What is it about?
The paper examines phase-like Cottrell atmospheres formed by carbon and hydrogen co-segregation at dislocations in the martensitic and ferritic components of a high-strength austenitic TRIP steel. Using thermal-desorption analysis, thermodynamic treatment, and atom-probe tomography, the authors identify hydrogen traps, estimate binding energies, and connect these features to strain aging and embrittlement.
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Why is it important?
The study is important because it clarifies how coupled carbon–hydrogen segregation at dislocations can alter hydrogen trapping and increase embrittlement susceptibility in steels. It provides a rigorous experimental and thermodynamic framework for evaluating strain aging, which is directly relevant to durability assessment and alloy design.
Perspectives
A useful next step would be to quantify how heat treatment, deformation history, and phase balance modify Cottrell carbohydride formation in different steel grades. It would also be valuable to combine depth-resolved desorption analysis with local microstructural mapping and in situ mechanical testing, so that hydrogen trapping can be linked more directly to crack initiation and loss of toughness.
Dr. Nikolai Morozov
Lomonosov Moscow State University
Read the Original
This page is a summary of: Cottrell Cosegregations of Carbon and Hydrogen: Characteristics and Role in the Strain Aging and Embrittlement of Steels, Journal of Surface Investigation X-ray Synchrotron and Neutron Techniques, December 2023, Pleiades Publishing Ltd,
DOI: 10.1134/s1027451023060393.
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