Abstract
We present the x-ray techniques for characterizing laser heated metals for welding and cutting techniques. At present, with an undulator (70 keV) as well as bending magnet (30 keV) sources at SPring-8 as a probe source, CW 300 W Ytterbium fiber laser irradiates an Aluminum slab as a sample. Simultaneously the x-ray beam probes the sample for real time observation of a molten pool. We observe the convection indicated by the motion of tungsten based particles as a tracer in the molten pool. During the cooling phase, the molten metal is solidified with residual stresses which are affected by the heating and convection processes. In this experiment the time and space resolution are ∼milli-second and several tens of μm, respectively. On the other hand, microscopic short transient phenomena also play a significant role for the quality of a solidified material. For this purpose, we need high energy short pulse x-ray sources. We try to discuss on the capability and limitation of present x-ray sources and the prospect of an ultra high brightness x-ray source as a complementary source for full characterization of the laser heated and cooling processes of metals.
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Von Allmen, M., Blatter, A.: Laser-Beam Interactions with Materials, 2nd edn. Springer, Berlin (1995)
Daido, H., Nishiuchi, M., Pirozhkov, A.S.: Review of laser-driven ion sources and their applications. Rep. Prog. Phys. 75, 056401 (2012) (71 pages)
Daido, H.: Review of soft x-ray laser researches and developments. Rep. Prog. Phys. 65, 1513–1576 (2002)
Suckewer, S., Jaegle, P.: X-ray lasers: past, present, future. Laser Phys. Lett. 6, 411–436 (2009)
Sakino, Y., Sano, Y., Kim, Y.-C.: Application of laser peening without coating on steel welded joints. Int. J. Struct. Integr. 2, 332–344 (2011)
Sano, Y., et al.: Residual stress improvement in metal surface by underwater laser irradiation. Nucl. Instrum. Methods Phys. Res. B 121, 432–436 (1997)
Nishimura, A., et al.: Ablation of work hardening layers against stress corrosion cracking of stainless steel by repetitive femtosecond laser pulses. SPIE Proc. 5562, 673–677 (2004)
Nishimura, A., et al.: Development of inspection and repair technology for the micro cracks on heat exchange tubes. J. Jpn. Laser Process. Soc. 17, 207–212 (2010)
Azuma, H., et al.: Single-shot creation of nanometer-sized silicon tadpoles by ultrahigh-intensity laser. Jpn. J. Appl. Phys. 43, L1172–L1174 (2004)
Fujinaga, S., et al.: Direct observation of keyhole behaviour during pulse modulated high-power Nd:YAG laser irradiation. J. Phys. D: Appl. Phys. 33, 492–497 (2000)
Fujii, H., Sogabe, N., Nogi, K.: Convection in weld pool under microgravity and terrestrial conditions. Mater. Sci. Forum 512, 301–304 (2006)
Yamada, T., et al.: Phenomenological evaluation of laser-irradiated welding processes with a combined use of higher-accuracy experiments and computational science methodologies (3) In-situ observations of welded pool using an intense x-ray beam. In: Proc. the 12th International Symposium on Laser Precision Microfabrication (2011). Paper number # 11-055 Tu3-O-7, Att0091
Yamashita, S., et al.: Phenomenological evaluation of laser-irradiated welding processes with a combined use of higher-accuracy experiments and computational science methodologies (5) Numerical simulation of the welding processes with a multi-dimensional multi-physics analysis code SPLICE. In: Proc. International Conference on Nuclear Engineering, May 16–19, 2011 (2011). Paper number ICONE19-43939
Kou, S., Le, Y.: The effect of quenching on the solidification structure and transformation behaviour of stainless steel welds. Metall. Trans. A 13A, 1141–1152 (1982)
Muramatsu, T., et al.: Study on fundamental processes of laser welded metals observed with intense x-ray beams. In: Lee, J., Nam, C.H., Janulewicz, K.A. (eds.) X-Ray Lasers 2010. Springer Proceedings in Physics, vol. 136, pp. 245–255 (2011)
Zewail, A.H., Thomas, J.M.: 4D Electron Microscopy. Imperial College Press, London (2009), Chap. 1
Tanaka, H.: Next-generation light source gets boost from powerful new analysis technique. RIKEN home page, http://www.riken.go.jp/engn/r-world/research/results/2010/100922/image/100922.pdf (September 2010)
Rousse, A., Rischel, C., Gauthier, J.-C.: Colloquium: femtosecond x-ray crystallography. Rev. Mod. Phys. 73, 17–31 (2001)
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Daido, H. et al. (2014). Real-Time Observation of Laser Heated Metals with High Brightness Monochromatic X-Ray Techniques at Present and Their Future Prospects. In: Sebban, S., Gautier, J., Ros, D., Zeitoun, P. (eds) X-Ray Lasers 2012. Springer Proceedings in Physics, vol 147. Springer, Cham. https://doi.org/10.1007/978-3-319-00696-3_12
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DOI: https://doi.org/10.1007/978-3-319-00696-3_12
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-00695-6
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