Journals →  CIS Iron and Steel Review →  2020 →  #2 →  Back

Metal science and metallography
ArticleName Quantitative assessment of microstructural inhomogeneity by thickness of hot-rolled plates made of cold-resistant low-alloy steel for Arctic applications
DOI 10.17580/cisisr.2020.02.10
ArticleAuthor A. A. Kazakov, D. V. Kiselev, O. V. Sych, E. I. Khlusova
ArticleAuthorData

Peter the Great St. Petersburg Polytechnic University (St. Petersburg, Russia):

A. A. Kazakov, Dr. Eng., Prof., Head of “Metallurgical Examination” Lab., E-mail: kazakov@thixomet.ru

 

“Thixomet” JSC (St. Petersburg, Russia):
D. V. Kiselev, Technical Director, “Metallurgical Examination” Lab.


National Research Center “Kurchatov Institute” — Central Research Institute of Structural Materials “Prometey” (St. Petersburg, Russia):
O. V. Sych, Cand. Eng., Head of the Sector,
E. I. Khlusova, Dr. Eng., Prof., Deputy Head of Scientific and Production Center No. 3 (NPK-3), Head of the Laboratory

Abstract

A technique to assess microstructural anisotropy assessing by the thickness of the plate steel based on the texture analysis of the image has been developed. This technique provides for the anisotropy assessment at two dimensional levels: in the short-distance and long-distance neighborhoods, which characterize the elongation along the rolling direction of fine and coarse structural constituents, respectively. The practical approval results of this technique in the study of the microstructural heterogeneity of ferritic-bainitic steels over the thickness of 25–70 mm hot-rolled plates have been presented. It has been shown that the proposed anisotropy criteria in combination with the volume fraction of coarse packet-block regions of lath bainite as well as regions of bainite without an internal developed subgrain structure adequately estimate the microstructural heterogeneity over the thickness of plate steel and can be used for a detailed interpretation of the two-stage thermomechanical processing technology with accelerated cooling including taking into account the metallurgical inheritance of the slab.

keywords Cold-resistant plate steel, inhomogeneity by thickness, microstructural anisotropy, automated assessment on panoramic images
References

1. Gusev M. A., Ilyin A. V., Larionov A.V. Certification of shipbuilding materials for ships operating in the Arctic. Shipbuilding. 2014. No. 5 (816). pp. 39–43.
2. Filin V. Yu. Quality control of steels for large-sized welded constructions for the Arctic shelf. Application of Russian and foreign requirements. Voprosy Materialovedenia. 2019. No. 2(98). pp. 136–153.
3. ND No. 2-020101-114. Rules for the classification and construction of sea-going ships. Part XIII. Materials. St. Petersburg: Russian Maritime Register of Shipping. 2019. p. 241.
4. Isasti N., Jorge-Badiola D., Taheri ML, Uranga P. Microstructural Features Controlling Mechanical Properties in Nb–Mo Microalloyed Steels. Part II: Impact Toughness. Metallurgical and Materials Transactions A. 2014. Vol. 45. pp. 4972–4982.
5. Hu J., Du L. X., Zang M., Yin S. J., Wang Y. G., Qi X. Y., Gao X. H., Misra R. D. K. On the determining role of acicular ferrite in V-N microalloyed steel in increasing strength-toughness combination. Materials Characterization. 2016. Vol. 118. pp. 446–453.
6. Kazakov A. A., Kiselev D. V. Industrial application of Thixomet Image Analyzer for quantitative description of steel and alloys microstructure. Metallography, Microstructure, and Analysis. 2016. Vol. 5. No. 4. pp. 294–301.
7. Kazakov A. A., Kiselev D. V., Pakhomova O. V. Quantitative description of microstructure for structure-property relationships of pipeline plate steel. CIS Iron and Steel Review. 2012, Vol. 7. pр. 4–12.
8. Saltykov S. A. Stereometric metallography. 3rd edition, revised and enlarged, Moscow: Metallurgiya. 1970, 376 p.
9. ASTM E1268-19, Standard Practice for Assessing the Degree of Banding or Orientation of Microstructures, ASTM International, West Conshohocken, PA, 2019, www.astm.org.
10. Otsu N. A Threshold Selection Method from Gray-Level Histograms. IEEE Transactions on Systems, Man, and Cybernetics. 1979. Vol. 9. No. 1 (Jan.). pp. 62–66.
11. Gorelik S. S., Dobatkin S. V., Kaputkina L. M. Recrystallization of metals and alloys. Moscow: Izdatelskiy dom MISiS. 2005. 432 p.
12. Opiela M., Ozgowicz W. Effects of Nb, Ti and V on recrystallization kinetics of austenite in microalloyed steels. Journal of Achievements in Materials and Manufacturing Engineering. 2012. Vol. 55/2. pp. 759–771.
13. Sakai T., Belyakov A., Kaibyshev R., Miura H., Jonas J. J. Dynamic and post-dynamic recrystallization under hot, cold and severe plastic deformation conditions. Progress in Materials Science. 2014. Vol.60. pp. 130–207.
14. Rybin V. V. Large plastic deformation and destruction of metals. Moscow: Metallurgiya. 1986. 224 p.
15. Koneva N. A., Trishkina L. I., Kozlov E. V. Physics of substructural and grain-boundary strengthening. Fundamental problems of modern materials science. 2014. Vol. 11. No. 4. pp. 522–528.
16. Isasti N., Jorge-Badiola D., Taheri M. L., Uranga P. Phase Transformation Study in Nb-Mo Microalloyed Steels Using Dilatometry and EBSD Quantication. Metallurgical and materials transactions A. 2013. Vol. 44. pp. 3552–3563.
17. Goli-Oglu E. A., Bokachev Yu. A. Thermomechanical treatment of low-alloy structural steel plates up to 100 mm thick in NLMK DanSteel. Stal. 2014. No. 9. pp. 71–78.
18. Poletskov P. P., Denisov S. V., Nikitenko O. A., Chukin D. M., Gushchina M. S. Investigation of the decomposition of supercooled austenite in low-carbon pipe steel using the Gleeble 3500 complex. Izvestiya vysshikh uchebnykh zavedenii. Chernaya metallurgiya. 2019. Vol. 62. No. 3. pp. 235–240.
19. Hai-long Yi, Lin-xiu Du, Guo-dong Wang, Xiang-hua Liu. Bainite Transformation Under Continuous Cooling of Nb-Microalloyed Low Carbon Steel. Journal of Iron and Steel Research, International. 2006. Vol. 13(3). pp. 36–39.
20. Goli-Ogly E. A., Kichkina A. A. Micro- and nanostructural nonuniformity through the thickness of 100 mm structural steel plate after TMT and HT. Меtallurgist. 2017. Vol. 60. No. 11-12. pp. 1161–1168.
21. Nastich S. Y., Matrosov M. Y. High-strength pipe steel structure formation during thermomechanical treatment. Меtallurgist. 2016. Vol. 59. No. 9-10. pp. 784–794.
22. Kazakov A. A., Kazakova Е. I., Kiselev D. V., Kurochkina О. V. Investigation method of pipe steel’s structure. Patent RUS 2449055 18.10.2010.

Full content Quantitative assessment of microstructural inhomogeneity by thickness of hot-rolled plates made of cold-resistant low-alloy steel for Arctic applications
Back