Weldability of Thermomechanically Treated Steels Having a High Yield Point

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Abstract

The article concerns the issue of weldability of S700MC steel, treated thermo-mechanically, with high yield point. The weakest area of welded joints of this steel is a high - temperature coarse heat affected zone (HAZ) in which due to the nucleation effect of the dissolved phases, strengthening the matrix and their subsequent uncontrolled separation precipitation in the form of finely disperse and rapid decrease impact strength is observed. Performed arc welding tests here have shown that in order to ensure high quality of welded joints, it is necessary to limit the welding linear heat input. During the welding process of S700MC steel, it is not recommended to use pre heating before the welding process and heat treatment after welding, and the number of repairs should be kept to a minimum, because it leads to a reduction of strength and plastic properties in the HAZ area, as a result of aging processes, dissolution of strengthening phases in the matrix and their subsequent uncontrolled precipitation during cooling.

[1] K.S. Park, Y.H. Cho, Comparison of fatigue properties of weld-ed TMCP steels and normalized steel, Pohang University of Science and Technology, Pohang, Korea 2003.

[2] M. Opiela, Elaboration of thermomechanical treatment conditions of Ti-V and Ti-Nb-V microalloyed forging steels, Archives of Metallurgy and Materials 59, 3, 1181-1188 (2014).

[3] T. Sueyoshi, N. Ishikawa, The role of niobium in the retardation of the early stage of austenite recovery in hot-deformed steels. Materials Science and Engineering 250, 1, 2-7 (1998).

[4] N. Yurioka, TMPC steels and their welding. Welding in the World. 35, 6, (1995).

[5] Z. Zając, R. Langeborg, T. Siwecki, The role of nitrogen in microalloyed steels. Microalloying 95. Pitsburg 1995.

[6] T. Gladman, The physical metallurgy of mikroalloyed steels, The Institute of Materials, Cambridge University Press, Cambridge 1997.

[7] A. Grajcar, M. Rózanski, M. Kaminska, B. Grzegorczyk, Study on Non-Metallic Inclusions in Laser-Welded TRIP-Aided Nb-Microalloyed Steel, Archives of Metallurgy and Materials 59, 3, 1163-1169 (2014).

[8] J. Górka, Influence of welding thermal cycling on the join properties of S700MC steel treated using thermomechanical method, 15th International Conference on Experimental Me-chanics, 22-27 June, Porto, Portugal, 197-198 (2012).

[9] A. Lisiecki, J. Mańka, Welding S420MC steel sheets with high yield of high power laser diode, Bulletin of the Institute of Welding, Poland 3, 67-71 (2012).

[10] J. Hildebrand, F. Werner, Change of structural condition of welded joints between high-strength fine-grained and structural steels, Journal of civil engineering and management, 2, 87-95 (2004).

[11] K. Hakansson, Weld Metal Properties for Extra High Strength Steels, Report 2002 - August, Division of Welding, Department of Production Engineering, The Royal Institute of Technology.

[12] B. Meester, The weldability of modern structural TMCP steel. ISIJ International 37, 6, 537-551 (1997).

[13] K.S. Bang, W.Y. Kim, Estimation and prediction of HAZ soft-ening in thermomechanically controlled - rolled and accelerated - cooled steel. Welding Journal 81, 8, 174-179 (2002).

[14] A. Klimpel, A. Lisiecki et al., Numerical and experimental de-termination of weld pool shape during high-power diode laser welding. SPIE Proceedings Vol. 5229, Laser Technology VII: Applications of Lasers, 6, 247-250 October 2003.

[15] J. Górka, Analysis of simulated welding thermal cycles S700MC using a thermal imaging camera, Advanced Material Research ISI Proceedings 837, 375-380 (2014).

Archives of Metallurgy and Materials

The Journal of Institute of Metallurgy and Materials Science and Commitee on Metallurgy of Polish Academy of Sciences

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