Scholarlink

<p>This study investigates the influence of low-pressure carburizing (LPC) on the microstructure, hardness, scratch resistance, tribological, and corrosion behavior of 17-4 precipitation hardening stainless steel (SS 17-4PH), fabricated by both conventional manufacturing (CM) and additive manufacturing (AM) via laser cladding (LC). SS 17-4PH is widely used in critical applications due to its mechanical strength and corrosion resistance; however, its surface hardness and wear resistance limit its application for high-load environments. A thermochemical surface treatment of LPC was applied to enhance these surface properties without compromising core toughness. The treated samples were characterized through microstructural analysis, microhardness profiling, scratch, tribological, and electrochemical corrosion testing. The LPC process significantly increased surface hardness, exceeding 700&#xa0;HV, attributed to iron and chromium carbides forming within the carburized layer, with effective case depths surpassing 50&#xa0;µm. Notably, following the LPC process, the samples exhibited a reduction in the coefficient of friction of approximately 75% and 80% for the materials produced by CM and AM, respectively, while wear rates decreased by 75% in CM samples. However, a trade-off was observed, as corrosion resistance decreased by approximately one order of magnitude, due to the formation of Cr-depleted zones and carbides, which inhibited the growth of the passivating layer. However, the corrosion resistance reaches levels comparable to some aluminum alloys. These results demonstrate that LPC is a promising surface engineering approach for extending the application range of SS 17-4PH in wear-critical environments. However, corrosion resistance should be considered depending on service conditions.</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

Effect of low-pressure carburizing on the microstructure, surface hardness, wear, and corrosion behavior of 17-4 PH stainless steel by conventional and additive manufacturing methods

  • 期刊论文

  • 发表日期：

    2025年7月30日

查看全文
  • L. M. Ballesteros,
  • J. A. Villada-Villalobos,
  • R. G. Bayro,
  • G. L. Galarza-Acosta,
  • J. S. Rudas,
  • J. M. González-Carmona

摘要

This study investigates the influence of low-pressure carburizing (LPC) on the microstructure, hardness, scratch resistance, tribological, and corrosion behavior of 17-4 precipitation hardening stainless steel (SS 17-4PH), fabricated by both conventional manufacturing (CM) and additive manufacturing (AM) via laser cladding (LC). SS 17-4PH is widely used in critical applications due to its mechanical strength and corrosion resistance; however, its surface hardness and wear resistance limit its application for high-load environments. A thermochemical surface treatment of LPC was applied to enhance these surface properties without compromising core toughness. The treated samples were characterized through microstructural analysis, microhardness profiling, scratch, tribological, and electrochemical corrosion testing. The LPC process significantly increased surface hardness, exceeding 700 HV, attributed to iron and chromium carbides forming within the carburized layer, with effective case depths surpassing 50 µm. Notably, following the LPC process, the samples exhibited a reduction in the coefficient of friction of approximately 75% and 80% for the materials produced by CM and AM, respectively, while wear rates decreased by 75% in CM samples. However, a trade-off was observed, as corrosion resistance decreased by approximately one order of magnitude, due to the formation of Cr-depleted zones and carbides, which inhibited the growth of the passivating layer. However, the corrosion resistance reaches levels comparable to some aluminum alloys. These results demonstrate that LPC is a promising surface engineering approach for extending the application range of SS 17-4PH in wear-critical environments. However, corrosion resistance should be considered depending on service conditions.