Investigating the Effects of Mitigation Techniques on Residual Stress and Microstructure of HSLA Welds

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Investigating the Effects of Mitigation Techniques on Residual Stress and Microstructure of HSLA Welds

H. Alipooramirabad, R. Ghomashchi, A. Paradowska, M. Reid

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Abstract. Post-weld heat treatment is often required for pressure vessel and piping components for relaxing residual stresses and increasing the resistance to brittle fracture. The present study employed neutron diffraction to examine the effects of conventional post-weld heat treatment (PWHT) on the residual stresses in multi-pass, high-strength, low-alloy-steel, weld joints made by combined Modified Short Arc Welding (MSAW) and Flux Cored Arc welding (FCAW) processes. Residual stresses in excess of yield strength were developed in the Heat Affected Zone (HAZ) and the weld metal of the as-welded specimen (particularly the upper layers of the weld) which were reduced significantly as a result of applying PWHT. Also PWHT lead to substantial changes in the microstructural characteristics of high-strength, low-alloy-steel welds.

Keywords
Microstructural Characterization, HSLA Welds, Neutron Diffraction, PWHT, Residual Stress

Published online 12/22/2016, 6 pages
Copyright © 2016 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: H. Alipooramirabad, R. Ghomashchi, A. Paradowska, M. Reid, ‘Investigating the Effects of Mitigation Techniques on Residual Stress and Microstructure of HSLA Welds’, Materials Research Proceedings, Vol. 2, pp 563-568, 2017

DOI: http://dx.doi.org/10.21741/9781945291173-95

The article was published as article 95 of the book Residual Stresses 2016

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

References
[1] Olabi A-G. Residual stresses and heat treatments for metallic welded components: Dublin City University; 1994.
[2] Aloraier A, Ibrahim R, Ghojel J. Eliminating post-weld heat treatment in repair welding by temper bead technique: role bead sequence in metallurgical changes. Journal of Materials Processing Technology. 2004;153:392-400. http://dx.doi.org/10.1016/j.jmatprotec.2004.04.383
[3] Paddea S, Francis JA, Paradowska AM, Bouchard PJ, Shibli IA. Residual stress distributions in a P91 steel-pipe girth weld before and after post weld heat treatment. Materials Science and Engineering: A. 2012;534:663-672. http://dx.doi.org/10.1016/j.msea.2011.12.024
[4] Smith DJ, Garwood SJ. Influence of postweld heat treatment on the variation of residual stresses in 50 mm thick welded ferritic steel plates. International Journal of Pressure Vessels and Piping. 1992;51:241-256. http://dx.doi.org/10.1016/0308-0161(92)90083-R
[5] Cho JR, Lee BY, Moon YH, Van Tyne CJ. Investigation of residual stress and post weld heat treatment of multi-pass welds by finite element method and experiments. Journal of Materials Processing Technology. 2004;155–156:1690-1695. http://dx.doi.org/10.1016/j.jmatprotec.2004.04.325
[6] Mitra A, Siva Prasad N, Janaki Ram GD. Influence of Temperature and Time of Post-weld Heat Treatment on Stress Relief in an 800-mm-Thick Steel Weldment. Journal of Materials Engineering and Performance. 2016;25:1384-1393. http://dx.doi.org/10.1007/s11665-016-1995-6
[7] Yu K, Jiang Z, Leng B, Li C, Chen S, Tao W, Zhou X, Li Z. Effects of post-weld heat treatment on microstructure and mechanical properties of laser welds in GH3535 superalloy. Optics & Laser Technology. 2016;81:18-25. http://dx.doi.org/10.1016/j.optlastec.2016.01.029
[8] Alipooramirabad H, Ghomashchi R, Paradowska A, Reid M. Residual stress- microstructure- mechanical property interrelationships in multipass HSLA steel welds. Journal of Materials Processing Technology. 2016;231:456-467. http://dx.doi.org/10.1016/j.jmatprotec.2016.01.020
[9] Alipooramirabad H, Paradowska A, Ghomashchi R, Kotousov A, Reid M. Quantification of residual stresses in multi-pass welds using neutron diffraction. Journal of Materials Processing Technology. 2015;226:40-49. http://dx.doi.org/10.1016/j.jmatprotec.2015.07.002
[10] Dong P, Song S, Zhang J. Analysis of residual stress relief mechanisms in post-weld heat treatment. International Journal of Pressure Vessels and Piping. 2014;122:6-14. http://dx.doi.org/10.1016/j.ijpvp.2014.06.002
[11] Zhang J, Dong P, Song S. Stress Relaxation Behavior in PWHT of Welded Components. ASME 2011 Pressure Vessels and Piping Conference: American Society of Mechanical Engineers; 2011. p. 673-679. http://dx.doi.org/10.1115/pvp2011-57826