martensite वाक्य
उदाहरण वाक्य
मोबाइल
- Martensite is not shown in the equilibrium phase diagram of the iron-carbon system because it is not an equilibrium phase.
- Often, after quenching, an iron or steel alloy will be excessively hard and brittle due to an overabundance of Martensite.
- The carbon equivalent is a measure of the tendency of the weld to form martensite on cooling and to suffer brittle fracture.
- Two common cases of this include cooling a liquid to form an amorphous solid, and cooling eutectoid austenite to form martensite.
- Steels that harden by aging are typically referred to as maraging steels, from a combination of the term " martensite aging ."
- The transformation is essentially time-independent with the phase fraction depending only the degree of cooling below the critical martensite start temperature.
- Further, it occurs without the diffusion of either substitutional or interstitial atoms and so martensite inherits the composition of the parent austenite.
- Tempered martensite gives steel good hardness and high toughness; used largely for medical tools ( scalpels, razors and internal clamps ).
- Equilibrium phases form by slow cooling rates that allow sufficient time for diffusion, whereas martensite is usually formed by very high cooling rates.
- In carbon steels, tempering alters the size and distribution of carbides in the martensite, forming a microstructure called " tempered martensite ".
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