Scholarlink

<p>The tribological behavior of selective laser melted (SLM) Ti-6Al-4V alloy was investigated, and it examines the impact of SLM process parameters—laser power, scanning speed, layer thickness, and hatch spacing—on the microstructure, hardness, wear resistance, and coefficient of friction (COF). The rapid solidification inherent in SLM promotes the formation of a fine α′-martensitic structure, enhancing hardness to approximately 450-500 HV, which improves wear resistance but increases brittleness. Tribological assessments under varying loads and sliding conditions reveal a strong correlation between hardness and wear resistance, with optimized SLM parameters achieving a 35% reduction in wear rate compared to as-built samples. However, excessive hardness leads to brittle fracture, microcracking, and delamination wear. SEM analysis identifies dominant wear mechanisms, including adhesive, abrasive, oxidative, and fretting wear, influenced by contact pressure and sliding speed. The formation of tribo-oxidative layers reduces COF, with an observed average reduction of 15%, though surface roughness effects lead to higher friction compared to conventionally processed alloys. The introduction of post-processing treatments such as heat treatment and laser surface texturing significantly refines the microstructure, reducing residual stresses and porosity. Optimized SLM parameters—250 W laser power, 1000 mm/s scanning speed 40&#xa0;µm layer thickness, and 100&#xa0;µm hatch spacing—resulted in better material property.</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

Tribological and Mechanical Behavior of Additive Manufactured Titanium Alloy Utilizing SLM Process

  • 期刊论文

  • 发表日期：

    2025年8月20日

查看全文
  • D. Nijesh,
  • R. Ranjith,
  • T. CH. Anil Kumar,
  • Sheeja Jayachandran

摘要

The tribological behavior of selective laser melted (SLM) Ti-6Al-4V alloy was investigated, and it examines the impact of SLM process parameters—laser power, scanning speed, layer thickness, and hatch spacing—on the microstructure, hardness, wear resistance, and coefficient of friction (COF). The rapid solidification inherent in SLM promotes the formation of a fine α′-martensitic structure, enhancing hardness to approximately 450-500 HV, which improves wear resistance but increases brittleness. Tribological assessments under varying loads and sliding conditions reveal a strong correlation between hardness and wear resistance, with optimized SLM parameters achieving a 35% reduction in wear rate compared to as-built samples. However, excessive hardness leads to brittle fracture, microcracking, and delamination wear. SEM analysis identifies dominant wear mechanisms, including adhesive, abrasive, oxidative, and fretting wear, influenced by contact pressure and sliding speed. The formation of tribo-oxidative layers reduces COF, with an observed average reduction of 15%, though surface roughness effects lead to higher friction compared to conventionally processed alloys. The introduction of post-processing treatments such as heat treatment and laser surface texturing significantly refines the microstructure, reducing residual stresses and porosity. Optimized SLM parameters—250 W laser power, 1000 mm/s scanning speed 40 µm layer thickness, and 100 µm hatch spacing—resulted in better material property.