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<p>This study reveals novel insights into the FeB-Fe<sub>2</sub>B layer growth on AISI 1018 steel exposed to the Pulsed-DC Powder-Pack Boriding (PDCPB). In this research, cylindrical specimens with varying lengths (~0.19 to ~ 0.80&#xa0;cm) and surface areas (3.33 to 16.48&#xa0;cm<sup>2</sup>) were analyzed, considering mass change (Δ<i>m</i>), surface-to-volume ratio (SVR), and steel length change (Δ<i>h</i>). PDCPB was conducted at 800&#xa0;°C for 3600&#xa0;s, considering 7.5 A current intensity and 10&#xa0;s of polarity inversion cycles. Results revealed that a decreasing initial surface area (<i>A</i><sub>o</sub>) increased boride layer thickness due to a higher SVR, Joule effect, and the availability of boron ions (B<sup>+</sup>). Mass gain (<i>G</i>(<i>t</i>)) was estimated through an analysis from the Fe-B phase diagram, while Δ<i>h</i> was attributed to the boride layer thickness, both exhibiting deviations below 10% with respect to validation data. PDCPB demonstrated advantages over conventional methods, enabling controlled layer growth through the interaction of electrical and geometric parameters.</p>

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Effect of AISI 1018 Steel Dimensions on FeB-Fe2B Layer Growth and Electric Field Strength Variations during Pulsed-DC Powder-Pack Boriding

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • I. Campos-Silva,
  • Y. A. Figueroa-Ruiz,
  • M. Olivares-Luna,
  • K. D. Chaparro-Pérez,
  • L. E. Castillo-Vela,
  • J. L. Rosales-Lopez,
  • S. Jimenez-Corona

摘要

This study reveals novel insights into the FeB-Fe2B layer growth on AISI 1018 steel exposed to the Pulsed-DC Powder-Pack Boriding (PDCPB). In this research, cylindrical specimens with varying lengths (~0.19 to ~ 0.80 cm) and surface areas (3.33 to 16.48 cm2) were analyzed, considering mass change (Δm), surface-to-volume ratio (SVR), and steel length change (Δh). PDCPB was conducted at 800 °C for 3600 s, considering 7.5 A current intensity and 10 s of polarity inversion cycles. Results revealed that a decreasing initial surface area (Ao) increased boride layer thickness due to a higher SVR, Joule effect, and the availability of boron ions (B+). Mass gain (G(t)) was estimated through an analysis from the Fe-B phase diagram, while Δh was attributed to the boride layer thickness, both exhibiting deviations below 10% with respect to validation data. PDCPB demonstrated advantages over conventional methods, enabling controlled layer growth through the interaction of electrical and geometric parameters.