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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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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Carbide characterization in low-temperature tempered steels.

Chen Zhu1, Alfred Cerezo, George D W Smith

  • 1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.

Ultramicroscopy
|February 10, 2009
PubMed
Summary
This summary is machine-generated.

Early steel tempering forms debated carbon-rich regions, not just epsilon carbide. Three-dimensional atom probe analysis reveals these regions have up to 10% carbon and internal faulting.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Physical Chemistry

Background:

  • The precise nature of initial carbides during steel tempering remains contentious.
  • Conventional understanding identifies epsilon carbide (Fe2.4C) as the primary transition carbide.
  • Previous one-dimensional atom probe (1DAP) studies suggested lower carbon content regions, but faced interpretation challenges.

Purpose of the Study:

  • To clarify the composition and structure of early-stage tempering precipitates in steels.
  • To resolve discrepancies in previous atom probe analyses of steel tempering.
  • To investigate carbon-rich regions using advanced three-dimensional atom probe (3DAP) techniques.

Main Methods:

  • Utilized three-dimensional atom probe (3DAP) tomography.
  • Analyzed a model Fe-Ni-C alloy.
  • Studied a standard engineering steel (AISI4340).
  • Performed low-temperature aging (20-150°C).

Main Results:

  • Confirmed the presence of carbon-rich regions in both model and engineering steels.
  • Demonstrated average peak carbon concentrations up to 10at% in these regions.
  • Provided the first three-dimensional structural visualization of these carbon-rich regions.
  • Identified fine-scale faulting within the observed carbon-rich regions.

Conclusions:

  • Low-temperature aging of steels produces distinct carbon-rich regions.
  • These regions possess a unique three-dimensional structure with internal faults.
  • The findings challenge the conventional view solely focused on epsilon carbide formation.