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Which is the harder among them Cementite or Martensite?
Martensite
What are the limitation of iron iron-carbide diagram?
1) The nonequilibrium martensite does not appear on the diagram; and 2) The diagram provides no indication as to the time-temperature relationships for the formation of pearlite, bainite, and spheroidite, all of which are composed of the equilibrium ferrite and cementite phases.
What are some uses for martensite?
hardness of martensite is greater than bionite and fine pearlite.
Why martensite is so hard and brittle?
For two reasons: 1. martensite is bct structure which prevent the movement of dislocations. 2. martensite has higher carbon concentraton.
Difference between lath martensite and plate martensite?
Lath martensite and plate martensite are two morphologies of martensite formed during the rapid cooling of austenitic steel. Lath martensite appears as thin, elongated plates or laths and is typically found in low-carbon steels, resulting in a more ductile microstructure. In contrast, plate martensite consists of thicker, broader plates and is generally found in high-carbon steels, leading to higher hardness and brittleness. The differences in their formation and structure influence the mechanical properties of the steel they comprise.
Why hardenibility is not so high in plain carbon steels?
To harden a steel, it is heated to the austenitic region and then quenched to martensite. The rate at which the steel is quenched must be rapid enough to form martensite and not other microstructures (namely bainite, pearlite, or ferrite), which are not as hard. The cooling rate is a function of composition. Adding alloying elements to steel maintains hardenability at slower cooling rates, essentially shifting the TTT diagram. TTT diagram for steel in link below.
Is martensite formed when a steel is quenched?
Martensite transformation begins when austenite is cooled below a certain critical temperature, called the matrensite start temperature. As we go below the tmartensite start temperature, more and more martensite forms and complete transformation occurs only at a temperature called martensire finish temp. Formation of martensite require that the austenite phase must be cooled rapidly.
What is the meaning of the root word fec?
There is no root word fec. There is a root word fac-, meaning "make" that may appear as fect- in words such as "effect," or as fec- in "feckless."
When was FEC Strauss Trunnion Bascule Bridge created?
FEC Strauss Trunnion Bascule Bridge was created in 1890.
Why martensite is non equilibrium phase?
Martensite is considered a non-equilibrium phase because it forms rapidly during the quenching process, bypassing the slow diffusion-based transformations typical of equilibrium phases. Its formation involves a shear mechanism that occurs at low temperatures, resulting in a unique crystal structure that does not correspond to the equilibrium phase diagram. This rapid transformation does not allow for the atomic rearrangements required for equilibrium, leading to its metastable nature. Consequently, martensite possesses distinct mechanical properties compared to equilibrium phases like pearlite or bainite.
Why pearlite makes steel harder?
Because Martensite transformation is almost instantaneous, the Martensite has the identical composition of the parent phase. Formation of Martensite involves a transformation from a body-centered cubic structure to body-centered tetragonal structure. The large increase in volume that results creates a highly stressed structure.
What metals that conduct electricity are brittle?
Carbon Steel - Martensite
