Abstract
A novel corrosion-resistant steel with high boron content is investigated in this paper. Three stages during crystallisation of the steel are revealed. The positive influence of Zr addition on the microstructure and mechanical properties after hot deformation is shown. The Zr-alloyed steel demonstrates hot deformation without fracturing in the temperature range of 1273–1423 K, and in the strain rate range of 0.1–10 s−1, despite the high volume of brittle borides. The processes of ferrite recrystallisation and boride structure fragmentation occur during hot deformation, promoting the appearance of a peak on stress–strain curves.
Highlights
Stainless steels with high boron content are important materials for the production of spent nuclear fuel storage due to the high neutron-absorbing capacity of boron [1,2]
The addition of the steel by the borides forming elements such as Ti and Zr may have a positive influence on the microstructure
The purpose of our work is to investigate the microstructure and hot deformation behaviour of a novel Zr-alloyed stainless steel with high boron content
Summary
Stainless steels with high boron content (more than 1.2 wt. %) are important materials for the production of spent nuclear fuel storage due to the high neutron-absorbing capacity of boron [1,2].Conversion of the nuclear power plants to more enriched fuel requires improved neutron-absorbing capacity of the materials. %) are important materials for the production of spent nuclear fuel storage due to the high neutron-absorbing capacity of boron [1,2]. % are required to guarantee the safety and efficiency of spent nuclear fuel storage This type of material is very attractive for application as a high-speed steel, due to a high degree of hardness and good wear resistance of the borides [3,4]. The low technological plasticity of high-boron steels limits their applications because of the high costs of their production. In this case, the preliminary investigation of the microstructure and deformation behaviour of hard deformable steels is required to develop improved industrial technologies.
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