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<p>The effect of grain boundary carbides on mechanical properties and ductility-dip cracking (DDC) was investigated in Ni-Cr-Fe deposited metals. Microstructural analysis indicates that the segregation of Nb, Ti, and C during the solidification of Ni-Cr-Fe deposited metals promotes the precipitation of (Nb, Ti)C and Cr<sub>23</sub>C<sub>6</sub> at grain boundaries. As the Nb content increases (1.11-1.58 wt.%), the formation of M<sub>23</sub>C<sub>6</sub> carbides along grain boundaries is suppressed, leading to an improvement in impact energy from 55 to 90&#xa0;J and an increase in room-temperature tensile strength from 510 to 626&#xa0;MPa. According to stress-to-fracture (STF) and high-temperature tensile tests, M<sub>23</sub>C<sub>6</sub> accumulation at grain boundaries between 700 and 1000&#xa0;°C reduces intergranular strength, facilitates intergranular cracking, and enhances susceptibility to DDC. However, between 900 and 1000&#xa0;°C, partial dissolution and localized recrystallization of M<sub>23</sub>C<sub>6</sub> help restore the material’s plasticity.</p>

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Effect of Grain Boundary Carbides on the Mechanical Properties and Ductility-Dip Cracking of Ni-Cr-Fe Deposited Metals

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Yanchang Qi,
  • Guangchang Yang,
  • Zhaobo Li,
  • Cong Jiang,
  • Hao Yuan

摘要

The effect of grain boundary carbides on mechanical properties and ductility-dip cracking (DDC) was investigated in Ni-Cr-Fe deposited metals. Microstructural analysis indicates that the segregation of Nb, Ti, and C during the solidification of Ni-Cr-Fe deposited metals promotes the precipitation of (Nb, Ti)C and Cr23C6 at grain boundaries. As the Nb content increases (1.11-1.58 wt.%), the formation of M23C6 carbides along grain boundaries is suppressed, leading to an improvement in impact energy from 55 to 90 J and an increase in room-temperature tensile strength from 510 to 626 MPa. According to stress-to-fracture (STF) and high-temperature tensile tests, M23C6 accumulation at grain boundaries between 700 and 1000 °C reduces intergranular strength, facilitates intergranular cracking, and enhances susceptibility to DDC. However, between 900 and 1000 °C, partial dissolution and localized recrystallization of M23C6 help restore the material’s plasticity.