German) (2006) TRUMPF Laser Marking Systems AG.
http://www.trumpf-laser.com/fileadmin/DAM/trumpf-laser.com/Technische_Infos/TI_Laserbeschriften.PDF

[10]   Laser Magazine of Trumpf (German)(2013) Laser-Community.
http://www.laser-community.com/de/metall-mit-laser-markieren-reicht-von-beschriften-ueber-gravieren-oder-abtragen-bis-zu-anlassen/

[11]   Leone, C., Genna, S., Caprino, G. and Iorio, I. (2010) AISI 304 Stainless Steel Marking by a Q-Switched Diode Pumped Nd:YAG Laser. Journal of Materials Processing Technology, 10, 1297-1303.
http://dx.doi.org/10.1016/j.jmatprotec.2010.03.018

[12]   Lallemand, G., Jacrot, G., Cicala, E. and Grevey, D.F. (2000) Grooving by Nd:YAG Laser Treatment. Journal of Materials Processing Technology, 1-3, 32-37.
http://dx.doi.org/10.1016/S0924-0136(99)00256-3

[13]   Cicala, E., Soveja, A., Sallamand, P., Grevey, D. and Jouvard, J.M. (2008) The Application of the Random Balance Method in Laser Machining of Metals. Journal of Materials Processing Technology, 1-3, 393-401.
http://dx.doi.org/10.1016/j.jmatprotec.2007.05.049

[14]   Hügel, H. and Graf, T. (2009) Lasers in Manufacturing. Laser Sources, Systems, Manufacturing Processes (German).

[15]   Abeln, T. (2002) Fundamentals and Process Engineering of Reactive Laser Precision Ablation of Steel (German). PhD Thesis, TU Stuttgart, Stuttgart.

[16]   Qi, J., Wang, K. and Zhu, Y. (2003) A Study on the Laser Marking Process of Stainless Steel. Journal of Materials Processing Technology, 1-3, 273-276.
http://dx.doi.org/10.1016/S0924-0136(03)00234-6

[17]   Krajewski, S. and Nowacki, J. (2014) Dual-Phase Steels Microstructure and Properties Consideration Based on Artificial Intelligence Techniques. Archives of Civil and Mechanical Engineering, 2, 278-286.
http://dx.doi.org/10.1016/j.acme.2013.10.002

[18]   B?nki, I. (1966) Comments on the Notch Factors Specified by Neuber for Thin Flat Panels (German). Mechanical Engineering, 3, 257-269.

[19]   Hofmann, M. (2011) Development and Validation of an Evaluation Model for Projects of the Static Design of Experiments (German). PhD Thesis, TU Berlin, Berlin.

[20]   Maslov, G. and Zibulevskiji, V. (2007) Optimization of Parameters and Operating Modes of Machines by Means of Design of Experiments (Russian). UMC “Triada”, Moscow.

 
 
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