What can be observed in hardening micro structure

Question

Accepted Answer

In hardening microstructure, one can observe changes in grain size, phase composition, and the presence of martensite.

Changes in grain size: Hardening can lead to a finer grain structure, resulting in improved mechanical properties.
Phase composition: Different phases may form during hardening, such as martensite, bainite, or retained austenite.
Presence of martensite: Martensite is a hard and brittle phase that forms during rapid cooling, indicating successful hardening.
Other microstructural features: Hardening can also lead to the formation of carbides, precipitates, or changes in dislocation density.

Accepted Answer

Martensite observed in hardening