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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.
Starch and its derivatives Starch is a white amorphous substance along with no taste or smell. While heated to a temperature among 200-250 o C it changes into dextrin. At large
The effects that temperature has on the equilibrium position of a reaction can also be explained by using Le Chtelier's Principle. Recall that in an exothermic reaction, heat i
Why bromoethane are insoluble Because only two layers form, two of the three substances are mutually soluble. we know that water and bromoethane are insoluble-they form two lay
Calculate the force constant of CF4 and SiF4 and compare their relative strengths with each other. The heats of formation of CF 4 and SiF 4 are -1222 kJmol -1 and -1615
Question: (a) Explain the precautions that should be taken by plant operators while handling chlorine gas used in disinfection of wastewater. (b) Show why disinfection of sl
which element have highest oxidation number and why?
what is inductomeric effect
Fine grain sizes are obtained by slow cooling
Anomalous behaviour of aluminium
Uses of Acetylene (a) Acetylene is utilized as an illuminant. (b) It is utilized for the production of oxy-acetylene flame. The high temperature of the flame is above. Is ut
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