Martensite is a very hard form of steel crystalline structure. It is named after German metallurgist Adolf Martens. By analogy the term can also refer to any crystal structure that is formed by diffusionless transformation. [1]

The different microscopic constituents of iron and steel which commonly occur are: 1. Ferrite. 2. Cementite. 3. Pearlite. 4. Martensite. 5. Austenite. 6. Troostite. 7. Sorbite. The other constituents comprise the three allotropic forms of nearly pure iron, graphite and slag.

Martensite is a very hard metastable structure with a body-centered tetragonal (BCT) crystal structure. Martensite is formed in steels when the cooling rate from austenite is at such a high rate that carbon atoms do not have time to diffuse out of the crystal structure in large enough quantities to form cementite (Fe3C).

The martensite is formed by rapid cooling (quenching) of austenite which traps carbon atoms that do not have time to diffuse out of the crystal structure. This martensitic reaction begins during cooling when the austenite reaches the martensite start temperature (Ms) and the parent austenite becomes mechanically unstable.

The meaning of MARTENSITE is the hard constituent that is the chief component of quenched steel.

Martensite remains of the greatest technological importance in steels where it can confer an outstanding combination of strength (> 3500 MPa) and toughness (> 200 MPa m1 2 ).

Martensite is a supersaturated solid solution of carbon trapped in a body-centered tetragonal structure and is metastable. From: Applied Welding Engineering (Third Edition), 2020

2024年10月24日 · What is Martensitic Stainless Steel? Martensite is a supersaturated solid solution of carbon in α-Fe. When steel is heated to a certain temperature to form austenite and then rapidly quenched, it results in a very hard crystalline microstructure known as martensite.

2024年8月8日 · Martensitic stainless steel is a type of stainless steel with a body-centered tetragonal (BCT) crystal structure covered by the 400 series alongside ferritic stainless steel. It is primarily composed of 12-18% chromium and 0.1-1.2% carbon.

2024年8月21日 · Austenite vs Martensite: Austenite and martensite are two fundamental microstructures in steel, each offering distinct physical and mechanical properties. Their formation, characteristics, and applications are crucial in various engineering fields, particularly in metallurgy and materials science.