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.
hardness of martensite is greater than bionite and fine pearlite.
It is the state at which all the three phases i.e.,solid phase,liquid phase and vapor phase are in equilibrium.
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60*sqrt(C)+20 HRC
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.
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.
Martensite
A phase diagram of the equilibrium relationship between temperature, pressure, and composition in any system.
yes as it is in same phase
For the condition of phase equilibrium the free energy is a minimum, the system is completely stable meaning that over time the phase characteristics are constant. For metastability, the system is not at equilibrium, and there are very slight (and often imperceptible) changes of the phase characteristics with time.
hardness of martensite is greater than bionite and fine pearlite.
John Ettore Ricci has written: 'The phase rule and heterogeneous equilibrium' -- subject(s): Phase rule and equilibrium
For two reasons: 1. martensite is bct structure which prevent the movement of dislocations. 2. martensite has higher carbon concentraton.
Alec H. Reader has written: 'A study of copper-based alloys that undergo the thermoelastic martensite phase transition'
The non equilibrium model says that communities are constantly changing after being affected by disturbances.
It is the state at which all the three phases i.e.,solid phase,liquid phase and vapor phase are in equilibrium.