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<p>To further improve the toughness of the hypereutectic Fe-B hardfacing alloy, the effect of niobium (Nb) on the microstructure, toughness, and wear resistance of the alloy was studied. The results show that the microstructure of the alloy is mainly composed of Fe<sub>2</sub>B, NbFeB, and α-Fe after adding the Nb element. With the increase of Nb content, the volume fraction of primary Fe<sub>2</sub>B gradually decreases, and the volume fraction of NbFeB and α-Fe increases. The eutectic structure transforms from Fe<sub>2</sub>B + α-Fe to lamellar NbFeB + α-Fe. When the Nb content is 19.7 wt.%, the alloy has the highest impact toughness and fracture toughness, which are 30.8&#xa0;J/cm<sup>2</sup> and 21.6&#xa0;MPa&#xa0;m<sup>1/2</sup>, respectively. The fracture mode changes from cleavage fracture to cleavage fracture + ductile fracture, which significantly improves the toughness of the alloy. The macrohardness and abrasive wear weight loss show a trend of first increasing and then decreasing with the addition of Nb content. When the Nb content was 6.6 wt.%, the Rockwell hardness of the alloy was 64.2 HRC, and the minimum wear weight loss under 48 N load was 60.2&#xa0;mg. Adding Nb is an effective way to improve the toughness of Fe-B alloy.</p>

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Effect of Nb Addition on Microstructure Evolution and Wear Resistance of Hypereutectic Fe-B Surfacing Alloy

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Zhen Ma,
  • Yu-Dong Yan,
  • Yuan-Hu Zhang,
  • Qiang Li,
  • Qi-Cong Liu,
  • Shi-Dan Yuan,
  • Hui Yang,
  • Ming-Zhong Wu,
  • Ming-Hui Zhuang

摘要

To further improve the toughness of the hypereutectic Fe-B hardfacing alloy, the effect of niobium (Nb) on the microstructure, toughness, and wear resistance of the alloy was studied. The results show that the microstructure of the alloy is mainly composed of Fe2B, NbFeB, and α-Fe after adding the Nb element. With the increase of Nb content, the volume fraction of primary Fe2B gradually decreases, and the volume fraction of NbFeB and α-Fe increases. The eutectic structure transforms from Fe2B + α-Fe to lamellar NbFeB + α-Fe. When the Nb content is 19.7 wt.%, the alloy has the highest impact toughness and fracture toughness, which are 30.8 J/cm2 and 21.6 MPa m1/2, respectively. The fracture mode changes from cleavage fracture to cleavage fracture + ductile fracture, which significantly improves the toughness of the alloy. The macrohardness and abrasive wear weight loss show a trend of first increasing and then decreasing with the addition of Nb content. When the Nb content was 6.6 wt.%, the Rockwell hardness of the alloy was 64.2 HRC, and the minimum wear weight loss under 48 N load was 60.2 mg. Adding Nb is an effective way to improve the toughness of Fe-B alloy.