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Explain objectives of annealing? Discuss the various annealing processes? Is spheroidising different from annealing? Illustrate.
A slow cooling rate from eutectoid temperature yields course pearlite - a mixture of comparatively coarse crystals of ferrite and cementite. Such a slow cooling is known as annealing. Here, sufficient time is available for carbon in the austenite to diffuse and redistribute itself to 0.02% in ferrite and 6.67% in cementite. During annealing, effective transformation temperature is low, where rate of growth is rapid compared to rate of nucleation. Hence, spheroidising is obviously different from annealing.
Hofmann Method - Determination of Molecular Mass The method is applied to those substances that are not stable at their boiling points, but that may be volatilised with no deco
Maximum electrons in a d -orbital are: (1) 2 (2) 10 (3) 6 (4) 14 Ans: 10
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Thermosetting polymers - Classification of polymers These are the polymers which go through permanent modification on heating. They get firm and infusible on heating. They are
Q. Catalytic activity of metalloenzymes? Catalytic activity of metalloenzymes depends on the complex form in ability of a particular metal ion. One specific example is carbonic
Types of Substituents which Produce Directive Effect There are two kinds of substituents which generate directive effect are, (i) Those that direct the incoming group to ort
5 points on nickel plating
Hybridisation in Organic Compounds (1) The method of mixing atomic orbitals to form a set of new equivalent orbitals is known as hybridisation. There are three kinds of hybridi
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