Effects of Grain Size on the Groove Depths in Microlaser Cutting of Austenitic Stainless Steel SUS304
Komatsuseiki Kosakusho Co., Ltd.
942-2 Shiga, Suwa city, Nagano, Japan
Over the last decade, developments of fine grained materials and investigations of the effects of grain size on mechanical processing at the micro scale have been reported. There are several papers and reports on the function improvements achieved due to enhanced edge quality. However, it is difficult to identify the studies about the effects of grain size on the processed surface in laser processing because ultrafine grain materials were not supplied in the market. In this study, the effect of grain size on the depth of groove by laser processing is investigated. Microgrooves are produced using a picosecond laser machine. The grooves are observed with a non-contact 3D measuring machine, and the depth and surface conditions are determined. There are obvious differences on the depth between the different grain sizes. Specimens were cut to allow the observation of the phase transformation of grains in the cross section using scanning electron microscope (SEM) and electron back scatter diffraction (EBSD). There are several obstacles when producing deeper grooves. As a result, smaller grained stainless steels are suitable for producing microparts by microlaser cutting.
-  F. Vollertsen, D. Biermann, H. N. Hansen, I. S. Jawahir, and K. Kuzman, “Size effects in manufacturing of metallic components,” CIRP Annals-Manufacturing Technology, Vol.58, No.2, pp. 566-587, 2009.
-  S. H. Wang (Ed.), “Nanostructured metals and alloys,” Woodhead Publishing Limited, pp. 747-786, 2011.
-  Y. Saotome, “State of the Art in Micro Forming and View in the Future,” Journal of the Japan Society for Technology of Plasticity, Vol.49, No.570, pp. 614-618, 2008.
-  N. Tsuji, Y. Saito, H. Utsunomiya, and S. Tanigawa, “Ultra-fine grained bulk steel produced by accumulative roll-bonding (ARB) process,” Scripta Materialia, Vol.40, No.7, pp. 795-800, 1999.
-  A. D.Schino, M. Barteri, and J. M. Kenny, “Development of ultra fine grain structure by martensitic reversion in stainless steel,” Journal of materials science letters, Vol.21, No.9, pp. 751-753, 2002.
-  I. Salvatori, T.Inoue, and K. Nagai, “Ultrafine grain structure through dynamic recrystallization for Type 304 stainless steel,” ISIJ int., Vol.42, No.7, pp. 744-750, 2002.
-  S. Torizuka, E. Muramatsu, S. N. Murty, and K. Nagai, “Microstructure evolution and strength-reduction in area balance of ultrafine-grained steels processed by warm caliber rolling,” Scripta materialia, Vol.55, No.8, pp. 751-754. 2006.
-  A. Belyakov, T. Sakai, and H. Miura, “Fine-Grained Structure Formation in Austenitic Stainless Steel under Multiple Deformation at 0.5T m,” Materials Trans., Vol.41, No.4, pp. 476-484. 2000.
-  S. Takagi and M. Tomita, “Ultra-fine grain steel,” Kogyo Zairyo (Engineering Materials), Vol.54, No.1, pp. 30-31, 2006.
-  T. Komatsu, H. Kobayashi, S. Torizuka, and S. Nagayama, “Micro Hole Piercing for Ultra Fine Grained Steel,” Materials Science Forum, Vol.783, pp. 2653-2658, 2014.
-  T. Komatsu, M. Komatsu, H. Yanagisawa, T. Uehara, T. Yanagisawa, and S. Manabe, “Development of Advanced Stamping Process of Orifice Plate for Electric Controlled Fuel Injector – Contribution of Small Parts to Environment–,” Journal of the Japan Society for Technology of Plasticity, Vol.52, No.611, pp. 1281-1285, 2011.
-  M. Katoh, T. Shiratori, Y. Suzuki, S. Nakano, and T. Komatsu, “Deformation of Material in Punching of Slanted Fine Hole in SUS304 Sheets with Fine-grained Microstructure,” Journal of the Japan Society for Technology of Plasticity, Vol.55, No.638, pp. 223-227. 2014.
-  S. Torizuka, E. Muramatsu, T. Komatsu, and S. Nagayama, “Characterization of Sheared Edge of Ultrafine-Grained Steel,” Journal of the Japan Society for Technology of Plasticity, Vol.55, No.642, pp. 626-632, 2014.
-  T. Komatsu, T. Matsumura, and S. Torizuka, “Effect of grain size in stainless steel on cutting performance in micro-scale cutting,” Int. Journal of Automation Technology, Vol.5, No.3, pp. 334-341. 2011.
-  T. Komatsu, T. Yoshino, T. Matsumura, and S. Torizuka, “Effect of crystal grain size in stainless steel on cutting process in micromilling,” Proc. CIRP, Vol.1, pp. 150-155, 2012.
-  T. Komatsu, T. Yoshino, S. Torizuka, and T. Matsumura, “Effect on stainless steel surfaces form micro cutting in different grain size,” Int. Conf. on Micro Manufacturing, No.116, 2014.
-  F. Siegel, U. Klug, R. Kling, and A. Ostendorf, “Extensive micro-structuring of metals using picosecond pulses – Ablation behavior and industrial relevance,” Journal of Laser Micro/Nanoengineering, Vol.4, No.2, pp. 104-110, 2009.
-  M. Fujita and M. Hashida, “Femtosecond-Laser Processing,” Journal of Plasma Fusion, Vol.81, pp. 195-201, 2005.
-  T. J.Wieting and J. L. DeRosa, “Effects of surface condition on the infrared absorptivity of 304 stainless steel,” Journal of Applied Physics, Vol.50, No.2, pp. 1071-1078, 1979.
-  Z. Guosheng, P. M. Fauchet, and A. E. Siegman, “Growth of spontaneous periodic surface structures on solids during laser illumination,” Physical Review B, Vol.26, No.10, pp. 5366, 1982.
-  P. T.Mannion, J. Magee, E. Coyne, G. M. O’Connor, and T. J. Glynn, “The effect of damage accumulation behavior on ablation thresholds and damage morphology in ultrafast laser micro-machining of common metals in air,” Applied surface science, Vol.233, No.1, pp. 275-287, 2004.
-  C. S.Lee, N. Koumvakalis, and M. Bass, “Spot size dependence of laser induced damage to diamond turned Cu mirrors,” Applied Physics Letters, Vol.41, No.7, pp. 625-627, 1982.
This article is published under a Creative Commons Attribution-NoDerivatives 4.0 Internationa License.