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Related Concept Videos

Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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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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Diffusion Bonding 321-Grade Stainless Steel: Failure and Multimodal Characterization.

Isac Lazar1, Axel Knutsson2, Hector Pous Romero2

  • 1Department of Physics, Division of Synchrotron Radiation Research, Lund University, 221 00 Lund, Sweden.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|March 25, 2024
PubMed
Summary
This summary is machine-generated.

Vacuum diffusion bonding of stainless steel 321H for high-temperature applications is hindered by Ti(C, N) precipitation. This study reveals Ti diffusion and nucleation on oxides, impacting bond strength.

Keywords:
PEEMTEMTi-rich precipitationcore-shelldiffusion bondingmicrostructurestainless steel

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Area of Science:

  • Materials Science
  • Metallurgy
  • Chemical Engineering

Background:

  • Printed circuit heat exchangers are vital for next-generation energy systems requiring high-temperature and high-pressure capabilities.
  • Vacuum diffusion bonding is a key joining technology for these applications.
  • High-temperature materials often exhibit poor bond strength due to precipitation at the bond line, impeding grain boundary migration.

Purpose of the Study:

  • To investigate the cause of poor mechanical properties in vacuum diffusion-bonded grade 321H stainless steel.
  • To elucidate the microstructural evolution and precipitation mechanisms at the bond line during high-temperature diffusion bonding.

Main Methods:

  • In situ studies of diffusion bonding for grade 321H stainless steel.
  • Analysis of precipitation at the bond line.
  • Investigation of titanium diffusion and its interaction with other precipitates.

Main Results:

  • Poor mechanical properties in grade 321H are attributed to Ti(C, N) precipitation at the bond line.
  • Titanium was observed to diffuse from the bulk to the mating surfaces at high temperatures.
  • A novel core-shell structure was observed where Ti(C, N) nucleated on Al/Mg-oxide precipitates.

Conclusions:

  • Alloying elements, even in small amounts, significantly influence diffusion bond quality.
  • Understanding microstructural evolution during bonding is crucial for optimizing high-temperature material applications.
  • Further research into bonding conditions and alloying effects is warranted.