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Oxford Reference. Publications Pages Publications Pages. Is the slope of fusion curve of water positive or negative? What is the fusion curve? What do the curve lines represent in the phase diagrams? Why do we need to know how do you interpret read phase diagrams? Previous Article What are elastic solids? Next Article What is a lancet window?
Back To Top. Forgot password? Don't have an account? Sign in via your Institution. You could not be signed in, please check and try again. Sign in with your library card Please enter your library card number. Search within work. Related Content In this work angular distortion eutectoid pattern phase diagram eutectic Ag. Pearlite is known for being tough and, when highly deformed, extremely strong.
Bainite is definitely not a phase but a microstructure of two phases austenite and cementite. The equilibrium microstructure of eutectoid steel obtained at room temperature is pearlite Fig.
The alpha phase is called ferrite. At the temperature of about C, austenite in many steels decomposed to lower bainite, a type of BCC iron ferrite with finely dispersed carbide cementite. Steels with pearlitic or near-pearlitic microstructure can be drawn into wires. Such wires, often bundled into ropes, are commercially used as piano wires , ropes for suspension bridges, and as steel cord for tire reinforcement.
It makes pearlite one of the strongest structural bulk materials on earth. According to many experienced gardeners, Styrofoam can be used instead of perlite. However, it must be the correct kind of Styrofoam, and there are serious environmental considerations to take into account. The Gibbs phase rule identifies the degree of freedom of a multiphase system that is in thermodynamic equilibrium.
It relates the number of intensive independent thermodynamic properties for each phase and the number of phases for a system. Through the use of the lever rule, one can also determine the amount of each phase present. Be aware that smaller grades of perlite, and in some cases cheap perlite with little quality control, can get dusty especially as you get to the bottom of a bag.
If you're sensitive to fine particles in the air, be sure to wear a dust mask and glasses when you're handling perlite.
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