Microstructural Characterization and Mechanical Properties of Electron Beam Welded Joint of High Strength Steel Grade S690QL

Open access


In the paper the results of metallographic examination and mechanical properties of electron beam welded joint of quenched and tempered steel grade S690QL are presented. Metallographic examination revealed that the concentrated electron beam significantly affect the changes of microstructure in the steel. Parent material as a delivered condition (quenched and tempered) had a bainitic-martensitic microstructure at hardness about 290 HV0.5. After welding, the microstructure of heat affected zone is composed mainly of martensite (in the vicinity of the fusion line) of hardness 420 HV0.5. It should be noted, however, that the microstructure of steel in the heat affected zone varies with the distance from the fusion line. The observed microstructural changes were in accordance with the CCT-S transformation diagram for the examined steel.

[1] M.St. Węglowski, Modern toughened steels - their properties and advantages, Biuletyn Instytutu Spawalnictwa 56(4), 32-38, 41 (2012).

[2] M.St. Węglowski, M. Zeman, Prevention of cold cracking in ultra-high strength steel Weldox 1300, Archives of Civil and Mechanical Engineering 14(3), 417-424 (2014).

[3] A.A. Grajcar, Thermodynamic analysis of precipitation processes in Nb-Ti-microalloyed Si-Al TRIP steel, Journal of Thermal Analysis and Calorimetry 118, 1011-1020 (2014).

[4] A. Grajcar, M. Rozanski, S. Stano, et al., Microstructure characterization of laser-welded Nb-microalloyed silicon-aluminum TRIP steel, Journal of Materials Engineering and Performance 23, 3400-3406 (2014).

[5] M.St. Węglowski, K. Krasnowski, K. Kwieciński, R. Jachym, The characteristics of Nd:YAG laser welded joints of dual phase steel, Archives of Civil and Mechanical Engineering 9, 85-97 (2009).

[6] A. Grajcar, M. Rozanski, S. Stano, et al., Effect of heat input on microstructure and hardness distribution of laser welded Si-Al TRIP-type steel, Advances in Materials Science and Engineering, Article Number: 658947 (2014).

[7] T. Wegrzyn, S.Wieszala, Significant alloy elements in welded steel structures of car body, Archives of Metallurgy and Materials 57, 45-52 (2012).

[8] A. Grajcar, W. Zalecki, et al., Dilatometric study of phase transformations in advanced high-strength bainitic steel, Journal of Thermal Analysis and Calorimetry 118, 739-748 (2014).

[9] A. Grajcar, Microstructure evolution of advanced high-strength TRIP-aided bainitic steel, Materiali in Tehnologije 49, 715-720 (2015).

[10] M.St. Węglowski, S. Stano, G. Michta, W. Osuch, Structural characterization of Nd:YAG laser welded joint of dual phase steel, Archives of Metallurgy and Materials 55, 211-220 (2010).

[11] N. Enzinger, H. Cerjak, Characterisation of cracks in high strength steel weldments, Welding in the World 51(11-12), 29-33 (2007).

[12] W. Vanovsek, C. Bernhard, M. Fiedler, R. Schnitzer, Effect of titanium on the solidification and postsolidification microstructure of high-strength steel welds. Weld World 57, 665-674 (2013).

[13] M. Gaspar, A. Balogh, GMAW experiments for advanced (Q+T) high strength steels. Production Processes and Systems 6(1), 9-24 (2013).

[14] M.St. Węglowski, M. Zeman, M. Łomozik, Weldability of toughened steels with the yield strength over 1000 MPa, Biuletyn Instytutu Spawalnictwa 56, 202-206 (2012).

[15] M.St. Węglowski, M. Zeman and M. Łomozik, Physical Simulation of Weldability of Weldox 1300 Steel, Materials Science Forum 762, 551-551 (2013).

[16] M. Opiela, Hydrogen embrittlement of welded joints for the heat- -treatable XABO 960 steel heavy plates, Journal of Achievements in Materials and Manufacturing Engineering 38, 41-48 (2010).

[17] M. Lachowicz, W. Nosko, Welding of structural steel Weldox 700, Welding Technology Review 82(1), 13-18 (2010).

[18] D. Schroepfer, T. Kannengiesser, Correlating welding reaction stresses and weld process conditions for high-strength steel S960QL, Weld World 58, 423-432 (2014).

[19] H. Sumi, K. Oi, K. Yasuda, Effect of chemical composition on microstructure and mechanical properties of laser weld metal of high-tensile-strength steel, Welding in the World 59, 173-178 (2015).

[20] M.St. Weglowski, S. Błacha, A. Phillips, Electron beam welding - Techniques and Trends - Review. Vacuum 130, 72-92 (2016).

[21] T. Hassel, R. Konya, M. Collmann, P. Schaumann, S. Priebe, T.A. Deißer, A. Beniyash, N. Murray, Fr.W. Bach, Economical joining of tubular steel towers for wind turbines employing non-vacuum electron beam welding for high-strength steels in comparison with submerged arc welding, Welding in the World 57, 551-559 (2013).

[22] Fr.W. Bach, A. Beniyash, K. Lau, R. Konya, Nonvacuum electron beam welding of structural steels; the Paton welding journal 5, 22-26 (2009).

[23] PN-EN 10025-6:2009, Hot rolled products of structural steels - Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition.

[24] H. Schultz, Electron beam welding. Abington Publishing, Cambridge, Great Britain, 1993.

[25] PN-EN ISO 15614-11:2005, Specification and qualification of welding procedures for metallic materials. Welding procedure test. Part 11: Electron and laser beam welding.

[26] P. Seyffarth, R. Schmidt, W.F. Demtschenko, U. Jasnau, Simulation of microstructure - transformation - kinetics of unalloyed constructional steel in case of fast thermal cycles. Proceedings of the 3rd LANE 2001, Meisenbach Verlag, Bamberg, (2001).

Archives of Metallurgy and Materials

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

Journal Information

IMPACT FACTOR 2016: 0.571
5-year IMPACT FACTOR: 0.776

CiteScore 2016: 0.85

SCImago Journal Rank (SJR) 2016: 0.347
Source Normalized Impact per Paper (SNIP) 2016: 0.740

Cited By


All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 321 318 15
PDF Downloads 110 108 3