Hardening mechanisms
Strengthening of metallic alloys Microstructure influence on plastic deformation

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Hardening mechanisms


Strengthening of metallic alloys Microstructure influence on plastic deformation

Authors : Jean-Hubert SCHMITT, Thierry IUNG

Publication date: December 10, 2016, Review date: November 25, 2020 | Lire en français

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3. Hardening mechanisms

Since plastic deformation occurs mainly through dislocations sliding on a crystalline plane, alloy hardening, i.e. the increase in yield strength, is achieved by creating obstacles to this displacement. The alloy's chemical composition and microstructure are adjusted to obtain the stress level required by the intended applications. Grain size, elements in solid solution and precipitates are the main levers for varying the yield strength of steels.

3.1 Grain size effect hardening

Numerous tests have demonstrated that the yield strength of a metal alloy increases with decreasing grain size.

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