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Related Concept Videos

Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

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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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Steel manufacturing is a multi-stage process that begins by smelting iron ore into cast iron in a blast furnace. This initial stage involves layering iron ore with coke, a type of fuel, and crushed limestone within the furnace. The coke is ignited with a high volume of air, leading to the creation of carbon monoxide, which acts to reduce the iron ore to pure iron.
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Bending of Members Made of Several Materials01:11

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Steel Fastening Techniques01:17

Steel Fastening Techniques

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Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Addressing H-Material Interaction in Fast Diffusion Materials-A Feasibility Study on a Complex Phase Steel.

Agustina Massone1,2, Armin Manhard3, Andreas Drexler4

  • 1Materials Center Leoben, Forschungs GmbH, Roseggerstrasse 12, 8700 Leoben, Austria.

Materials (Basel, Switzerland)
|October 23, 2020
PubMed
Summary
This summary is machine-generated.

Hydrogen embrittlement (HE) in advanced steels is a challenge for the automotive industry. This study used in-situ plasma charging to observe hydrogen

Keywords:
advanced high-strength steelshydrogen embrittlementin-situ testingplasma chargingscanning electron microscopy

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Hydrogen embrittlement (HE) poses a significant challenge to the application of advanced high-strength steels (AHSS) in demanding sectors like the automotive industry.
  • Understanding the interaction between hydrogen and complex phase steels is crucial for mitigating HE effects.
  • Existing methods often struggle with hydrogen outgassing during mechanical testing of fast-diffusing materials.

Purpose of the Study:

  • To investigate the effects of in-situ hydrogen charging on the mechanical properties and fracture behavior of complex phase steels.
  • To establish a direct observation method for hydrogen's influence during mechanical testing.
  • To quantify hydrogen concentration and its correlation with observed material changes.

Main Methods:

  • In-situ mechanical testing with continuous plasma charging to supply hydrogen.
  • Analysis of different plasma charging conditions.
  • Calculation of hydrogen concentration using analytical and simulation models.
  • Microstructural examination of fracture surfaces (dimple size).
  • Investigation of strain rate sensitivity of flow properties.

Main Results:

  • No pronounced effect on overall mechanical properties was observed under the tested plasma charging conditions.
  • Calculated hydrogen concentrations remained below the critical threshold for significant embrittlement.
  • A decrease in dimple size was observed in the presence of hydrogen.
  • Crack propagation rate increased with increasing hydrogen charging time.
  • The material exhibited no significant strain rate sensitivity, confirming hydrogen's role in crack propagation.

Conclusions:

  • Despite low overall hydrogen concentrations, hydrogen influences fracture behavior by reducing dimple size and increasing crack propagation rates.
  • In-situ observation is vital for understanding hydrogen effects in fast-diffusing materials.
  • Technological strategies can be explored to increase the maximum achievable solute hydrogen concentration for potentially greater embrittlement effects.