Scholarlink

<p>Inconel 718 laser cladding layers with different boron (B) contents were fabricated on 304 austenitic stainless steel substrates by laser direct energy deposition (LDED), and the effect of B addition on the microstructure and properties were investigated in this study. The results demonstrate that the middle region of the cladding layers is characterized by equiaxed grains, whereas columnar grains dominate the bottom region. As the B content increases, the dendrite spacing initially decreases and then increases, reaching a minimum value of approximately 6&#xa0;μm at a B content of 0.01%. The borides become progressively more pronounced. The microhardness of all cladding layers is markedly superior to that of the substrate and exhibits a trend of initial increase followed by a decline as B content rises. The maximum hardness of 406.6 HV is achieved at 0.01% B, representing an improvement of 61.4 HV over the B-free Inconel 718 cladding layer. This specific composition also yields the best corrosion resistance, reflected by a corrosion potential of -0.14753&#xa0;V, a corrosion current density of 4.8372 × 10<sup>−7</sup>A cm<sup>−2</sup>, a corrosion rate of 0.0035895&#xa0;mm/a, and a polarization resistance of 2.5538 × 10<sup>5</sup> Ω cm².</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Microstructure, hardness and corrosion resistance of B-doped Ni-based superalloy laser cladding layers

  • 期刊论文

  • 发表日期：

    2026年4月22日

查看全文
  • Liang Wang,
  • Xinyue Chen,
  • Lin Chen,
  • Liyuan Huang,
  • Xiwei Zhang,
  • Peishan Zhou,
  • Bin Wang,
  • Hualin Zheng

摘要

Inconel 718 laser cladding layers with different boron (B) contents were fabricated on 304 austenitic stainless steel substrates by laser direct energy deposition (LDED), and the effect of B addition on the microstructure and properties were investigated in this study. The results demonstrate that the middle region of the cladding layers is characterized by equiaxed grains, whereas columnar grains dominate the bottom region. As the B content increases, the dendrite spacing initially decreases and then increases, reaching a minimum value of approximately 6 μm at a B content of 0.01%. The borides become progressively more pronounced. The microhardness of all cladding layers is markedly superior to that of the substrate and exhibits a trend of initial increase followed by a decline as B content rises. The maximum hardness of 406.6 HV is achieved at 0.01% B, representing an improvement of 61.4 HV over the B-free Inconel 718 cladding layer. This specific composition also yields the best corrosion resistance, reflected by a corrosion potential of -0.14753 V, a corrosion current density of 4.8372 × 10−7A cm−2, a corrosion rate of 0.0035895 mm/a, and a polarization resistance of 2.5538 × 105 Ω cm².