WAYS TO INCREASE THE YIELD STRENGTH OF AUSTENITIC CORROSION-RESISTANT STEEL FOR THE NUCLEAR INDUSTRY
DOI:
https://doi.org/10.32339/0135-5910-2025-12-43-53Keywords:
аустенитная коррозионно-стойкая сталь, трубы, атомная промышленность, предел текучести при повышенных температурах, стабилизирующий отжиг, микролегирование боромAbstract
Austenitic stainless steel 08Kh18N10T (AISI 321), stabilized with titanium, is used to manufacture nuclear power equipment and pipelines. One of the requirements for tubular products for nuclear reactors is a high yield strength, measured at 350°C, after final solution annealing in the temperature range of 1020–1080°C. This article reviews the scientific literature on ways to increase the yield strength of this steel. A literature review indicates that cold deformation of 08Kh18N10T steel accelerates the precipitation of dispersed titanium carbide particles, which inhibit static recrystallization during subsequent heating. Conversely, with increasing strain, the driving force for recrystallization increases. Therefore, to prevent static recrystallization during austenitization and ensure increased yield strength, the degree of preliminary deformation should be limited so that the increase in the driving force for recrystallization does not overwhelm the inhibiting effect of dispersed carbide precipitation. Plastic deformation of 08Kh18N10T steel in the temperature range of 800–900°C is accompanied by dynamic recovery and provides a more heat-stable dislocation structure capable of delaying recrystallization in the austenitizing temperature range. An increase in austenite grain size further suppresses static recrystallization and softening processes during annealing. However, in coarse-grained steel, deformation in the temperature range of 800–850°C may lead to the precipitation of chromium carbides, which reduce resistance to intergranular corrosion. Stabilization heat treatment, designed to increase the steel's resistance to intergranular corrosion, can simultaneously enhance the strength properties of 08Kh18N10T steel due to precipitation strengthening caused by titanium carbide particles. The effective method for increasing the strength properties of this steel is a combination of preliminary warm deformation followed by stabilization heat treatment. This ensures the simultaneous action of two strengthening mechanisms (work hardening and precipitation hardening), which, according to literature data, lead to a significant increase in the yield strength measured at a temperature of 350°C. It is noted that 08Kh18N10T steel, microalloyed with boron at a concentration of ~0.003 wt.%, is being considered as a promising material for nuclear power. Microadditions of boron not only increase yield strength but also reduce the steel's susceptibility to intergranular corrosion.
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