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<p>The structural and textural states formed in samples of stainless steel of the ferritic-martensitic class, close in composition to Cr12NiMoWoSiVNb, are studied by the method of scanning electron microscopy using orientation analysis and software for reconstruction of high-temperature austenitic grains. The samples are taken from a hot-rolled pipe that has been quenched in water and tempered at a high temperature. The samples are heat treated by holding at 950°C and cooling at different rates (in water, in air, in the furnace). At all the cooling rates, the steel structure consists of grains of δ-ferrite and martensite and contains coarse precipitates of (NbMo)(CN) carbonitrides and finer M<sub>23</sub>C<sub>6</sub> and (VNb)C carbides. When the phase transformations occur in the sequence δ + α′ → δ + γ → δ + α′, the steel inherits structural and textural features due to nucleation of a new phase on special boundaries.</p>

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Influence of Cooling Rate on Formation of Structural and Textural States in Ferritic-Martensitic Stainless Steel with 12 wt.% Chromium

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • V. I. Pastukhov,
  • A. E. Ustinov,
  • V. Y. Yarkov,
  • S. V. Solov’yeva,
  • M. L. Lobanov

摘要

The structural and textural states formed in samples of stainless steel of the ferritic-martensitic class, close in composition to Cr12NiMoWoSiVNb, are studied by the method of scanning electron microscopy using orientation analysis and software for reconstruction of high-temperature austenitic grains. The samples are taken from a hot-rolled pipe that has been quenched in water and tempered at a high temperature. The samples are heat treated by holding at 950°C and cooling at different rates (in water, in air, in the furnace). At all the cooling rates, the steel structure consists of grains of δ-ferrite and martensite and contains coarse precipitates of (NbMo)(CN) carbonitrides and finer M23C6 and (VNb)C carbides. When the phase transformations occur in the sequence δ + α′ → δ + γ → δ + α′, the steel inherits structural and textural features due to nucleation of a new phase on special boundaries.