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What are the objectives of heat treatment of metals?
Objectives of heat treatment-
Cause relief of internal stresses developed during cold working, welding, forging, casting etc. Harden and strengthen metals. Change grain size. Improve machinability. Soften metals for further working as in wire drawing or cold rolling. Improve toughness and ductility.
Increase, wear, heat and corrosion resistance of materials. Improve magnetic and electrical properties. Homogenise structure to remove coring or segregation. Spheroidize tiny particles, like those of Fe2C in steel, by diffusion.
Some of the precautions to be carried out when heating are - Metal/alloy has to be heated to a definite temperature. Holding at that sufficient temperature to allow change to occur. Tempering relieves residual stresses, improves ductility. Improve toughness, and reduces hardness increase % elongation.
The shape of d xy orbital will be: (1) Circular (2) Dumb-bell (3)Double dumb-bell (4) Trigonal Ans: Double dumb-bell
what points should be included in an assignment on van der waals forces
Iodine value - Analysis of oils and fats Iodine value of a oil or fat is a measure of its amount of unsaturation. It is proved as the number of grams of iodine taken up by 100
Uncertainty in position of a 0.25 g particle is 10 -5 . Uncertainty of velocity ( h = 6.6 x 10 -34 Js) is: (1) 1.2 x 10 34 (2) 2.1 x 10 -29 (3) 1.6 x 1
classify the reaction.Na2CO3(s) + SiO2(s) ? Na2SiO3(l) + CO2(g)
What is linear geometry The beryllium (Be) bears two groups, and thus has linear geometry. The H-Be-H bond angle is 180°.
the carbonate process
calculate the surface coverage obtained after exposure to a pressure of 10 torr of CO for 20s at 300K. sticking probability of CO is 0.9
describe the construction and the working of the calomel electrode
how hyperconjugation accued in branched molecules?
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