What does martensite mean?
Martensite is a hard crystalline phase that forms when austenite in iron alloys, especially steel, is cooled rapidly enough to suppress ordinary diffusion. It is a supersaturated solid solution of carbon in iron and commonly has a characteristic lath- or plate-like microstructure. Its formation is central to heat treatment because it can give steel exceptional hardness and wear resistance. However, martensite can also make a material brittle, so it is often tempered after quenching to improve toughness. The term is more precise than hardened steel, which may describe the result of several different treatments and may contain other microstructural constituents as well. Martensite is therefore especially important in the study and manufacture of tool steels, blades, cutting instruments, and other products that require hardness, precise heat treatment, and controlled resistance to fracture.
nounA hard, metastable microstructural phase formed in iron alloys, especially steel, by the rapid cooling or quenching of austenite. It is valued for its hardness and strength but can make steel brittle.
- A hard, metastable phase of iron alloys, especially steel, produced by the diffusionless transformation of austenite during rapid cooling; it is typically supersaturated with carbon and has a lath- or plate-like microstructure.
"Quenching the alloy produced a structure consisting largely of martensite."
"The quenched tool steel developed a high proportion of martensite, increasing its hardness."
"Microscopic analysis revealed martensite plates running through the weld metal."
The plural is uncommon because martensite is normally used as a mass noun; it may be used when distinct martensite structures or forms are being discussed.
"The different martensites were distinguished by their characteristic morphologies."
Martensite is the hard phase created when steel is quenched—and it bears the name of the German metallurgist Adolf Martens.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does martensite come from?
The word comes from the surname Martens, borne by the German metallurgist Adolf Martens, whose work helped establish the transformations occurring in steel. The term martensite was applied to the hard product of rapid cooling, and the related adjective martensitic came to describe the corresponding transformation and microstructure. Later metallurgical vocabulary extended this family through martensitize and martensitization.
Related word forms
How martensite is actually used
This is a specialized metallurgical term used chiefly in technical and scientific contexts. It is normally treated as a mass noun, and alternative names such as martensitic steel are sometimes used when the emphasis is on the overall material rather than the phase alone.
Easily confused with martensite
Martensite is the hard crystalline phase itself, whereas martensitic is the adjective describing steel or a microstructure containing that phase.