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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.
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General Reference and Design S-N Curves Obtained for 1.2709 Tool Steel.

Michał Böhm1, Adam Niesłony1, Szymon Derda1

  • 1Department of Mechanics and Machine Design, Faculty of Mechanical Engineering, Opole University of Technology, Mikołajczyka 5, 45-271 Opole, Poland.

Materials (Basel, Switzerland)
|March 11, 2023
PubMed
Summary

This study presents design fatigue curves for EN 1.2709 tool steel produced via selective laser melting. These curves are crucial for engineers designing dynamically loaded structures with 3D-printed components.

Keywords:
1.2709 steel3D-printed materialsSLM 3D printingS–N curvesfatigue of materials

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Additive Manufacturing

Background:

  • Advanced fatigue calculation models necessitate reliable design S-N curves for novel materials.
  • 3D-printed steel components, like EN 1.2709 tool steel, are increasingly used in dynamically loaded structures.
  • Fatigue strength of 3D-printed EN 1.2709 steel can vary significantly with printing method and exhibit scatter.

Purpose of the Study:

  • To present selected S-N curves for EN 1.2709 tool steel fabricated using selective laser melting.
  • To compare the fatigue characteristics of this material under tension-compression loading.
  • To develop a combined reference and design fatigue curve for engineering applications.

Main Methods:

  • Selective laser melting (SLM) for EN 1.2709 steel component fabrication.
  • Fatigue testing to generate S-N curves under tension-compression loading.
  • Compilation of experimental data with existing literature for curve development.

Main Results:

  • Selected S-N curves for SLM-printed EN 1.2709 steel are presented.
  • Fatigue resistance characteristics under tension-compression loading are analyzed.
  • A combined general mean reference and design fatigue curve is proposed.

Conclusions:

  • The developed design fatigue curve provides a reliable tool for engineers.
  • This curve can be implemented in finite element method (FEM) analyses for fatigue life calculations.
  • The findings are critical for the safe design of dynamically loaded structures using additively manufactured EN 1.2709 steel.