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Related Concept Videos

Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used to...

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Microstructural Evolution and Mechanical Properties of LPBF Ti-6Al-4V with Different Process Parameters.

Yuxin Shuai1, Jie Liu2, Jing Zhu1,3

  • 1School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China.

Materials (Basel, Switzerland)
|March 28, 2026
PubMed
Summary

Laser power, scanning speed, and hatch distance distinctly influence Ti-6Al-4V microstructure and properties in laser powder bed fusion (LPBF). These parameters, beyond just VED, enable tailored microstructural control and mechanical optimization for LPBF Ti64.

Keywords:
Ti-6Al-4Vlaser powder bed fusionprocess parametersprocess–microstructure relationshiptexturevariant selection

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Metallurgy

Background:

  • Laser Powder Bed Fusion (LPBF) is a key additive manufacturing technique for Ti-6Al-4V (Ti64).
  • Existing research often relies on Volumetric Energy Density (VED) for process optimization, obscuring individual parameter effects.
  • Distinct roles of laser power, scanning speed, and hatch distance on Ti64 microstructure and properties require clarification.

Purpose of the Study:

  • To investigate the independent effects of laser power, scanning speed, and hatch distance on Ti64.
  • To understand microstructural evolution and mechanical response within a stable LPBF processing window.
  • To establish correlations between processing parameters, microstructure, and mechanical properties.

Main Methods:

  • Designed 56 processing conditions for LPBF Ti64.
  • Characterized microstructure and texture using Optical Microscopy (OM), Scanning Electron Microscopy (SEM), and Electron Backscatter Diffraction (EBSD).
  • Assessed mechanical properties via microhardness (HV0.5) and hole-drilling residual stress measurements.

Main Results:

  • Prior-β grain morphology, α' martensite thickness, texture, microhardness, and residual stress showed distinct sensitivities to individual parameters.
  • Lower scanning speeds and smaller hatch distances promoted continuous <001>β epitaxial growth; higher speeds/larger distances led to fragmented grains.
  • α' lath thickness strongly depended on scanning speed, with laser power primarily modulating thermal effects.

Conclusions:

  • Process parameters, beyond VED, offer precise control over Ti64 microstructure and mechanical properties in LPBF.
  • Scanning speed and hatch distance significantly influence grain structure and martensite formation.
  • Microhardness correlates with α' martensite thickness, and residual stress is sensitive to specific parameters, enabling targeted optimization.