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Focused Improvement Class Notes_217962668-202505532-Class-Notes-High-Temperature-Materials

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VelTech Dr.RR & Dr.SR Technical University UNIT – I HIGH TEMPERATURE MATERIALS 1. CREEP : Creep may be defied as the slow and progressive deformation of a material with time under a constant stress at a temperature approximately above 0.4 T m, i.e.., the recrystallisation temperature of the material (Where Tm is the melting point of the metal or alloy in degrees Kelvin). Creep is function of temperature and time. Creep deformation is plastic in nature and occurs even though the acting stress is below the yield stress of the material. The rate of creep is very small but at higher temperatures it becomes very significant. Certain metals such as lead and tin which have low melting temperatures creep at room temperature. Creep behaviour is very much important when studying the behaviour of materials that are used in high temperature applications. For example steam plants, gas turbines, nuclear reactor, body of space crafts, tungsten filaments used in electric bulbs and radiator shields in furnaces are mede of molybdenum. Creep strength of a metal is usually defined by the limiting stress below which creep is so slow that it will not result in fracture within any finite length of time. Similarly Creep rupture strength or rupture strength of a material is the highest stress that a material can with stand for a given time without rupture. Creep limit may be defined as the maximum stress that will cause creep to occur at a rate not exceeding the specified deformation at a given ...
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