The low-symmetry structure of the martensite allows the material to absorb considerable plastic strain by re-orienting the distorted crystals of martensite according to the direction of the stress applied to it.

The low-symmetry structure of the martensite permits the material to absorb a substantial plastic strain by re-orienting the distorted crystals of martensite based on the direction of the stress applied to it.

The low-symmetry structure of the martensite allows the material to absorb considerable plastic strain by re-orienting the distorted crystals of martensite according to the direction of the stress applied to it.

In one embodiment, the steel composition includes a microstructure of one of the following: ferrite, martensite, tempered martensite, dual phase ferrite and martensite, and dual phase ferrite and tempered martensite.

The weld (70) is substantially free of martensite.

The size of martensite plate is relatively fine.

The microstructure in electron microscope is lath martensite and austenite-film existing among lath martensite.

(7) martensite transforms into tempered martensite (M = M)

The composite steel includes remaining austenite and HCP martensite.

MF: Temperature below which the entire sample is transformed into martensite (martensite finish)

The oil-tempered wire is one having a tempered martensite structure.

martensite

Hot-rolled high-strength micro-alloyed steel strip with improved HAZ-softening resistance having a microstructure comprising martensite, tempered martensite and/or bainite.

The structure of the disclosed steel is primarily tempered martensite.

Said steel pipe has a two-phase structure comprising a ferrite phase and a martensite phase, with the volume fraction of the martensite phase between 20% and 60%.