Mechanism for improving low temperature impact toughness and fatigue durability of high-strength low-alloy steels for ap
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O R I G I NA L PA P E R
Victor E. Panin · Valery E. Egorushkin · Sergey V. Panin
Mechanism for improving low temperature impact toughness and fatigue durability of high-strength low-alloy steels for applications in the Arctic region
Received: 22 May 2020 / Revised: 25 July 2020 / Accepted: 21 September 2020 © Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract The effect of a lattice curvature on impact toughness at low temperatures is studied for the 09Mn2Si and 10Mn2VNbAl high-strength low-alloy (HSLA) steels having different compositions of doping elements. It is shown that the formation of the lattice curvature (several degrees/micrometer), in particular by helical rolling, significantly increases the low-temperature impact toughness of the HSLA steels, regardless of the alloying element compositions. This means that the observed effect could be characteristic of other HSLA steels subjected to complex thermo-mechanical treatment with the formation of the lattice curvature of a certain degree. Authors suggest that the perlite → bainite phase transformation develops under helical rolling at a temperature of ∼ 850 ◦ C. As a result, bainite is formed in the lattice curvature zones characterized by the presence of interstitial mesoscopic structural states where random rotational deformation modes could develop. This drastically improves the low temperature impact toughness of the HSLA steels and contributes to enhance their fatigue life and wear resistance.
1 Introduction Recently, the challenges of developing and operating new materials and technologies intended for the Arctic region have been actively discussed due to the demand for new offshore fields, as well as the prospects for intensifying the use of the Northern sea route [1,2]. In this regard, the experience of countries actively engaged in research and development of materials for low temperature applications over the past decades is of particular relevance [3–7]. In this field of knowledge, much attention has been paid to high-strength low-alloy (HSLA) steels and their welded joints, widely used for building pipelines and other objects of the Arctic region infrastructure [8–11]. V. E. Panin · V. E. Egorushkin · S. V. Panin (B) Institute of Strength Physics and Materials Science Siberian Branch of Russian Academy of Science, 2/4, Academichsky pr., Tomsk, Russian Federation 634055 E-mail: [email protected] V. E. Panin E-mail: [email protected] V. E. Egorushkin E-mail: [email protected] V. E. Panin National Research Tomsk Polytechnic University, Lenina pr., 30, Tomsk, Russian Federation 634050 V. E. Panin · V. E. Egorushkin National Research Tomsk State University, Lenina pr., 36, Tomsk, Russian Federation 634050
V. E. Panin et al.
Table 1 The composition of the studied HSLA steels, % Composition
C
Mn
V
09Mn2Si 10Mn2VNbAl
0.1 0.13
1.3–1.7 1.6
0.05
Cr
Nb
Si
Ti
Cu
Al
0.04
0.5–0.8 0.4
0.05
0.3 0.3
0.029
0.3
N 0.008
In this paper, an analysis of the structure modification of HSLA steels is carried out based on the mechanics app
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