Conclusions
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1.
When up to 0.1% of Zr is introduced to steel 09G2, its mechanical properties (σu, σy, δ and ψ) virtually do not improve after controlled rolling; in this case, however, the impact strength is increased by 20–50% at temperatures of −40°C and lower, and the work of crack development also increases over the entire temperature interval investigated.
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2.
The impact strength of the steel with zirconium increases as a result of an increase in the work of crack propagation. Its maximum value is reached at 0.1% Zr; when its content is increased to 0.18%, the resistance to fracture development is reduced, but it is, nevertheless, higher than that of the zirconium-free steel.
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3.
The improvement in the steel's ability to resist fracture development when zirconium is introduced is governed by grain-size reduction and also by the shape and arrangement of the nonmetallic inclusions.
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Additional information
I. P. Bardin Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 26–28, April, 1990.
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Popova, L.V., Nasibov, A.G. Effect of zirconium on the properties of steel 09G2 after controlled rolling. Met Sci Heat Treat 32, 267–269 (1990). https://doi.org/10.1007/BF00729868
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DOI: https://doi.org/10.1007/BF00729868