Scholarlink

<p>Selective laser melting (SLM) was employed to fabricate Ti6Al4V samples, focusing on laser energy density ranges suitable for industrial applications. The process involved nine levels of laser energy density (66.66–113.09&#xa0;J/mm<sup>3</sup>) to achieve full density in the SLM-fabricated products. Experimental results demonstrated that the Archimedes relative density of the specimens increased to 99.86%. At this density level, characterized by minimal porosity, microstructural analysis revealed the presence of pores both on the surface and within the internal regions. The various laser energy density levels, including lower, higher, and optimal values, promoted the αˈ-phase microstructure, thereby affecting the microhardness. X-ray diffractometer (XRD) analysis confirmed the presence of acicular αˈ-phases in the SLM Ti6Al4V components. Fatigue tests, including high-cycle fatigue (HCF) and low-cycle fatigue (LCF), were conducted on the samples exhibiting minimal porosity and refined microstructure, yielding fatigue limits of 140&#xa0;MPa and lifetimes up to <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="170_2025_15630_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="23" /> </InlineMediaObject> <EquationSource Format="TEX">\({10}^{7}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mn>10</mn> </mrow> <mn>7</mn> </msup> </math></EquationSource> </InlineEquation> cycles. The results demonstrated that fatigue cracks in the Ti6Al4V alloy predominantly originated from surface-connected pores. The relationships between microstructure, porosity, and fractography revealed that the rapid cooling in the SLM process limited crystal growth, leading to smaller crystal sizes and influencing fatigue performance. The findings highlight the practical significance of optimizing laser energy density in improving the mechanical and fatigue properties of SLM-fabricated Ti6Al4V components by reducing porosity and promoting the formation of strong metallurgical bonds in the microstructure.</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

Effects of porosity and microstructure on the fatigue fracture properties of ti6al4v alloy produced through selective laser melting

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年5月14日

查看全文
  • Simge Gencalp Irizalp,
  • Nursen Saklakoglu,
  • Cansu Apaydin,
  • Kemal Ayan

摘要

Selective laser melting (SLM) was employed to fabricate Ti6Al4V samples, focusing on laser energy density ranges suitable for industrial applications. The process involved nine levels of laser energy density (66.66–113.09 J/mm3) to achieve full density in the SLM-fabricated products. Experimental results demonstrated that the Archimedes relative density of the specimens increased to 99.86%. At this density level, characterized by minimal porosity, microstructural analysis revealed the presence of pores both on the surface and within the internal regions. The various laser energy density levels, including lower, higher, and optimal values, promoted the αˈ-phase microstructure, thereby affecting the microhardness. X-ray diffractometer (XRD) analysis confirmed the presence of acicular αˈ-phases in the SLM Ti6Al4V components. Fatigue tests, including high-cycle fatigue (HCF) and low-cycle fatigue (LCF), were conducted on the samples exhibiting minimal porosity and refined microstructure, yielding fatigue limits of 140 MPa and lifetimes up to \({10}^{7}\) 10 7 cycles. The results demonstrated that fatigue cracks in the Ti6Al4V alloy predominantly originated from surface-connected pores. The relationships between microstructure, porosity, and fractography revealed that the rapid cooling in the SLM process limited crystal growth, leading to smaller crystal sizes and influencing fatigue performance. The findings highlight the practical significance of optimizing laser energy density in improving the mechanical and fatigue properties of SLM-fabricated Ti6Al4V components by reducing porosity and promoting the formation of strong metallurgical bonds in the microstructure.