In Situ Observation of Weld Solidification and Phase Transformation Process Using Synchrotron Radiation

Abstract:

In order to understand the microstructure changes during welding processes , kinetic information about the phase transformation is essential. In our research group, in-situ observation systems consisting of undulator beam and imaging plate and two dimensional pixel detector have recently been used. These make it possible that phase transformation can be identified in real-time under the condition of directional-oriented solidification . In the present work, a combination of analyzing method: the in-situ observation system by X-ray diffraction technique using intense synchrotron radiation, and morphological observation by high-temperature laser scanning confocal microscopy is suggested to analyze the phase transformation during the welding process. Using the results acquired by these analysis methods, phase evolution of hypereutectoid carbon steel, during fusion welding was analyzed. The primary phase was directly identified as an austenite phase. Precipitation of pearlite phase was observed followed by the martensitic transformation.

• Periodical: Materials Science Forum (Volumes 539-543)
• Pages: 3820-3825
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.539-543.3820
• Online since: March 2007
• Authors: Yuichi Komizo, Hidenori Terasaki, Mitsuharu Yonemura, Takahiro Osuki
• Keywords: Phase Transformation, Solidification, Synchrotron Radiation (XRD), Welding, X-Ray Diffraction (XRD)

References

[1] S. Kou and Y. Le: Metall. Mater. Trans. A 13A 1141-1152(1982).

[2] F. Matsuda , H. Nakagawa and J.B. Lee: Trans. of JWRI. 16 (2) 343-349 (1987).

[3] H. Inoue , T. Koseki, S. Ohkita and M. Fuji: Q. J. Jpn. Weld. Soc. 15 (1) 77-87 (1997).

[4] H. Inoue , T. Koseki, S. Ohkita and M. Fuji: Q. J. Jpn. Weld. Soc. 15 (1) 88-99 (1997).

[5] Y. Komizo, M. Yonemura, T. Osuki and H. Terasaki : Trans. JWRI, 33(2) 143-146 (2004).

[6] J. W. Elmer , J. Wong, M. Froba, P.A. Waideand and E.M. Larson: Metall. Mater. Trans. A 27A 775-783(1996).

[7] J. W. Elmer , J. Wong and T. Ressler: Metall. Mater. Trans. A 32A 1175-1187(2001).

[8] T. A. Palmerr , J.W. Elmer and J. Wong: Sci. and Tech. Weld. And Join. 7(3) 159-171(2002).

[9] J. W. Elmer , J. Wong and T. Ressler: Scripta Mater. 43 751-757(2000).

[10] S. S. Babu , J.W. Elmer, J.M. Vitek and S.A. David: Acta Mater. 50 4763-4781(2002).

[11] M. Yonemura, T. Osuki, H. Terasaki, Y. Komizo, M. Sato and A. Kitano: to be published in Materials Transactions, JIM. Vol. 47(2006), No. 2.

[12] E.F. Eikenberry , C.H. Bronnimann, G. Hulsen, H. Toyokawa, R. Horisberger, B. Schmitt, C. Schulze and T. Tomizaki: Nucl. Instr. and Meth. A501 (2003) 260-266.

[13] Y. KOMIZO , H. TERASAKI , M. YONEMURA and T. OSUKI In-situ observation of phase evolution in fusion welding of hypereutectoid carbon steel To be published in Quarterly Journal of Japan Welding Society, Vol. 24(2006), No. 1.

DOI: 10.2207/qjjws.24.57

[14] H. Terasaki, Y. Komizo, M. Yonemura and T. Osuki : Time-resolved in-situ analysis of phase evolution for the directional solidification of carbon steel weld metal To be published in Met. Trans. A.

DOI: 10.1007/s11661-006-1077-8