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<p>This study delves deeply into the aging precipitation behavior of Cu-Nb cooperatively strengthened ferritic stainless steel at 973.15&#xa0;K. The results indicate that there are four types of Nb-bearing precipitates, namely (Fe, Cr, Si)<sub>2</sub>(Nb, Ti), (Nb, Ti)<sub>2</sub>C, (Nb, Ti)C and NbTiC<sub>2</sub>. The Nb-bearing precipitates located at the grain boundaries possess a smaller radius, a more compact distribution spacing and a greater quantity. The interface between Cu-bearing precipitates and matrix changes from coherent to incoherent with the change of crystal structure during ripening. The ripening rate of Nb-bearing precipitates is 45 times higher than that of Cu-bearing precipitates. The sharp position of the block-shaped Nb-bearing precipitates promotes the formation of new Nb-bearing precipitates, resulting in the feathery agglomeration of Nb-bearing precipitates. The high-strain field at the tip of the long diameter of Cu-bearing precipitates can also promote the precipitation of Nb-bearing precipitates, which results in the attachment of Nb-bearing and Cu-bearing precipitates.</p>

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Aging Precipitation Behavior of Cu-Nb Synergistic Strengthened Ferritic Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Mingkun Jiang,
  • Ying Han,
  • Weiwei Zhu,
  • Guoqing Zu,
  • Qi Sui,
  • Xu Ran

摘要

This study delves deeply into the aging precipitation behavior of Cu-Nb cooperatively strengthened ferritic stainless steel at 973.15 K. The results indicate that there are four types of Nb-bearing precipitates, namely (Fe, Cr, Si)2(Nb, Ti), (Nb, Ti)2C, (Nb, Ti)C and NbTiC2. The Nb-bearing precipitates located at the grain boundaries possess a smaller radius, a more compact distribution spacing and a greater quantity. The interface between Cu-bearing precipitates and matrix changes from coherent to incoherent with the change of crystal structure during ripening. The ripening rate of Nb-bearing precipitates is 45 times higher than that of Cu-bearing precipitates. The sharp position of the block-shaped Nb-bearing precipitates promotes the formation of new Nb-bearing precipitates, resulting in the feathery agglomeration of Nb-bearing precipitates. The high-strain field at the tip of the long diameter of Cu-bearing precipitates can also promote the precipitation of Nb-bearing precipitates, which results in the attachment of Nb-bearing and Cu-bearing precipitates.