Correlation Between the Resistance to Stress Corrosion Cracking of Steel Tubes of Gas Pipelines with Their Layerwise Texture Inhomogeneity
Abstract
In the present work, the influence of the tubes texture layering on their resistance to stress-corrosion cracking (SCC) is demonstrated by the example of several main gas pipelines (MGP) constructed of X70 steel tubes of different manufactures and operated under various exploitation conditions. X-ray studies of crystallographic texture and structural characteristics were implemented for external and internal layers of various tubes sections, which were cut out from MGP zones with fixed SCC defects and without them. Correlation between the depth of corrosion cracks and the thickness of the surface layer with sharply differing texture parameters is established. The system data analysis also shows that the presence of the texture component {110} <001> in the tubes surface layers can increase their resistance to the SCC.
Keywords: crystallographic texture, structure, texture layering, electron backscattered diffraction, stress corrosion cracking, main gas pipeline, hot rolling.
References
[1] A. Arabei et al, Steel in Translation, 39, N9 (2009) 725–732.
[2] Zheng M. Stress corrosion cracking in pipelines / W. Zheng, M. Elboujdaini, R. W. Revie // Stress corrosion cracking: Theory and practice edited by V. S. Raja, Tetsuo Shoji. – Woodhead Publishing Limited, Cambridge, UK, 2011. – P. 749–771.
[3] J.J. Jonas, Transformation textures associated with steel processing, in: A. Haldar, S. Suwas, D. Bhattacharjee (eds.) Microstructure and Texture in Steels, Springer, London, 2009, pp. 3-17.
[4] Yu. Perlovich, M. Isaenkova, O. Krymskaya, N. Morozov, Layer Texture of Hot-Rolled BCC Metal Materials and Its Significance for Main Gas Pipelines: submitted to AIP Conference Proceedings (2015).
[5] Yu. Perlovich, O. Krymskaya, M. Isaenkova et al., Effect of layerwise structural inhomogeneity on stress-corrosion cracking of steel tubes: submitted to IOP Conference Series: Materials Science and Engineering (2016).
[6] J.A. Szpunar, M.A. Arafin, A new understanding of intergranular stress corrosion cracking resistance of pipeline steel through grain boundary character and crystallographic texture studies, Corrosion Science, 51 (2009) 119-128.
[7] Perlovich Yu. A. Effect of layer-by-layer texture inhomogeneity on the stress corrosion of gas steel tubes / Perlovich Yu. A., Krymskaya O. A., Isaenkova M. G., Morozov N. S., Ryakhovskikh I. V. and Esiev T.S. // Materials Science Forum. 2017. -Vol.879. -pp1025-1030.
[8] M. Isaenkova, Yu. Perlovich, V. Fesenko, Modern methods of experimental construction of texture complete direct pole figures by using X-ray data, IOP Conf. Series: Materials Science and Engineering 130 (2016) 012055 doi:10.1088/1757- 899X/130/1/012055.
[9] LaboTex v. 3.0 by LaboSoft (Krakow, Poland) on http://www.labosoft.com.pl
[10] H.-J. Bunge, Texture Analysis in Materials Science, Butterworth, London, 1982.
[11] Yu. Perlovich, Development of strain hardening inhomogeneity during texture formation under rolling of BCC-metals, Numerical prediction of deformation processes and the behaviour of real materials: Proc. 15th Riso International Symposium on Materials Science, (1994) 445-450.
[12] Yu. Perlovich, M. Isaenkova, Effects of dynamical deformation ageing on structure and texture of hot-rolled sheets from alloyed bcc metals, Int J. Mater. Form. 3, N1 (2010) 1143 – 1146.